Thursday, June 27, 2024

 

First of its kind study shines light on LGBTQ+ farmer mental health




UNIVERSITY OF ILLINOIS COLLEGE OF AGRICULTURAL, CONSUMER AND ENVIRONMENTAL SCIENCES

LGBTQ+ farmer mental health 

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NEW RESEARCH FROM THE UNIVERSITY OF ILLINOIS URBANA-CHAMPAIGN INDICATES LGBTQ+ FARMERS MAY FEEL A DOUBLE BURDEN OF MENTAL HEALTH CHALLENGES. 

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CREDIT: COURTNEY CUTHBERTSON, UNIVERSITY OF ILLINOIS URBANA-CHAMPAIGN





URBANA, Ill. -- LGBTQ+ people involved in farm work are over three times more likely to experience depression and suicidal intent and about two and a half times more likely to experience anxiety than the general population. That’s according to a new study led by farmer mental health experts at the University of Illinois Urbana-Champaign.  

“For several years, I've done work around farm stress and mental health among farmers in general. We’ve found people who work in agriculture have adverse mental health compared to those who work in other areas. Similarly, there are findings that queer folks have worse mental health than their straight and cisgender peers. I was motivated to do this study because there's very little research that looks at the crossover of LGBTQ+ people who work in agriculture,” said Courtney Cuthbertson, assistant professor and Illinois Extension specialist in the Department of Human Development and Family Studies, part of the College of Agricultural, Consumer and Environmental Sciences (ACES) at Illinois.

Studies have estimated at least 23,000 LGBTQ+ people are involved in U.S. farming; the actual number is likely higher, Cuthbertson said. The research team surveyed LGBTQ+ farmers across the U.S., asking standardized questions about sexual and gender identity, stress, anxiety, depression, resilient coping, and suicide risk, as well as agricultural commodity type. They received and analyzed 148 responses from 36 states, with greater representation among people in organic production and in California, Illinois, New York, and Texas. 

About 72% of respondents were experiencing symptoms of mild to severe depression; 70% mild to severe anxiety; and 52% were at significant risk of suicide. 

“The percentages that had probable depression and probable anxiety disorder were in alignment with, if not higher than, general farming populations, which would indicate a double burden for LGBTQ+ folks in farming,” Cuthbertson said. “However, the percentage at significant risk for suicide was much lower than in samples of LGBTQ+ people who are not in farming. That leads me to wonder whether working in agriculture could have a protective effect for LGBTQ+ people regarding suicide risk.” 

When the subgroups were analyzed individually, it turned out that a greater proportion of people identifying as men experienced anxiety, depression, and suicide risk compared to non-men, a pattern mirrored in the farming community at large. Cuthbertson said this may be due to norms around masculinity in agriculture.

Further, gay respondents and those working in field crops and beef production were more likely to have probable depression, though beef producers were least likely to have a diagnosis of depression from a medical professional. Generally, more respondents appeared to have depressive or anxiety symptoms than had been medically diagnosed for these disorders. Again, Cuthbertson said that aligns with their research on farmers in general.

“Agriculture is intensive. Someone might feel the time costs to go to a provider come with a financial cost of not being productive during that time,” they said. “And in a lot of agricultural communities, there's a stigma around mental health, where someone might not want their vehicle to be seen in front of the therapist’s office. 

“But for LGBTQ+ folks in particular, there may be concern about whether someone's identity would be validated or whether they would be greeted with the proper pronouns and addressed in a respectful way. They may not have supervisors or managers who are willing to let them take a break to go to therapy. They may also not have health benefits that would include mental health coverage.”

The research team created several fact sheets based on this research, as well as resources for allies in the farming community who want to support LGBTQ+ farm workers. Their advice includes adapting language to be more inclusive of non-cisheteronormative gender and relationship statuses; engaging in allyship or cultural competency trainings; and offering equitable resources and support to everyone.

“It’s important to look at what’s happening in the environment for LGBTQ+ folks, rather than assuming the problem lies with them. When we see things like depression, anxiety, or suicide, these are signs that something is distressing,” Cuthbertson said. “Let’s identify root causes and see what we can do about it, rather than problematizing a marginalized group.”

