Research

Using ‘mathy math’ to understand how people regulate their emotions

Rachel Sauer — Fri, 17 Jan 2025 21:30:28 +0000

Using ‘mathy math’ to understand how people regulate their emotions Rachel Sauer Fri, 01/17/2025 - 14:30

Daniel Long

In a recent study, CU ��«��Ƶ’s Robert Moulder and colleagues find that individuals with trait neuroticism rarely modify how they respond to negative emotions

Emotions, like temperatures, go up and down. Yet everyone copes with these ups and downs in his or her own way. Some use the same emotion-regulation strategies over and over—read a book, take a walk, watch a movie—while others change which strategy they use depending on the situation.

Research scientist Robert Moulder of the ��«��Ƶ Institute of Cognitive Science, along with Katharine E. Daniel, Matthew W. Southward, Jennifer S. Cheavens and Steven M. Boker, wanted to know why: Why do some people frequently modify their regulation strategies? Why do others reuse the same strategies? And are there benefits to both approaches?

Institute of Cognitive Science research scientist Robert Moulder, a lecturer in the Department of Psychology and Neuroscience, notes that "that there are some times when it makes sense to become more adaptive" in regulating emotions.

Difficult questions, these, not least because they seek to identify patterns in what seem like random human behaviors. Which is why Moulder was particularly well-suited to the job of answering them. With a background in both mathematics and psychology, he uses chaos theory and nonlinear dynamics to understand human systems. “The way I like to describe it, I am like Ian Malcolm from Jurassic Park, but for people instead of dinosaurs,” he jokes. “I do the ‘mathy math’ behind how psych works.”

Thanks to Moulder’s “mathy math,” he and his fellow researchers were able to reveal a key distinction between those who rarely change up their emotion-regulation strategies and those who do so often: trait neuroticism.

Trait vs. state

Neuroticism, Moulder says, refers to “someone's overall tendency to engage in and ruminate on negative emotions like getting angry, getting upset, being distrustful. You can think about it as the propensity of an individual to experience and act upon negative emotions.”

There are two categories of neuroticism: state neuroticism and trait neuroticism, the differences between which Moulder illustrates with an analogy to extroversion.

“A state personality would be, say, how extroverted you are right now, or how extroverted you are in two or three days,” he says. “Have you ever gone to a party and felt really engaged but afterwards felt dead? During that party your extroversion was higher than it normally would be, and afterwards, it was probably a little lower.”

Trait extroversion, on the other hand, takes the average of those individual moments over time. “It's kind of like your stable equilibrium,” says Moulder. “If you were going to describe to someone how extroverted you are, you'd be talking about your trait extroversion.”

The same thing goes for neuroticism. One person may have a high degree of neuroticism at any given moment but a low degree overall—high state, low trait—whereas another person may be exactly the opposite.

What Moulder and his colleagues found was that subjects with high levels of trait neuroticism tend not to experiment with their regulation strategies. “That means someone who is very high in neuroticism will consistently use the same tools over and over again, whether they’re working or not.”

A new mathematical model

Moulder and his colleagues arrived at these findings with the help of transition matrices, an analytical tool Moulder and Daniel developed in a previous paper.

Examples of transition matrices developed by CU ��«��Ƶ scientist Robert Moulder and his research colleagues.

“Why people do the things they do after a negative event has thousands of components,” Moulder says. “There was not a good method for measuring that. So, we made one.”

Transition matrices are rectangular grids of rows and columns that enable study subjects to keep track of which emotion-regulation strategies they use and when they use them.

A subject who got into an argument with her boss at noon and then took a walk, for example, would put a “1” in the box in her matrix associated with taking a walk. If she received an angry email from her boss an hour later and chose this time to call a friend, she would put a “1” in the box associated with that regulation strategy.

“If someone used the exact same strategy all the time, you would just see one number in the matrix, and all the rest of the matrix would be ‘0,’” Moulder says, whereas someone who constantly switched from one regulation strategy to the next would have numbers all over his or her matrix.

These transition matrices provide two key metrics, Moulder explains: stability and spread. Higher stability means fewer regulation strategies; higher spread, more strategies. Subjects with high levels of trait neuroticism are therefore likely to have high stability.

Just-in-time interventions

With this information about their own emotion-regulation behaviors, subjects can see which strategies they use and reuse; they get a snapshot of their own stability and spread. If they find they’re putting the same strategies on repeat, they can decide to change things up—play pickleball instead of binge-eating pickles, for instance.

“There are some times when it makes sense to choose the same strategy,” Moulder says, “but we know from prior research that there are some times when it makes sense to become more adaptive—to increase, to spread, to try other things.”

Moulder adds that the knowledge gleaned from transition matrices can also be turned toward potentially more effective approaches to emotion regulation. He and Daniel call one idea “just-in-time interventions.”

“If we are, let’s say, giving individuals telehealth, which is a really big space right now for therapy, we want to do something called just-in-time interventions,” he says. By understanding a person’s regulation practices, “we can say to that person, ‘Hey, you keep going to drink almost every time something negative happens. Maybe this time go read a book or a call a friend.’ We can offer alternatives that research shows will lead to better outcomes.”

The power of such interventions lies in their precision. They’re based not purely on statistics, Moulder says, but on “person-specific analysis, which we can use to give people personalized messaging that would ideally best help them in the long run.”

There’s no guarantee that switching strategies will bring the desired outcome, Moulder admits, but experimentation is part of the process. “We’re never going to know what works until we try.”

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In a recent study, CU ��«��Ƶ’s Robert Moulder and colleagues find that individuals with trait neuroticism rarely modify how they respond to negative emotions.

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Exploring selfish incentives for pursuing climate policy

Rachel Sauer — Tue, 14 Jan 2025 01:02:56 +0000

Exploring selfish incentives for pursuing climate policy Rachel Sauer Mon, 01/13/2025 - 18:02

Bradley Worrell

CU ��«��Ƶ economist Alessandro Peri makes the case that empowering the young can meaningfully affect climate policy and climate outcomes

The consensus opinion in previous research—that future generations are the major beneficiaries of proactive climate policies—tends to emphasize the importance of intergenerational altruism. However, that perspective largely ignores the idea that selfish incentives of current young and old generations can be an important driver to undertake climate policy, says Alessandro Peri, assistant professor in the ��«��Ƶ Department of Economics.

Recent studies indicate that peak global warming occurs within a decade of emissions. Thus, current climate policy could benefit young generations later in their lifetimes, says Peri, a macroeconomist whose research focus includes computational and environmental economics.

CU ��«��Ƶ economist Alessandro Peri argues that selfish incentives of current young and old generations can be an important driver to undertake climate policy.

Meanwhile, climate policy may benefit the current old generations by reducing the damages associated with climate change and therefore increasing the value of their assets.

In the paper, “Selfish Incentives for Climate Policy: Empower the Young!” recently published in the Journal of the Association of Environmental and Resource Economists, Peri and his two co-authors advanced what they say is the first study to examine the direction and magnitude of the selfish incentives of young and old to undertake climate policy.

In the economic model Peri and his co-authors developed, the younger generation (ranging from infants to those aged 35) and the older generation are both part of solutions addressing the climate crisis. The older generation tends to control most of the world’s physical assets, such as factories, he notes.

“What we found after we analyzed, theoretically and quantitively, this question of selfish incentives for climate policy is that incentives of the younger generation can be an important driver for climate policy to address the challenge of global warming,” says Peri.