Cuthbertson stresses that the contributions of LGBTQ+ people in the farming community should not be discounted or dismissed. “There have been so many conversations about making agriculture a more sustainable industry to ensure future food security,” they said. “I’ve made the argument that agriculture can’t be sustainable unless it’s sustainable for the people working in it, which means being attentive to mental and physical health as well as making the industry as inclusive as possible for any and all who want to be part of it.”

The researchers suggest the following resources for LGBTQ+ farmers and for those struggling with mental health:

The study, “Mental health among LGBTQ+ farmers in the United States,” is published in the Journal of Agromedicine [DOI: 10.1080/1059924X.2024.2368185]. Authors include Courtney Cuthbertson, Dane Rivas-Koehl, Anisa Codamon, Alyssa Billington, and Matthew Rivas-Koehl. The research was supported in part by the USDA National Institute of Food and Agriculture.

Cuthbertson is also affiliated with the Center for Social and Behavioral Science at Illinois.

 

Prenatal exposure to ethylene oxide associated with lower birth weight and head circumference in newborns



The study involving 1,106 newborns from five countries examined the impact of ethylene oxide exposure during the last three months of pregnancy on foetal development and birth outcomes




BARCELONA INSTITUTE FOR GLOBAL HEALTH (ISGLOBAL)




A study led by the Barcelona Institute for Global Health (ISGlobal), a centre supported by the "la Caixa" Foundation, provides new evidence on the adverse effects of prenatal exposure to ethylene oxide (EO) on foetal development. The results, published in Epidemiology, show that increased EO exposure in utero is associated with a reduction in birth weight and head circumference in newborns.

Ethylene oxide is a chemical used in various industrial processes and in hospitals, is known for its mutagenic and carcinogenic properties. Human exposure to EO is mainly through inhalation of tobacco smoke and air pollution produced from various household products, including cleaning and personal care products. Workers in the healthcare and chemical industries are particularly exposed to this substance, which is commonly used in sterilisation processes. Previous studies have found that women exposed to higher levels of EO at work during pregnancy had a higher risk of miscarriage and premature birth than those with lower exposure.

This new study focused on pregnant women and newborns in the general population, rather than a specific population with known high levels of EO exposure. The research team looked at the levels of EO hemoglobin (Hb) adducts in the cord blood of 1,106 newborns from 5 countries: Greece, Spain, Norway, UK and Denmark. This measurement provides valid information on the amount of EO the foetus was exposed to during the last three months of pregnancy, which may help to better understand potential adverse effects on foetal development and birth outcomes.

The study used data from the NewGeneris project, which aimed to study genotoxic exposures in the environment on children's health by measuring several biomarkers in cord blood. Information on birth weight, head circumference, sex and gestational age was obtained from maternity records.

Higher exposure, lower birth weight and smaller head circumference

The results of the study showed that median levels of EO-Hb adducts in the umbilical cord were higher in smoking mothers compared to non-smoking mothers. Higher levels of hemoglobin adducts were associated with lower birth weight. Specifically, mean birth weight decreased by 3.30 grams with each 10 pmol/g increase in hemoglobin adducts. Increasing levels of hemoglobin adducts were also associated with a decrease in head circumference.

“Reduced head circumference has been linked to delayed neurodevelopment, and reduced birth weight increases the risk of cardiovascular diseasetype 2 diabetes mellitus and osteoporosis,” says Barbara Harding, ISGlobal researcher and first author of the study. 

The team found no evidence of an association between EO Hb adduct levels and the risk of being small for gestational age (SGA), a condition that can compromise a baby's short and long-term health.

"The study results highlight the importance of addressing EO exposure in both occupational and non-occupational settings. Policy changes to reduce EO exposure in vulnerable populations, such as women of childbearing age, could protect foetal health and improve birth outcomes," says Manolis Kogevinas, ISGlobal researcher and senior author of the study.


Reference 

Harding BN, Agramunt, S., Pedersen, M., Knudsen, LE., Nielsen, JKS, Wright, J, Vafeiadi, M., Merlo, DF., Stayner, L., Kelly-Reif, K., Espinosa, A., Bustamante, M., Gützkow, KB., Granum, B., von Stedingk, H., Rydberg, P., Alexander, J., Törnqvist, M., Kogevinas, M. Ethylene oxide hemoglobin adducts in cord blood and offspring’s size at birth: The NewGeneris European Cohort Study. Epidemiology. 2024. DOI: 10.1097/EDE.0000000000001767

 

Printed sensors in soil could help farmers improve crop yields and save money



UNIVERSITY OF WISCONSIN-MADISON

soil sensors1-field test 

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SOIL SCIENCE PHD STUDENT SHUOHAO CAI PLACES A SENSING ROD, WHICH HAS MULTIFUNCTIONAL SENSING STICKERS POSITIONED TO ENABLE MULTI-DEPTH MEASUREMENTS, IN SOIL AT UW-MADISON’S HANCOCK AGRICULTURAL RESEARCH STATION TO TEST THE TEAM'S TECHNOLOGY. CREDIT: KUAN-YU

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CREDIT: PHOTO BY KUAN-YU CHEN




MADISON — University of Wisconsin–Madison engineers have developed low-cost sensors that allow for real-time, continuous monitoring of nitrate in soil types that are common in Wisconsin. These printed electrochemical sensors could enable farmers to make better informed nutrient management decisions and reap economic benefits.  

“Our sensors could give farmers a greater understanding of the nutrient profile of their soil and how much nitrate is available for the plants, helping them to make more precise decisions on how much fertilizer they really need,” says Joseph Andrews, an assistant professor of mechanical engineering at UW–Madison who led the research. “If they can buy less fertilizer, the cost savings could be quite significant at large-acreage farms.”

While nitrate is an essential nutrient for growing crops, excess nitrate can leach out of soil and into groundwater. This type of pollution is dangerous for people who drink contaminated well water and is harmful for the environment. The researchers’ new sensors could also be used as an agricultural research tool to monitor nitrate leaching and help guide best practices for mitigating its harmful effects.

Current methods for monitoring nitrate in the soil are laborious, expensive and don’t provide real-time data. That’s why Andrews, an expert in printed electronics, and his team set out to create a better and less costly solution. 

For this project, the researchers used an inkjet printing process to fabricate potentiometric sensors, a type of thin-film electrochemical sensor. Potentiometric sensors are commonly used to accurately measure nitrate in liquid solutions. However, these sensors aren’t typically suitable for use in soil environments, where coarse soil particles will scratch them and interfere with obtaining accurate measurements.

“The main challenge we were trying to solve is figuring out a way to enable these electrochemical sensors to work well in the harsh environment of soil and accurately sense nitrate ions,” Andrews says.

The team’s solution was to place a layer over the sensor made from polyvinylidene fluoride. Andrews says this material has two key features. First, it has very tiny pores, about 400 nanometers in size, that allow nitrate ions to pass through while blocking soil particles. Second, it’s hydrophilic, meaning it attracts water and acts like a sponge to absorb it. 

“So, any nitrate-laden water gets preferentially soaked into our sensor, and this is really important because soil also acts like a sponge, and you’re going to have a losing battle for getting moisture to come to your sensor unless you can match the water absorption potential of soil,” Andrews says. “These features of the polyvinylidene fluoride layer enable us to extract the nitrate-laden water, get it to the surface of our sensor and accurately sense nitrate.”

The researchers detailed their advance in a paper published in March 2024 in the journal Advanced Material Technologies.

The team has tested its sensors in two different soil types that are relevant for Wisconsin — sandy soil, which is common in the north-central part of the state, and silt loam soil, which is common in southwestern Wisconsin — and found that the sensors produced accurate results.

The researchers are now incorporating their nitrate sensors into a multifunctional sensing system they call a “sensing sticker,” in which three different kinds of sensors are mounted on a flexible plastic surface with an adhesive on the back. These stickers also contain moisture and temperature sensors.

The researchers will attach several sensing stickers to a rod, positioning them at different heights, and then bury the rod in the soil. This setup allows them to take measurements at multiple depths in the soil. 

“By measuring the nitrate, moisture and temperature at different depths, we can now quantify the process of nitrate leaching and capture how nitrate is moving through the soil, which hasn’t been possible before,” Andrews says.

In summer 2024, the researchers plan to conduct further testing with their sensors by deploying 30 sensing rods in the soil at UW–Madison’s Hancock Agricultural Research Station and Arlington Agricultural Research Station.

The researchers are patenting their technology through the Wisconsin Alumni Research Foundation.

UW–Madison co-authors on the paper include Kuan-Yu Chen, Aatresha Biswas, Shuohao Cai, and Jingyi Huang, a professor of soil science.