Abatement measures related to reduced carbon emissions can affect the asset owners’ wealth and, accordingly, the old generation’s selfish incentives to support or oppose climate policy, but the effect is quantitatively small. Hence, Peri says, the exhortation in the title: “Empower the Young!”

When climate policy is a win-win

To explore the selfish incentives for climate policy, the model Peri and his co-authors developed uses a two-generation overlapping generations model, rather than the more common infinitely lived agent model. Peri says the two-generation structure permits a clear distinction between the two types of self-interest: the younger generation’s concern for its future consumption and the older generation’s desire to protect its wealth.

For the incentives of the current young and old generations to undertake climate policy to be aligned (a win-win situation), climate policy must increase the value of the assets owned by the old generations.

“Think about it like if you own a house in front of a lake,” Peri explains. “You don't really like the lake, but someone else decides to clean the lake. Well, the value of your house close to the lake is going to increase; you’re going to benefit indirectly from the cleaning of the environment on your wealth. The (increase) of this price allows the older generations to engage in climate policy and be happy about climate policy.”

For this to happen, Peri and his co-authors created an economic model that uses endogenous asset prices, relaxing the assumption of fixed asset price adopted by most models in the climate literature.

As wealth is transferred from the older generation to the younger one, for the asset price to increase it has to be the case that current young generations want to save more.

“With the new evidence that has shown that emissions today will have an impact in our lifetime in terms of global warming, we wanted to add our new part … looking at how selfish incentives can help mitigate this great human challenge," says CU ��«��Ƶ researcher Alessandro Peri.

“They (the young) are willing to consume a little bit less today and save for tomorrow, so that they can consume more tomorrow,” as a result of climate policy, Peri says. “And what we show is that for that to happen, it means the young have to have a high elasticity of intertemporal substitution, which is just a fancy way of saying that they are willing to transfer more consumption from today to tomorrow” as a result of the effect of climate policy on the value of consumption over time.

Still, based upon the results of computational research done for the research paper, Peri says he and his co-authors determined that selfish incentives for the younger generation proved more quantitatively important for climate policy than those of the old generation.

Goal to spur further research and discussions

Peri says he hopes the economic model for addressing climate change that he and his co-authors created will complement existing research on economic policy related to climate change, including those that rely on altruistic motivations. He says he does not expect lawmakers to adopt the model as policy, but he hopes the paper will spur further research by economists and prompt discussions among policymakers.

Discussions about combatting climate change are particularly timely now, Peri says, given that in 2024 the temperature of the earth reached 1.5 degrees Celsius hotter than in the pre-industrial era—before heat-trapping fossil fuels began accumulating in the atmosphere. The Paris Climate Accords, signed by representatives for numerous countries in 2016, aims to keep warming below that level when looking over multiple years.

“This is the great challenge we are facing nowadays, with the announcement in 2024 that we reached 1.5 degrees Celsius above pre-industrial times. So, it’s been the hottest year that we’ve observed since the pre-industrial era,” Peri says. “With the new evidence that has shown that emissions today will have an impact in our lifetime in terms of global warming, we wanted to add our new part … looking at how selfish incentives can help mitigate this great human challenge.”

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CU ��«��Ƶ economist Alessandro Peri makes the case that empowering the young can meaningfully affect climate policy and climate outcomes.

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Thank bacteria for your innate immune responses to viruses

Rachel Sauer — Fri, 10 Jan 2025 18:43:14 +0000

Thank bacteria for your innate immune responses to viruses Rachel Sauer Fri, 01/10/2025 - 11:43

Blake Puscher

��«��Ƶ scientists review the evidence for the bacterial origin of eukaryotic immune pathways

Scientists generally agree that eukaryotes, the domain of life whose cells contain nuclei and that includes almost all multicellular organisms, originated from a process involving the symbiotic union of two prokaryotes: an archaeon and a bacterium. It is unsurprising, then, that prokaryotes (single-celled organisms lacking nuclei and organelles) share many basic features—such as DNA genomes, cell membranes and cytoplasm—with eukaryotes; they developed these traits first and passed them down.

However, if the situation is this (relatively) simple, then the different kingdoms of eukaryotic life—animals, plants and fungi—should all have some variation of the same essential traits.

CU ��«��Ƶ researchers Hannah Ledvina (left) and Aaron Whiteley reviewed research that suggested a phenomenon known as horizontal gene transfer in eukaryotes.

By reviewing the research on this subject, two ��«��Ƶ scientists have demonstrated that this is not the case with respect to elements of the innate immune system that come from bacteria. Rather, some of the eukaryotic kingdoms have these elements while others do not. This is suggestive of a more obscure phenomenon known as horizontal gene transfer.

As authors of a recently published review article, Aaron Whiteley, the principal investigator of the Aaron Whiteley Lab and an assistant professor of biochemistry, and postdoctoral fellow Hannah Ledvina were not involved in most of the research used to draw this conclusion, and were not the first to come to it, but write to summarize the state of the field and provide clarity by aggregating sources.

Categories of immune system

There are two categories of immune systems: innate and adaptive. Both exist within an individual because they serve distinct purposes. The adaptive immune system is more effective at eliminating viruses than the innate immune system, Whiteley says, but the innate immune system also plays an important role.

“We all know that you start feeling sick maybe one or two days after you were exposed to most viruses,” he says. “In the beginning, part of the reason you feel sick is because your first line of defense, the innate immune system, is trying to buy as much time as possible for the adaptive immune system.”

It is hard to successfully fight a virus without the antibodies and other virus-specific cells created by the adaptive immune system, Whiteley explains, but the generalized response of the innate immune system is necessary to slow the progression of disease during the time it takes for the adaptive immune system to respond.

By studying the innate immune system, scientists have found connections between the immune systems of bacteria and those of humans.

“We only started sequencing large numbers of genomes about 20 years ago,” Whiteley says, “and before we sequenced any genome, it was very hard to compare two organisms.” When some genomes became available, rudimentary comparisons were possible, “but as of maybe 10 years ago, our detection techniques for similarities of genes have skyrocketed,” and this has made comparisons like the ones in Whiteley and Ledvina’s review possible in combination with the sequencing of many more genomes.

Conserved immune pathways

“What we’ve been finding is the way that bacteria stop phages is very similar to the ways that humans fight off their pathogens,” Ledvina says. “The same proteins, as well as the same types of signaling pathways, are being used.”

"We know that the world of the immune system is so much bigger than viruses. Our immune system controls cancer, our immune system is important for wound healing and our immune system also restricts bacterial pathogens.”

Ledvina and Whiteley highlight four such types of signaling pathways of the innate immune system that are conserved between bacteria and either humans or humans and plants: cGAS-STING, NACHT and STAND NTPases, viperins and TIR.

A signaling pathway is a series of chemical reactions between a group of molecules in a cell that collectively control a cell function. The two basic elements of a signaling pathway are sensor and effector proteins: sensors detect the presence of a virus or phage and start the signaling cascade that ends with the activation of an effector, which is responsible for some form of immune response.

In the first type of signaling pathway, bacteria use the same sensor and effector proteins, cGAS and STING, to respond to phages as humans use to respond to DNA viruses (e.g., smallpox-like viruses).

In the second type of signaling pathway, Whiteley says, bacteria sometimes use the exact same protein domain, NACHT, as humans. NACHT is a subtype of STAND NTPase, a class of protein. In other cases, bacteria use different STAND NTPase subtypes, and plants use this protein class too.