This research was supported by the USDA Agriculture and Food Research Initiative Foundational Program (project no. WIS04075), the National Science Foundation Signals in the Soil grant 2226568, and the University of Wisconsin–Madison Dairy Innovation Hub.

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--Adam Malecek, acmalecek@wisc.edu

Disclaimer: AAAS and EurekAlert

 

What can social media tell us about public views on climate change?




INTERNATIONAL INSTITUTE FOR APPLIED SYSTEMS ANALYSIS





IIASA researchers contributed to a new study, analyzing the main narratives in public discussions of climate change on social media.

Online social media platforms play a major role in shaping individual attitudes and behaviors, serving as popular sources of information as well as a forum for public discussion. These platforms have also piqued the interest of researchers, as they provide a window into public perceptions on prominent global issues like climate change.

IIASA Cooperation and Transformative Governance Research Group Leader, Nadejda Komendantova and her colleagues from the University of Oregon in the US and the College of Law & Business in Israel, recently undertook a study to decipher these narratives. They identified the most popular narratives in the discussions of climate issues on X (formerly Twitter), using a selected sample of 333,635 English tweets focusing on man-made climate change. The team reviewed and categorized the content of the tweets and common patterns, as well as the influence major climate events and reports have on public awareness and involvement in the discussion.

The study employed Natural Language Processing (NLP) and machine learning methods to analyze the meaning of the tweets and cluster them into four main categories corresponding to the most prominent narratives, as well as the most common stances and sources used in each cluster:

  • Anthropogenic cluster – tweets focusing on whether man-made climate change is real or not. This cluster commonly references websites that serve user content, such as YouTube, Rumble, and WordPress.
  • Scientific cluster – tweets that rely on scientists and scientific findings to discuss the narrative of man-made climate change.
  • Policy cluster – tweets mainly discussing policy matters, such as the importance of climate change mitigation to reduce greenhouse gas emissions. Commonly references the Intergovernmental Panel on Climate Change (IPCC), The Guardian, The New York Times, The Washington Post, and others, as well as the Nature Journal’s website.
  • Conspiracy cluster – tweets related to conspiracy theories. These posts commonly reference websites that serve user content, such as YouTube, Rumble, and WordPress, as well as websites promoting the narrative that climate change is not caused by humans.

“Understanding the different narratives surrounding the discussion of anthropogenic climate change on social media can help improve communication policies and enable better outreach to different social groups,” explains Komendantova. “It can also help to enable better exchange of best practices among the different stakeholders, which is important for achieving the Sustainable Development Goals.”

The results show that the existence of climate change, the human factor leading to the current situation, and the solution are contested issues that attract controversial discourses. The authors emphasizes the challenges related to climate change adaptation and mitigation measures, notably the necessity of increasing the awareness of the population about climate issues as part of the adaptation process.

The analysis shows that major events, such as extreme weather events and significant climate change reports and conferences focuses attention on the discussion about climate change on social media and increase the daily frequency of tweets in different clusters.

The authors also highlight that conspiracy theories are continuously present on social media, and climate change conspiracy theories are no exception. For this reason, measures are continuously needed to counteract them, such as providing adequate, reliable, and correct information.

“Communication strategies should address misinformation and conspiracy theories on various social media platforms by monitoring multiple platforms while providing tools for debunking incorrect information about the existence of climate change, its causes, and its consequences,” notes Komendantova.

The study also provides recommendations for further analysis, such as further investigation of specific clusters or replication of this methodology in languages other than English.

Reference:
Elroy, O., Komendantova, N., Yosipof, A. (2024). Cyber-echoes of climate crisis: Unraveling anthropogenic climate change narratives on social media. Current Research in Environmental Sustainability. https://doi.org/10.1016/j.crsust.2024.100256. [https://pure.iiasa.ac.at/19811]

 

Urban green and blue spaces are linked to less coronary artery calcification


Associations are most pronounced among Black individuals living in deprived neighborhoods



NORTHWESTERN UNIVERSITY

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 Black participants with greater access to green spaces had up to 35% lower odds of calcification

·  Black participants living near a river had 32% lower odds of calcification

·  Coronary artery calcification is an early sign of cardiovascular disease

CHICAGO --- Being near and having more exposure to urban green space and blue (water) space is linked to lower odds of having coronary artery calcification in middle age, which is an early marker of cardiovascular disease.