A third type of signaling pathway found in eukaryotes and bacteria uses an effector protein called viperin. Similarly, in the fourth type of signaling pathway, the signaling domain TIR is used by plants, humans and bacteria.

Horizontal gene transfer

The relationships between the immune systems of humans and bacteria are especially interesting, Whiteley says, because these four pathways are likely to have been passed to eukaryotes by horizontal rather than vertical gene transfer.

Eukaryotes have many genetic similarities to bacteria, including in terms of the immune system. This, Whiteley explains, is because “things like the mitochondria, which is a really important organelle within all our cells, look like they came from a bacterium that started living inside the cell and then became a permanent resident.”

In other words, bacteria are ancestors of eukaryotes, and therefore many of the genes from bacteria were passed down to eukaryotes through vertical gene transfer, which is the transfer of genes from ancestors to progeny. However, shared genes can also be transferred horizontally.

Bacteria are ancestors of eukaryotes, and therefore many of the genes from bacteria were passed down to eukaryotes through vertical gene transfer, which is the transfer of genes from ancestors to progeny, explains CU ��«��Ƶ researcher Aaron Whiteley. (Illustration: Shutterstock)

The exact mechanism for this type of transfer is unknown, Whiteley says, but the formation of mitochondria may provide a model: “You can imagine something similar, where a bacterium went into a cell, only rather than taking up residence, it broke open and released its genome. DNA is DNA, so it can be incorporated from exotic sources, albeit rarely.”

It is hard to be certain about this because of how long ago it would have happened, according to Whiteley. Eukaryotes lacking a given immune pathway may have used it at one point but then lost it through an evolutionary process like stabilizing selection, which removes traits that are no longer useful in order to free up resources (the classic example being fish or other animals that lose their eyes because they live in dark places like caves).

There is, however, significant evidence for horizontal gene transfer, Whiteley says. “If you find that a gene is in animals, but it's not in all the cousins of animals like plants or fungi,” as was the case with these immune pathways, “then the simplest explanation is that it was transferred in.”

This is all to say that these pathways evolved in bacteria after the creation of the first eukaryotes and were introduced to some of the eukaryotic kingdoms after the last eukaryotic common ancestor, which was about 2 billion years ago.

That kind of interaction is important because it’s how antibiotic resistance forms, Whiteley explains. “Bacteria in the hospital talk to other bacteria and they swap genes. We think about that all the time between bacteria, but we rarely think about it between different domains of life, like going from bacteria into, in this case, some ancestor of a human cell from a billion years ago, and that has real impacts.”

Immune evasion and drug development

According to Ledvina, there are at least four different ways for viruses to prevent immune systems from sensing and inhibiting them. These include preventing critical enzymes from functioning, destroying the products of such enzymes, blocking protein sensors by mimicking whatever activates them, and physically shielding the features that immune systems look for to identify viruses. This is true of both the viruses that make us sick and the viruses that infect bacteria.

One question that people always ask, Whiteley says, is “if our immune system is so great, why are we still getting sick? And it's because viruses find every way possible to maintain the upper hand.

“The wild thing is, I guess because the immune system of humans and bacteria looks so similar, the viruses of humans and bacteria have come up with shared strategies for that immune evasion. So, we can discover things in bacteria, but then go to human viruses and understand, are they also using this mimic strategy? And if so, that becomes a great antiviral strategy for drug development.”

Bacteria are particularly useful for testing, he explains, because they grow fast and because scientists have already developed genetic and biochemical tools with which to study them. These advantages and the similarities between bacterial and human immune systems mean that bacteria could inspire drugs to treat human viruses.

However, Whiteley says, “we know that the world of the immune system is so much bigger than viruses. Our immune system controls cancer, our immune system is important for wound healing and our immune system also restricts bacterial pathogens.”

This is what makes Hannah Ledvina’s research on ubiquitin-like proteins interesting. As demonstrated in a paper she worked on, bacteria have ubiquitin pathways resembling those in eukaryotes, and ubiquitin is broadly important in humans according to an article in Cell Death & Differentiation, such that its failure is associated with the development of cancer, immune disorders, and neurodegenerative diseases, among other things. As that article points out, this means there may be new therapeutic opportunities within the ubiquitin system.

“I think with Hannah's work,” Whiteley says, “we've shown the sky's the limit in terms of understanding the ways bacteria defend themselves, and then hopefully informing the way that human cells defend themselves.”

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��«��Ƶ scientists review the evidence for the bacterial origin of eukaryotic immune pathways.

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‘She remains a touchstone’

Rachel Sauer — Thu, 09 Jan 2025 18:42:08 +0000

‘She remains a touchstone’ Rachel Sauer Thu, 01/09/2025 - 11:42

Clay Bonnyman Evans

CU ��«��Ƶ anthropologist says ‘Lucy’ is pivotal to the science of human origins a half-century after her discovery

A half-century after her discovery in Ethiopia, the 3.2-million-year-old hominin popularly known as “Lucy” remains a critical touchstone in humanity’s understanding of its origins.

Matt Sponheimer, a CU ��«��Ƶ professor of anthropology, notes that the Australopithecus afarensis skeleton known as Lucy is "instantly recognizable in a world awash in fossils."

Officially labeled A.L.288-1, Lucy extended humanity’s ancient history by almost a million years, and she remains a standard to which decades of discoveries have been compared.

“Lucy is instantly recognizable in a world awash in fossils,” says Matt Sponheimer, a ��«��Ƶ professor of anthropology whose research focuses on the ecology of early hominins from the African continent. “She is in many ways a touchstone.”

American anthropologist Donald Johanson first noticed what appeared to be a human-like elbow while out looking for fossils with a graduate student on Nov. 24, 1974, at Afar, Ethiopia, and soon spied multiple fragments nearby. He and his team eventually unearthed 47 remarkably well-preserved bones—about 40% of a complete skeleton—including skull fragments, a mandible with teeth, ribs and pieces of an arm, leg, pelvis and spine.

Lucy was eventually revealed to be an early hominin—a member of a hominid subfamily that includes humans, chimps and bonobos—with a brain about one-third to one-fourth the size of modern humans who walked upright. Research suggests that Lucy’s kind thrived in a wide range of ecosystems, from woodlands to grasslands and riverine forests.

Sharing characteristics of both Australopithecus africanus, a previously discovered hominin from South Africa, and chimpanzees, Lucy was assigned to a new species, Australopithecus afarensis.

Lucy's well-preserved skeleton, comprising about 40% of her body, provided unprecedented insights into early hominin anatomy.

A singular discovery

When Lucy was discovered, she was “singular,” Sponheimer says. But subsequent research has uncovered hundreds of fossils from Australopithecus afarensis as well as other distinct hominin species and footprints of bipedal hominins preserved in volcanic ash.

A sculptural reconstruction of the hominin known as Lucy by artist Elisabeth Daynes. (Photo: Elisabeth Daynes)

Despite fifty years of major discoveries, anthropological consensus still considers Lucy a likely ancestor to modern humans.

Beyond her monumental significance to the scientific understanding of human origins, Lucy has played a key role in educating people about evolution and anthropology.

Her fame and wide recognition have helped spur generations of children’s and students’ interest in the field. Johanson’s best-selling 1981 book, Lucy: The Beginnings of Humankind, is still widely read by popular audiences.

“A huge number of anthropologists were inspired by that book,” Sponheimer says. “When I read it, I remember thinking, ‘Wow, this is the kind of thing I would like to pursue.’”

Years later, he considers not just anthropology but also research in the broader humanities, arts and sciences to be critical to human knowledge and flourishing. He cautions against the unforeseen consequences of American culture’s gradual shift to a more instrumental, economic view of the world.

“Exploring is part of what it means to be human. What’s more human than experiencing wonder and trying to understand the world around us? Tens of thousands of years of archaeology teaches us that. Channeling exploration into a narrow economic field of vision misses the point, I think, and is ultimately self-defeating on the economic front,” he says.

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CU ��«��Ƶ anthropologist says ‘Lucy’ is pivotal to the science of human origins a half-century after her discovery.

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Top image: model of a Australopithecus afarensis skull (Photo: iStock)

Rebuilding lives after the headlines fade

Rachel Sauer — Wed, 08 Jan 2025 20:03:03 +0000

Rebuilding lives after the headlines fade Rachel Sauer Wed, 01/08/2025 - 13:03

Cody DeBos

CU ��«��Ƶ researcher Lori Peek emphasizes that the impact of natural disasters can be multiplicative

Six-year-old Samantha’s new ballet slippers, ready for her first dance class, sat untouched as Hurricane Katrina tore through New Orleans in 2005. Five years later, another disaster—the Deepwater Horizon oil spill—compounded her family’s challenges.

“Losing everything and having to start over, that has happened to me so many times, it just feels like I lost my childhood,” she reflected when talking with Lori Peek, ��«��Ƶ Department of Sociology professor.

CU ��«��Ƶ researcher Lori Peek (center) with participants in the Gulf Coast-based youth empowerment program called SHOREline, which she co-created and that was designed to make fundamental changes in the lives of youth and their communities, including reducing inequality before and after natural disasters.

Stories like Samantha’s illuminate a deeper truth: The harm caused by disasters doesn’t fade when the news cycle moves on. Hers is one of many stories Peek has heard while conducting research for more than a decade in the Gulf Coast region.

Peek, who also serves as director of CU ��«��Ƶ’s Natural Hazards Center, has dedicated her career to understanding how disasters shape the lives of children and families.

Out of the spotlight, families across the country are fighting against systemic challenges, emotional tolls and inadequate support to get their lives back on track. Peek’s research focuses not just on immediate devastation, but also on the long road to recovery that so many disaster survivors must travel.

The compounding effects of disaster

Most natural hazards leave visible scars when they sweep across a landscape—flooded homes, shattered schools and shuttered businesses. Peek’s ethnographic approach reveals the experiences of people and the hidden struggles they face while navigating the aftermath of major disasters.

Her long-term, collaborative research along the Gulf Coast, recently highlighted in a Journal of Child and Family Studies article titled “Adverse Effects of the Deepwater Horizon Oil Spill Amid Cumulative Disasters: A Qualitative Analysis of the Experiences of Children and Families,” underscores how compounded disasters can upend entire communities for decades.

“One disaster can obviously wreak havoc on a young person’s life,” Peek explains. “But now we are living in an age of extremes, where families and communities may be affected by multiple disasters in a relatively short period.

“The impact of these events isn’t additive—it’s multiplicative.”

Peek’s longitudinal study of Gulf Coast children illustrated this phenomenon. After Hurricane Katrina, countless families were just beginning to rebuild their lives when the Deepwater Horizon spill once again devastated local economies and ecosystems.

Children like Samantha, Peek notes, are particularly vulnerable in such contexts. They absorb not only the immediate chaos of a disaster but also the long-term stress of financial insecurity, familial upheaval, displacement and disrupted support systems.

Peek and her co-authors use the term “toxic stress” to describe this chronic strain. Its effects can lead to serious health and developmental challenges that persist for years—or a lifetime.

Lori Peek, a CU ��«��Ƶ professor of sociology and director of the Natural Hazards Center, conducts fieldwork with a child after Hurricane Katrina; the child was later affected by the BP Deepwater Horizon oil spill as well.

Samantha’s story isn’t isolated. Rather, it’s one of many narratives underscoring the profound sense of loss that lingers long after the immediate crisis concludes.

Peek believes these stories must be heard and addressed if communities and families are to build resilience against future disasters.

“Until relatively recently, the recovery phase of disaster was the most understudied,” she says. “That started to change after Katrina. But now we are in a new era, where disasters are becoming more severe and intense, and communities are being hit more often.”

This not only makes studying disasters more complicated, but it also can lead to recovery resources being averted just when they are needed most, she adds.

The role of support systems

Peek’s research emphasizes that recovering from a disaster cannot be an individual journey. Robust support systems are necessary.

“For children to recover from disasters, they need support from their family members, peers, teachers and broader community. Strong institutions—such as stable housing, quality health care and safe schools—are equally crucial,” she says.

Yet many children lack these foundational supports even before disaster strikes, Peek notes. When a catastrophe does occur, it magnifies pre-existing inequalities, and vulnerable families often find themselves in even more precarious situations.

On the bright side, Peek says, “disasters can be catalysts for change. But only if recovery funding is targeted toward the people and places that need it most.”

A call to action

Peek’s findings highlight the imperative to ensure that recovery efforts reduce inequalities both before and after disasters occur. She co-created a Gulf Coast-based youth empowerment program called SHOREline that was designed to make such fundamental changes in the lives of youth and their communities.

By bringing together policymakers, educators and community leaders, Peek aims to create frameworks that protect communities before the next disaster strikes.

She also emphasizes the importance of not just studying disaster recovery but acting before communities are devastated by the next hurricane, flood or wildfire. To achieve this, Peek advocates for policies that prioritize equity and resilience, emphasizing the need for long-term planning and cross-sector collaboration.

"One disaster can obviously wreak havoc on a young person’s life. But now we are living in an age of extremes, where families and communities may be affected by multiple disasters in a relatively short period."

“Recovery frameworks are still designed as if a single disaster is affecting a place, and as if recovery is occurring in a neat, stepwise fashion. That’s simply not the reality.”

Through her work, Peek hopes to reshape how communities and policymakers approach disaster recovery. As Samantha’s story reminds us, disasters leave marks that linger far beyond the headlines. The disruption of her childhood dreams reveals a profound need for systems that protect society’s most vulnerable.

With the right support, Peek notes, children like Samantha can regain their footing and even thrive in the aftermath of disaster.

Peek’s vision for the future—one where no child’s dreams are washed away by hurricanes or tarnished by oil spills— enters on resilient communities safeguarded by robust support systems and programs that address systemic issues rooted in poverty and racial inequality.

“If we can use the small windows for change opened by disasters to make progress in reducing—rather than exacerbating—inequality and suffering, that would be a real win for current and future generations.”

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CU ��«��Ƶ researcher Lori Peek emphasizes that the impact of natural disasters can be multiplicative.

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Top image: Lori Peek with participants in the SHOREline program

Historian still making a strong case for Black Majority

Rachel Sauer — Mon, 06 Jan 2025 22:53:30 +0000

Historian still making a strong case for Black Majority Rachel Sauer Mon, 01/06/2025 - 15:53

Bradley Worrell

CU Adjunct Professor Peter H. Wood’s seminal 1974 book on race, rice and rebellion in Colonial America recently celebrated its 50th anniversary with an updated version

If Peter H. Wood wants to stump some University of Colorado history majors about early American history, he’ll ask them which of the original 13 colonies was the wealthiest before the American Revolution and also had an African American majority at the time.