The associations were more pronounced among Black individuals and those living in neighborhoods with lower socioeconomic status, with the strongest effects observed in Black individuals in economically deprived neighborhoods.

Specifically, Black participants with the highest accessibility to a river had 32% lower odds of coronary artery calcification compared to those with the lowest accessibility. Black participants with greater access to green spaces had up to 35% lower odds of calcification. For each 10%-point increase in green space, the odds of having coronary artery calcification decreased by 15% on average.

The study was published today June 27 Circulation.

Coronary artery calcification (CAC) is when calcium builds up in the plaque found in the walls of the coronary arteries. It can be a sign of early coronary artery disease, which can cause a heart attack.

“The protective effect of having access to urban blue and green spaces with coronary artery calcification highlighted in our study underscore the potential benefits of such infrastructure, particularly for underserved populations at higher risk for cardiovascular disease,” said corresponding author Dr. Lifang Hou, a professor of preventive medicine at Northwestern University Feinberg School of Medicine. “Our findings provide quantitative evidence supporting environmental policies to enhance the accessibility and quality of residential blue and green spaces, which can promote public health benefit and address racial and neighborhood-related health disparities.”

Why do green and blue spaces improve health?

“Having more green and blue spaces may provide increased opportunities for physical activities, social interactions, stress relief and restoration, all of which have been linked to improved metabolic and cardiovascular health,” Hou said. “Additionally, exposure to green and blue spaces has been shown to boost people’s immune system, reduce chronic inflammation and slow down the biological aging process, all of which are biologically important in people’s overall health and cardiovascular health. More studies are needed to fully understand the role of urban natural environments in pathways related to human health.”

Conversely, the study also showed shorter distances to parks were associated with higher odds of CAC in these neighborhoods, with individuals having the highest park accessibility showing 29% higher odds of CAC compared to those with the lowest accessibility.

“The poor condition of parks and/or safety concerns in underserved urban neighborhoods might deter park use and prevent residents from fully benefiting from these spaces,” said study first author Kyeezu Kim, adjunct assistant professor of preventive medicine at Feinberg and assistant professor at Sungkyunkwan University School of Medicine in South Korea. “From a public health perspective, the results suggest the need for quality control and management of the surrounding environment in neighborhoods with disadvantaged social determinants of health. More data is warranted to fully explain this observation.”

How the study was conducted

The study included 2,960 Black and white men and women (average age of 50 years) from Birmingham, Ala., Chicago, Ill., Minneapolis, Minn., and Oakland, Calif., who were followed for 25 years (from 1985-1986 to 2010-2011). While proximity to urban blue and green spaces has been linked to better cardiovascular health, few studies have examined the role of social determinants of health, such as race and neighborhoods with lower socioeconomic status in these associations, particularly with long-term observational data.

Data for this study were drawn from the Coronary Artery Risk Development in Young Adults (CARDIA) study, a multi-center prospective cohort study across four urban cities in the U.S. The CARDIA study began in 1985-1986 with 5,115 self-reported Black and white individuals in early adulthood (mean age 24.8). For blue and green spaces, researchers included percent blue space cover, distance to the nearest river, percent green space cover and distance to the nearest major park within 5 km of the participants’ residential addresses. The presence of CAC was measured using a CT (computed tomography) scan when participants were about 50 years old. Researchers examined the associations between each blue and green space and CAC by race and neighborhood socioeconomic status.

The CARDIA study is conducted and supported by the National Heart, Lung, and Blood Institute (NHLBI) in collaboration with the University of Alabama at Birmingham grants HHSN268201800005I and HHSN268201800007I, Northwestern University grant HHSN268201800003I, University of Minnesota grant HHSN268201800006I and Kaiser Foundation Research Institute grant HHSN268201800004I. The research is also supported by NHLBI grant R01HL114091 and National Institute on Aging grant R01AG081244, all of the National Institutes of Health. It is also supported by the American Heart Association.

 

 

 

 

 

US efforts to collect LGBTQ+ data among Medicaid patients is a ‘foundational step towards health equity'



A new commentary in JAMA explains the benefits of and barriers to recent federal guidance that encourages states to add sexual orientation and gender identity questions to their Medicaid applications.