“Often, they will see it as a trick question. Some might guess New Jersey or New York or Connecticut, so most people have no idea of the correct answer, which is South Carolina,” says Wood, a former Rhodes Scholar and a Duke University emeritus professor. He came to the CU ��«��Ƶ Department of History as an adjunct professor in 2012, when his wife, Distinguished Professor Emerita Elizabeth Fenn, joined the department.

Peter H. Wood has been an associate professor at CU ��«��Ƶ for more than a dozen years, following a lengthy career teaching American history at Duke University.

South Carolina colonial history is a topic with which Wood is intimately familiar, having written the book Black Majority: Race, Rice and Rebellion in South Carolina, which was first published in 1974 and has been described as one of the most influential books on the history of the American South of the past 50 years. W. W. Norton published a 50th anniversary edition of the book in 2024.

Recently, Wood spoke with Colorado Arts and Sciences Magazine about how he first brought the story of colonial South Carolina to light, reflecting on how the book was received at the time and why this part of history remains relevant today. His responses have been lightly edited for style and condensed for clarity.

Question: How did you become aware of this story of colonial South Carolina, which was unfamiliar to many Americans in 1974 and perhaps still is today?

Wood: I knew when I was an undergraduate that I wanted to study early American history. After a two-year stint at Oxford in the mid-1960s, I came back to Harvard for graduate school.

At that time, the Civil Rights Movement was going on. I’d been very interested in those events, as most of my generation was, and I wanted to see how I could put together my interest in interracial problems with my interest in early American history.

What I found was that early American history was very New England-oriented in those days. Ivy League schools were cranking out people writing about the Puritans, and when they wrote about the South, they would mainly write about Virginia. They talked about Jefferson and Washington. South Carolina had hardly been explored at all. There are only 13 British mainland colonies, after all, so to find that one of them had scarcely been studied was exciting.

Specifically, I was motivated by the Detroit riot in 1967, watching it unfold on television in the summer of 1967. Roger Mudd, the old CBS reporter, was flying over Detroit in a helicopter the way he’d been flying over Vietnam. He was saying, ‘I don’t know what’s going on down there.’ I realized that he was supposed to be explaining it to us, but he didn’t really have a very good feel for it himself. No white reporters did.

And the very next morning I went into Widener Library at Harvard and started looking at colonial history books to see if any of them covered Black history in the very early period … and South Carolina was completely blank. So, that was what set me going.

Question: If there wasn’t any significant scholarship about South Carolina prior to the American Revolution, particularly about African Americans living there, how did you conduct research for your book?

Wood: I went to the South Carolina State Archives in Columbia, not knowing what I would be able to find. I understood that if I did find materials, they would be written by the white colonists … because enslaved African Americans were not allowed to read and write. There wasn’t going to be anybody who was African American keeping a diary.

But what I did find was that the records were abundant. That’s partly because these enslaved people were being treated as property; they had a financial value. So, when I would open a book, there would be nothing in the index under ‘Negroes’ (that was the word used in those days). But I would look through the book itself and there were all kinds of references to them. They just hadn’t been indexed, because they weren’t considered important.

At every turn, there was more material than I expected, and often dealing with significant issues. …

And when you’re researching early African American history, you learn to read those documents critically. The silver lining of that sort of difficult research is that it forces you to be interdisciplinary and to use any approach you can.

Black Majority by CU Associate Professor Peter H. Wood was updated for its 50th anniversary in 2024. First published in 1974, the book broke new ground in showing how important slaves were to the South Carolina economy in Colonial times.

So, I ended up using some linguistics and some medical history (about malaria) and especially some agricultural history. Most people back then—and most Americans still today—don’t realize that the key product in South Carolina was rice. I argued successfully and for the first time in this book that it seemed to have originated with the enslaved Africans. The gist of the book is that these people were not unskilled labor; they were skilled and knowledgeable labor, and it was a West African product (rice) that made South Carolina the richest of the 13 colonies.

Question: With regard to Black Majority, you made the statement, ‘Demography matters.’ What do you mean by that?

Wood: I realized early on that demography was a very radical tool in the sense that it obliges you, or allows you, to treat everybody equally. In other words, to be a good demographer, you have to count everybody: Men, women and children, Black and white, gay and straight—everybody counts equally. As a born egalitarian, that was appealing, especially in a period where there were lots of radical ideas bouncing around that I was a little leery of.

But demography seems very straightforward, as in: All I have to do is count people. So, the very title of the book, Black Majority, is a demographic statement. It’s not saying, ‘These people are good or bad’ or anything else. It’s just saying, ‘Here they are.’ It becomes what I call a Rorschach test, meaning it’s up to the reader as to what they want to make out of these basic facts. …

The book—especially in those days—was particularly exciting for young African Americans, because they’d been told they didn’t have any history, or that it was inaccessible.

Remember, this was even before Alex Haley had published Roots. I actually met Alex while he was working on his book, because I was one of the only people he could find who was interested in slavery before the American Revolution. Most of the people who were studying Black history—which was only a very small, emerging field in those days—were either studying modern-day Civil Rights activities and Jim Crow activities, or maybe the Civil War and antebellum cotton plantations.

Question: You initially undertook your research on this topic to write your PhD dissertation. At what point in the process did you think your findings could make for a good, informative book?

Wood: Very early on, I thought I wanted to write a book. I mean, I wanted to be able to publish something and I wanted to start at the beginning. … If I could go all the way back to 1670, when this colony began, and find records, and tell the story moving forward—instead of going backwards from the Civil Rights movement—I wanted to do that.

If I could write a book about that, then it would show lots of other people that they could write a book about Blacks in 18th-century Georgia or 19th-century Alabama, for example. All of those topics had seemed off limits at the time.

So, I was going to start at the beginning and move forward and see how far I had to go to get a book. I thought, ‘I’ll probably have to go up to 1820,’ but by the time I got to 1740, by the time I got through the Stono Rebellion—which was the largest rebellion in Colonial North America, in 1739, and it was unknown to people—I had enough for a book.

I had enough (material) for a dissertation so I could get my degree, but I also had enough for a book. And, luckily for me, it was just at the time when there was a lot of pressure on universities to create Black Studies programs, in the late 1960s and early 1970s.

That put a lot of pressure on New York publishers to find books about Black history. And so, Alfred Knopf in New York took the book and gave me a contract within two weeks. I was very lucky in that regard: That was a moment where it was just dawning on everybody that, ‘My goodness! There’s a huge area here where we have not shone a searchlight.’ …

I'll tell you a funny story. At Knopf, they said, ‘You should go talk to our publicity director,’ because they were excited about this book. I walked into her office, and she was this burly, blonde advertising woman. Her face just dropped. She said, ‘Oh, Dr. Wood, I thought you were Black!’ And then she brightened up. ‘That’s all right,’ she said. ‘I'll get you on the radio.’ (laughs)

Peter H. Wood, here exploring chimney remains, is revising his book Strange New Land: Africans in Colonial America, which will be published in an expanded edition this year.

So, that just illustrates, if I’d been Black, it would have been even better, but at that point, anything was grist for the mill, especially if it was opening up new territory in American history.

Question: That actually raises a question: Did you face any criticism as a white author writing about Black history, like author William Styron did?

Wood: That was the controversy about William Styron’s 1967 book, The Confessions of Nat Turner. Styron was a white Connecticut author, and quite well-informed and well-intended. He had been raised in Virginia himself, so he’d grown up with versions of this story.

He was not a historian. Still, he wanted to try to write about Nat Turner’s rebellion from Turner’s perspective. So, he had the freedom of a novelist, of trying to put himself inside Nat Turner’s head. That effort was troublesome to a lot of folks.

It bothered some Black folks because it was a white author trying to do that and showing a complicated version of things. It was also upsetting to some white folks. If they knew about Nat Turner at all, it was that he was some crazy madman who killed people, so the idea that you should try to get inside his head, that was upsetting to them.

But, in answer to your question, I was lucky in that … the critique that white people shouldn’t do Black history had not really taken hold. At that time (1974), very little was being written about African Americans in Colonial times … and so there was a desire for anything that could shine some light on the subject.

Question: Why do you think Black Majority has maintained its staying power over the years? And what changes were made for the 50th-anniversary edition that W. W. Norton published?

Wood: As I’ve said, it came along at the right time. Along with other works, it opened up a whole new area, and so early African American history is now a very active field.

When I did the revisions for this 50th-anniversary edition, I didn’t change it drastically, because it is a product of the early 1970s, of 50 years ago. I think the points I made then have held up pretty well. That’s why I’d say it has been influential in the academic community, but for the general public, not so much.

Question: Why do you think that is?

Wood: It’s very hard to change the mainstream narrative, especially in regard to our childhood education about early American history. From elementary school on, we hear about Jamestown and about the Puritans; we learn that colonists grew tobacco in Virginia, but almost nothing beyond that. …

I think that’s part of our failing over the last 50 years. The idea of having a national story that everyone can agree upon has fallen apart, and I wish we could knit it back together. It may be too little, too late. But if we if we can ever manage to knit it back together in a more thorough, honest way, African Americans in Colonial times will be one of the early chapters.

Twenty years ago, I worked on a very successful U.S. history textbook called Created Equal, where I wrote the first six chapters. Even then, our team was trying to tie all of American history together in a new and inclusive way—one that everyone could understand and share and discuss. … I hope that book, and Black Majority, is more relevant than ever.

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CU Adjunct Professor Peter H. Wood’s seminal 1974 book on race, rice and rebellion in Colonial America recently celebrated its 50th anniversary with an updated version.

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Top image: Remnants of rice fields along the Combahee River in South Carolina. (Photo: David Soliday/National Museum of African American History and Culture)

Breaking bonds in 'forever chemicals'

Rachel Sauer — Fri, 20 Dec 2024 17:23:20 +0000

Breaking bonds in 'forever chemicals' Rachel Sauer Fri, 12/20/2024 - 10:23

Arindam Sau , Mihai Popescu and Xin Liu

We developed a way to use light to dismantle PFAS ‘forever chemicals’–long-lasting environmental pollutants

Perfluoroalkyl and polyfluoroalkyl substances, or PFAS, have earned the nickname of forever chemicals from their extraordinary ability to stick around in the environment long after they’ve been used.

These synthetic compounds, commonly used in consumer products and industrial applications for their water- and grease-resistant properties, are now found practically everywhere in the environment.

Arindam Sau, a Ph.D. candidate in the CU ��«��Ƶ Department of Chemistry, along with Colorado State University research colleagues Mihai Popescu and Xin Liu, developed a chemical system that uses light to break down bonds between carbon and fluorine atoms.

While many chemicals will degrade relatively quickly after they’re disposed of, PFAS can stick around for up to 1,000 years. This durability is great for their use in firefighting foams, nonstick cookware, waterproof clothing and even food packaging.

However, their resilience means that they persist in soil, water and even living organisms. They can accumulate over time and affect the health of both ecosystems and humans.

Some initial research has shown potential links between PFAS exposure and various health issues — including cancers, immune system suppression and hormone disruption. These concerns have led scientists to search for effective ways to break down these stubborn chemicals.

We’re a team of researchers who developed a chemical system that uses light to break down bonds between carbon and fluorine atoms. These strong chemical bonds help PFAS resist degradation. We published this work in Nature in November 2024, and we hope this technique could help address the widespread contamination these substances cause.

Why PFAS compounds are so hard to break down

PFAS compounds have carbon-fluorine bonds, one of the strongest in chemistry. These bonds make PFAS incredibly stable. They resist the degradation processes that usually break down industrial chemicals – including hydrolysis, oxidation and microbial breakdown.

Conventional water treatment methods can remove PFAS from water, but these processes merely concentrate the contaminants instead of destroying them. The resulting PFAS-laden materials are typically sent to landfills. Once disposed of, they can still leach back into the environment.

The current methods for breaking carbon-fluorine bonds depend on use of metals and very high temperatures. For example, platinum metal can be used for this purpose. This dependence makes these methods expensive, energy-intensive and challenging to use on a large scale.

How our new photocatalytic system works

The new method our team has developed uses a purely organic photocatalyst. A photocatalyst is a substance that speeds up a chemical reaction using light, without being consumed in the process. Our system harnesses energy from cheap blue LEDs to drive a set of chemical reactions.

After absorbing light, the photocatalyst transfers electrons to the molecules containing fluorine, which breaks down the sturdy carbon-fluorine bonds.

By directly targeting and dismantling the molecular structure of PFAS, photocatalytic systems like ours hold the potential for complete mineralization. Complete mineralization is a process that transforms these harmful chemicals into harmless end products, like hydrocarbons and fluoride ions, which degrade easily in the environment. The degraded products can then be safely reabsorbed by plants.

A wide variety of products can contain PFAS. (Graphic: City of Riverside, California)

Potential applications and benefits

One of the most promising aspects of this new photocatalytic system is its simplicity. The setup is essentially a small vial illuminated by two LEDs, with two small fans added to keep it cool during the process. It operates under mild conditions and does not use any metals, which are often hazardous to handle and can sometimes be explosive.

The system’s reliance on light – a readily available and renewable energy source – could make it economically viable and sustainable. As we refine it, we hope that it could one day operate with minimal energy input, outside of the energy powering the light.

This platform can also transform other organic molecules that contain carbon-fluorine bonds into valuable chemicals. For instance, thousands of fluoroarenes are commonly available as industrial chemicals and laboratory reagents. These can be transformed into building blocks for making a variety of other materials, including medicines and everyday products.

Challenges and future directions

While this new system shows potential, challenges remain. Currently, we can degrade PFAS only on a small scale. While our experimental setup is effective, it will require substantial scaling up to tackle the PFAS problem on a larger level. Additionally, large molecules with hundreds of carbon-fluorine bonds, like Teflon, do not dissolve into the solvent we use for these reactions, even at high temperatures.

As a result, the system currently can’t break down these materials, and we need to conduct more research.

We also want to improve the long-term stability of these catalysts. Right now, these organic photocatalysts degrade over time, especially when they’re under constant LED illumination. So, designing catalysts that retain their efficiency over the long term will be essential for practical, large-scale use. Developing methods to regenerate or recycle these catalysts without losing performance will also be key for scaling up this technology.

With our colleagues at the Center for Sustainable Photoredox Catalysis, we plan to keep working on light-driven catalysis, aiming to discover more light-driven reactions that solve practical problems. SuPRCat is a National Science Foundation-funded nonprofit Center for Chemical Innovation. The teams there are working to develop reactions for more sustainable chemical manufacturing.