BOSTON UNIVERSITY SCHOOL OF PUBLIC HEALTH





Compared to straight and cisgender individuals, sexual and gender minority adults in the US are more likely to face barriers paying for or accessing adequate health insurance and healthcare, but few states collect sexual and gender identity (SOGI) information to better understand the health challenges and needs of this population. To close this knowledge gap, the Centers for Medicare & Medicaid Services (CMS) added three optional SOGI questions to its model application, with guidance for states that choose to incorporate the questions into their Medicaid and Child Health Insurance Program (CHIP) applications.

This federal effort to encourage the collection of SOGI data from Medicaid patients is a foundational step towards advancing LGBTQ+ health equity, according to a new commentary by Dr. Kevin Nguyen, assistant professor of health law, policy & management at Boston University School of Public Health and led by Dr. Nathanial Tran, a 2024 graduate of the Health Policy PhD program at Vanderbilt University Medical Center and incoming assistant professor at the University of Illinois Chicago.

“Such federal guidance represents a significant step forward in improving the data infrastructure necessary to understanding potential inequities in health needs, access to and quality of care, and health outcomes for LGBTQ+ people served by Medicaid,” the authors write in JAMA.

The commentary discusses the benefits—as well as potential limitations—of CMS’ recommendations for incorporating SOGI questions into Medicaid applications, and considers how the agency can strengthen this guidance to ensure that SOGI data collection is comprehensive and more broadly representative of the LGBTQ+ population.

This guidance aligns with federal priorities under the Biden administration to provide a roadmap and best practices for agencies to develop SOGI data action plans. Previously, the Medicaid model application only included a “Sex” question to which applicants could select either “male” or “female.” The additional questions inquire about sex assigned at birth, gender identity, and sexual orientation.

This new guidance to expand SOGI data collection presents an opportunity for state and federal agencies to collect an unprecedented amount of SOGI data that is both self-reported—the “gold standard” in research—and standardized, among the 88 million adults enrolled in Medicaid and 7 million children enrolled in CHIP. 

"While this data would not be nationally representative, it has the potential to be the largest SOGI data collection effort to date in the US, and of any country,” the authors write. “Few states currently collect SOGI data on Medicaid paper applications, and among those that do, there are no uniform data standards. Systematic collection of SOGI data collection in Medicaid may help identify differences in LGBTQ+ patient experiences and opportunities for Medicaid policy design that have otherwise been unobservable on a large scale.”

This data collection could inform policies that spur targeted enrollment outreach, as well as assistance and resources to SOGI patients, who are more likely overall to be covered by Medicaid than straight and cisgender people. 

Given the need for this SOGI information, allowing states to opt in or out of collecting this data collection may curtail the comprehensiveness of the data, the authors argue. Only seven states currently include questions on their Medicaid applications about inclusive sex, gender identity, and/or sexual orientation: Maine, Massachusetts, New York, Connecticut, Nevada, Oregon, and Washington. 

“Optional–rather than mandatory–inclusion of these questions may mean the potential of these data may not be fully realized in the short term and may not be representative of all LGBTQ+ Medicaid enrollees,” the authors write. “Additional federal guidance is needed to develop nationally representative estimates of LGBTQ+ patients who are uninsured or have other forms of insurance.”

Click here to read the full commentary in JAMA.

**

About Boston University School of Public Health

Founded in 1976, Boston University School of Public Health is one of the top ten ranked schools of public health in the world. It offers master's- and doctoral-level education in public health. The faculty in six departments conduct policy-changing public health research around the world, with the mission of improving the health of populations—especially the disadvantaged, underserved, and vulnerable—locally and globally.

 

Wolves reintroduced to Isle Royale temporarily affect other carnivores, humans have influence as well


WISCONSIN IS A WOLF HUNTING STATE

UNIVERSITY OF WISCONSIN-MADISON
MRC summer 24 

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MAURIEL RODRIGUEZ CURRAS POSES FOR A PHOTO DURING A BACKPACKING EXCURSION ON ISLE ROYALE.

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CREDIT: PHOTO COURTESY OF MAURIEL RODRIQUEZ CURRAS




MADISON–In a rare opportunity to study carnivores before and after wolves were reintroduced to their ranges, researchers from the University of Wisconsin–Madison found that the effects of wolves on Isle Royale have been only temporary. And even in the least-visited national park, humans had a more significant impact on carnivores’ lives.

The paper, published recently in Frontiers in Ecology and the Environment, uses DNA from foxes and martens’ scat and hair to understand where these animals were and what they ate before wolves were reintroduced, following the first year of their reintroduction, and as they formed packs across the island.