The end goal is to create a system that can remove PFAS contaminants from drinking water at purification plants, but that’s still a long way off. We’d also like to one day use this technology to clean up PFAS-contaminated soils, making them safe for farming and restoring their role in the environment.

Arindam Sau is a Ph.D. candidate in the ��«��Ƶ Department of Chemistry; Mihai Popescu is a postdoctoral associate in chemistry at Colorado State University; Xin Liu is a postdoctoral scholar in chemistry at Colorado State University.

This article is republished from The Conversation under a Creative Commons license. Read the original article.

We developed a way to use light to dismantle PFAS ‘forever chemicals’ – long-lasting environmental pollutants.

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Top image: PFAS foam washed up on beach (Photo: Michigan Department of Environment, Great Lakes and Energy)

There’s a reason it’s called ‘graveyard’

Rachel Sauer — Thu, 19 Dec 2024 23:37:14 +0000

There’s a reason it’s called ‘graveyard’ Rachel Sauer Thu, 12/19/2024 - 16:37

Chris Quirk

In a study she conducted while she was a CU ��«��Ƶ postdoctoral researcher, Elizabeth Holzhausen and colleagues find a link between night-shift work and prostate-cancer risk

More workers than ever before can take advantage of flexible schedules. But some in health care, emergency services, manufacturing and other occupations are often constrained to regular overnight shifts. Epidemiologist Elizabeth Holzhausen had questions about the serious health risks associated with night shift work, specifically regarding prostate cancer.

Holzhausen, who worked as a postdoctoral associate in the ��«��Ƶ Department of Integrative Physiology before recently becoming an assistant research professor at the Johns Hopkins Bloomberg School of Public Health, is coauthor—along with Jinyoung Moon of the College of Natural Sciences, Seoul National University, and Yongseok Mun of the Hallym University Kangnam Sacred Heart Hospital in Seoul—of a study examining the prevalence of prostate cancer in men who regularly work the night shift.

While a postdoctoral associate in the CU ��«��Ƶ Department of Integrative Physiology, Elizabeth Holzhausen studied the prevalence of prostate cancer in men who work the night shift.

They also examined whether the number of years on that shift increased the risk to employees. Their paper was recently published in the journal Heliyon.

For the study, Holzhausen and her colleagues conducted a meta-analysis, examining a large number of studies that looked at prostate cancer incidence and its possible relationship to night-shift work. One motivation for the meta-analysis was that there had been mixed results regarding any correlation between prostate cancer and night-shift workers in past studies. Holzhausen and the research team hoped to settle the matter with a rigorous meta-analysis.

Previous research has shown that working the night shift can present numerous health hazards. Along with heightened cancer risk, night shifts can increase the probability of heart disease, stroke, type 2 diabetes and sleep disorders in workers.

According to the Centers for Disease Control, 13% of men will get prostate cancer, and approximately 3% of men die from the disease, which is more likely to strike older men. Definitive current figures are difficult to find, but the U.S. Bureau of Labor Statistics reported that in 2018, close to 4% of employees worked the night shift, including approximately 2.5 million men.

Prostate cancer and the night shift

In their study, Holzhausen and her co-authors found that there was a link between increased incidence of prostate cancer and night-shift work. They also determined that the longer men worked the night shift, the higher the risk became. The study showed that workers on the night shift for just one year had a 1% increase in prostate cancer risk, but for workers who had 30 years of overnight shifts, that risk jumped to 39%.

“I was surprised about the magnitude of the findings,” says Holzhausen. “There are a lot of people who work the night shift, so this is especially impacting people who work this shift over a long period of time.”

As Holzhausen explains, the disruptions to the body from shift work are significant: “There are several cancers that have been associated with night-shift work, and one of the big things is that we know lack of sleep and circadian misalignment can reduce the functioning of the immune system,” she says. “As a result, [the body’s] surveillance for cancer cells could be impacted if someone is doing chronic night-shift work.”

One of the challenges of the study was controlling for outside factors across a number of different studies that used different methods. A large chunk of the paper describes how the researchers achieved that.

"There are several cancers that have been associated with night-shift work, and one of the big things is that we know lack of sleep and circadian misalignment can reduce the functioning of the immune system."

“We were very rigorous about what studies we included," says Holzhausen. "Studies where the exposure was maybe nursing or some occupation that could be night-shift work, but they didn't explicitly identify if they were doing night-shift work, were excluded. We only looked at studies where specifically night-shift work was the exposure.”

The researchers also included studies that controlled for socioeconomic status to remove it as a variable in the study. "Nearly all of the studies included in our meta-analysis considered socioeconomic status. We did not analyze socioeconomic status explicitly and aren’t able to make inferences about different socioeconomic strata," says Holzhausen.

"However, the aim in adjusting for socioeconomic status is to estimate the impact of night-shift work on risk of prostate cancer independent of socioeconomic status. In other words, the results we observed are unlikely to be due to differences in socioeconomic status between day- and night-shift workers."

Holzhausen says that since night-shift work is probably not going away anytime soon, night-shift workers should be proactive in mitigating the potential risks: “Get additional screenings for prostate cancer, and take other measures that we know can help prevent prostate cancer, like eating a healthy diet, maintaining a healthy weight, limiting alcohol and not smoking.”

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In a study she conducted while she was a CU ��«��Ƶ postdoctoral researcher, Elizabeth Holzhausen and colleagues find a link between night-shift work and prostate-cancer risk.

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Top image: Pixaby

Sand verbena uses grains of sand to deter herbivores

Rachel Sauer — Thu, 19 Dec 2024 19:41:09 +0000

Sand verbena uses grains of sand to deter herbivores Rachel Sauer Thu, 12/19/2024 - 12:41

Jeff Mitton

Apparently, herbivores are not fond of chewing sandpaper

Sand verbena, Abronia fragrans, has a moth pollination syndrome, or a suite of floral characters modified by natural selection driven by moth pollination. Its flowers are open all night but closed all day, and long corolla tubes prevent bees from taking nectar but are ideal for moths with long tongues.

Moths follow plumes of floral fragrance from sand verbena until they are within sight of the bright, conspicuous white globes of 25 to 80 flowers, where they sip a nectar reward.

Although sand verbena has a large geographic range, it is limited to sandy habitats in Texas, New Mexico, Arizona, Utah, Colorado, Oklahoma, Kansas, Wyoming, Montana, Nebraska, South Dakota and North Dakota. While sand verbena is described as having white flowers that open only at night, populations in northern Texas and southwestern Oklahoma have a range of flower colors from light pink through fuchsia, and they also differ from most populations in the times that flowers open and close.

The plants with pink or fuchsia flowers remain open until late morning, and they reopen in early evening, allowing considerable visitation by bees and butterflies. Measurements of pollination success in the pink and fuchsia populations showed that diurnal or daytime pollination contributed 18% of the pollination success, in contrast to nothing at all in the remainder of the geographic range of the species.

Dwarf lupine with patches and particles of sand on its flowers, leaves and stem. (Photo: Jeff Mitton)

These data are consistent with the hypothesis that diurnal pollinators were a selective force producing and maintaining novel flower color and diurnal presentation of open flowers in the mornings and late afternoons. The long corolla tubes frustrate bee efforts to collect pollen or nectar but hold nectar available to virtually all butterflies.

Butterflies are visiting diurnally—the most common among them is the skipper Lerodea eufala, the Eufala skipper. These data and other observations suggest the hypothesis that the Eufala skipper applied selective pressure to change flower color from white to pink or fuchsia and to modify the times that flowers open and close.

How could a butterfly apply selection pressure? This terminology unintentionally suggests that the butterflies had a plan and the organization to apply it. But that was not the case. If some flowers did not close exactly at sunrise and if a small butterfly pollinated them, enhancing their seed set, the genes that influenced tardy closing of flowers would become more common in the next generation.

The butterfly did nothing more than sip nectar from a large globe of flowers, nor did the sand verbena do anything to achieve an intended goal. The metric of natural selection is the relative number of offspring produced by competing genotypes of sand verbena. Genes that had been rare produce more seeds, making those genes more common.

Sand verbena is in the genus Abronia, which has about 20 species, all in North and Central America. All thrive in sandy environments, and it is known that 14 of the 20 species have psammophory, a defense to herbivory that is more commonly called sand armor. The armor is assembled when wind-blown sandy grit adheres to sticky exudates on stems and leaves.

I first encountered psammophory when photographing dwarf lupine in the Maze in Canyonlands National Park, and since then I thought it was a rare defense. But a scientific article whose title begins with "Chewing sandpaper" lists more than 200 psammophorous species in 88 genera in 34 families.

Sand armor is not a rare defense; it is geographically widespread and has evolved many times. Experimental studies show that sand armor reduces herbivory—remove it from stems and leaves, and the plant suffers more herbivory than when the armor was intact. Add more sand, and the plant suffers less herbivory.

While sand verbena has a large geographic range, some species of Abronia have tiny geographic distributions. One example is Yellowstone sand verbena, A. ammophila, which is adapted to and endemic (found nowhere else) to the lake shores in Yellowstone National Park.

An obligate relationship was found recently when a new species of moth, Copablepharon fuscum, was discovered in 1995 on the shores of the Salish Sea between Georgia Straight and Puget Sound. The sand-verbena moth was found on just a few beaches and spits on Vancouver Island and Whidbey Island, and it only occupies sites with windblown sand and large and dense populations of A. latifolia, yellow sand verbena, which is found along Pacific Shores from Baja to British Columbia.

The sand-verbena moth uses yellow sand verbena as its host plant, meaning that it is the site of oviposition and the sole food consumed by the caterpillars. The caterpillars have specialized mouth parts allowing them to manipulate around grains of sand.

I know I will never see a sand verbena nor a dwarf lupine without the phrase "chewing sandpaper" popping into my thoughts.

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Apparently, herbivores are not fond of chewing sandpaper.

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Top image: Sand verbena usually presents white blooms but response to a pollinator can turn a population pink or fuchsia. (Photo: Jeff Mitton)

Learning the recipe for grizzly gourmet

Rachel Sauer — Thu, 12 Dec 2024 14:30:00 +0000

Learning the recipe for grizzly gourmet Rachel Sauer Thu, 12/12/2024 - 07:30

Doug McPherson

CU ��«��Ƶ anthropology PhD candidate Sabrina Bradford has been learning what’s on the menu for grizzlies in Montana

If you’re ever heading to Montana’s backcountry, you’d be hard pressed to find a better guide than Sabrina Bradford, a ��«��Ƶ PhD candidate in biological anthropology.

Bradford has spent more than a decade in the area’s countryside, mostly on horseback, studying conflict between humans and wildlife, social-ecological systems, livestock damage and the grizzly-bear diet.

Lately she’s been getting noticed for that last item.

Anthropology PhD candidate Sabrina Bradford (left) wrote Grizzly Bear Foods: Reference Guide to the Plants, Animals, and Fungi in the Montana Grizzly Bear's Diet, published by Montana Fish, Wildlife and Parks.

This fall, Montana Fish, Wildlife and Parks published her new 100-page book, Grizzly Bear Foods: Reference Guide to the Plants, Animals, and Fungi in the Montana Grizzly Bear's Diet, which will be part of the state’s “bear aware” education program for the public in 2025.

“I saw a lot about how grizzlies used the landscape,” says Bradford, who sometimes has ridden 20 miles a day in the backcountry doing research and working as a guide and bear education specialist. “I took plenty of photos of grizzly bear signs―areas where it looked like a tiller had rolled through the soil, over rocks and torn up trees. I wanted people to be able to see the landscape similar to the way I did. It’s really important to me that the public understands what bears are actually doing on the landscape.”

Of course, that landscape is a massive buffet for grizzlies, whose four food groups are plants, animals, fungi and trash from humans. A few specific examples of their diet: grasses, shrubs, seeds and fruits of trees, mushrooms, ducks, bird eggs, trout, salmon, squirrels, beaver, moose, bison, elk, deer, bighorn sheep, ants, termites and bees.

Bradford, who graduates this month, says grizzlies serve an important role as seed dispersers within the ecosystem there, and many of the shrubs grizzlies eat produce berries (e.g. huckleberry, raspberry, serviceberry, grouse whortleberry, buffaloberry) that are dispersed via scat.

‘Pretty cool animals’

“Bears are pretty cool animals,” Bradford says. “They have incredible spatiotemporal memory [they can recall where and when food was presented], and they use social learning. Mom teaches her cubs food acquisition strategies. This is key for people to understand, those who question why cubs were removed from an area as well as when the mother is removed for dumpster diving. She’s just teaching her cubs how to access a reliable food resource.”

Bears are also not above stealing other animals’ food stash, an activity called kleptoparasitism.

Grizzly bears sometimes steal other animals' food stashes, an act called kleptoparasitism. (Photo: Montana Fish, Wildlife and Parks)

“People who hike in grizzly country with their dogs off the leash say their dog will protect them. That doesn’t really work,” Bradford explains. “Kleptoparasitism is one of the food-source acquisition strategies grizzlies use, and they’ll steal food from packs of wolves. Wolves will yield to grizzly bears, and your dog is nowhere near as tough as a pack of wolves.”

Bradford says while she’s seen many grizzlies, she’s never had to use her bear spray. Her advice to avoid attacks: “Realize that the human voice is the most powerful deterrent out there, not radios or bear bells. Talk loud in areas of low visibility so the bears can hear you coming. It’s critical to understand that you shouldn’t surprise a bear, that they’ll do anything to protect their cubs. And be aware of magpies or ravens in the forest because they’re a sign you might be hiking up on a carcass.”

And while grizzlies’ sense of hearing is strong, their sense of smell is astounding. “The size of the olfactory bulb, the part of the brain that processes scent information in grizzlies, is more than five times larger than humans’ olfactory bulb.” She advises people to sleep in clothes they haven’t cooked in: “Just because you can’t smell food on your clothes doesn’t mean bears can’t.”

Bradford adds that there is a common misunderstanding that grizzlies are looking to wipe out the first person they see and that livestock producers want to kill all grizzlies.

“That isn’t true,” she says. “Yes, livestock loss to grizzlies does occur, but ranchers I interviewed said over 80% of the grizzlies out there never cause any trouble. And other ranchers reported that it’s common to see grizzlies grazing grass in the same fields that the cattle use.”

She recalls one rancher telling her, “’Wildlife is embedded deep in our traditions. We don't hate grizzly bears; they're amazing animals. I don't want to give up all I have to the grizzly bear but I'm willing to share it.’”

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CU ��«��Ƶ anthropology PhD candidate Sabrina Bradford has been learning what’s on the menu for grizzlies in Montana.

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