While many studies have been conducted to understand the effects of a carnivore reintroduction on their prey, less well studied is the effect of the reintroduction on other carnivores in the same food web, in this case foxes and martens.

“We had this really amazing opportunity in Isle Royale — where we had data before this large carnivore reintroduction and then following the reintroduction of wolves — where we could look at how these effects within carnivores are taking place, and how they shift,” says Mauriel Rodriguez Curras, who completed this work as a graduate student in the lab of UW–Madison forest and wildlife ecology professor Jonathan Pauli.

                  Isle Royale is a remote island in Lake Superior and its isolated geography and limited variety of animals — including moose, beavers and squirrels — make the island a relatively simple ecosystem in which to study the complexities of carnivore reintroductions.

                  Wolves first came to Isle Royale in the 1940s, likely by means of an ice bridge that formed naturally across 15 miles of Lake Superior from Minnesota or Canada to the island. Recently, climate change has kept ice bridges from forming as often, meaning new wolves can’t cross over to Isle Royale.

While the island once had 50 wolves across several packs, by 2018 there were just two wolves left: a father daughter duo that, due to inbreeding, were also half siblings. With the goal of restoring the natural apex predator to the island and rebalancing the ecosystem, 19 wolves were introduced by the park to Isle Royale in 2019.

For this study, a typical field day involved hiking between 15 and 20 miles of trail to check traps — open PVC tubes with little brushes inside them — for hair samples and looking for scat to swab and collect. Once back at UW–Madison, Rodriguez Curras and Pauli extracted DNA from both the samples and determined which individual fox or marten it was from. By measuring ratios of carbon and nitrogen present in the samples, they could also reconstruct the animals’ diets.

From their analysis, Rodriguez Curras and Pauli categorized the effects from wolves on other carnivores into three phases: absence, establishment and coalescence. The absence phase is data the lab had collected on foxes and martens the year before wolves were reintroduced to the island.

During establishment, which included the first year of the wolves’ reintroduction, no clear territories or packs had established, and the wolves were wandering the island mostly as individuals. Foxes altered where they hung out on the island in this phase, moving away from the dense forest and closer to campgrounds.

Since foxes compete with martens for food and have been known to kill them, martens normally stick to the densely forested areas of the island where it’s easier to hide. But, with foxes shifting to other areas of the island after wolf reintroduction, martens were able to expand their distribution on the island and increase their population.

Meanwhile, foxes found themselves facing greater risk. Foxes hunt small prey, but they often rely on scavenging. Theoretically, scavenging off wolf kills is beneficial to the foxes who couldn’t easily kill prey as large as a beaver or a moose calf. But to scavenge off those kills they would also have to be in areas the wolves are regularly, elevating the risk of being killed. So, rather than contend with wolves all the time, foxes supplemented their food by sticking close to campgrounds. They leveraged their cuteness and begging and raiding skills to target an easier meal: food from human visitors.

By 2020, the wolves had coalesced into packs with defined territories. The effects of wolves on the other carnivores disappeared, and foxes and martens occupied areas and ate food similar to the absence phase.

“The rewilding of these species is an important move that conservation biologists are making to try and reweave the fabric of ecosystem function,” said Pauli who’s been studying the island for 8 years. “But I think the point is that when we do this reweaving of communities, unexpected things happen. I don’t think these are bad things, but they’re not necessarily things that we’d immediately predict.”

Another unexpected consequence was how strongly human visitors to the island could affect these species interactions. Even though Isle Royale is considered one of the most pristine wilderness areas in the country and is one of the least-visited national park, Rodriguez Curras and Pauli found that humans, and the food they bring with them, have a significant effect on the relationship between the carnivores, where they live, what they eat and how they then interact.

Rodriguez Curras and Pauli credit their partnership with the National Park Service for providing the opportunity to conduct research that can guide ongoing and future carnivore reintroduction efforts in other areas. Their work revealing the way species interact with one another and with humans also provides Isle Royale National Park with the best available science to potentially improve visitors’ experiences while preserving the island’s wilderness.

This research was supported by grants from the US National Park Service (P20AC00057, P22AC01601), the National Park Foundation, and a fellowship from University of Wisconsin–Madison SciMed Graduate Research Scholars.

---Elise Mahon, etmahon@wisc.edu