
L.A. coyotes less likely to spend time in wealthy areas in their home range, study finds
Lush greenery and abundant wildlife — attributes of many affluent L.A. neighborhoods that lure people — would seemingly be draws for predators like coyotes too.
But a new study found coyotes were less inclined to seek out higher-income areas in their home ranges, preferring to stick to less-wealthy parts, surprising researchers.
While affluent ZIP Codes may have more wild prey and places of refuge, the people who live in those areas 'also tend to harbor more unfavorable and separationist views on coyotes,' according to the study from UC Berkeley and UC Agriculture and Natural Resources, positing a possible explanation.
People in affluent neighborhoods have shown heightened support for killing the animals and hazing is more common in wealthy areas, reports the study that was published Tuesday in the journal 'Ecology Letters.'
Researchers cited several studies to support the idea that people in affluent areas may view coyotes differently, including one from last year that used fieldwork in L.A. and conversations collected from the online application Nextdoor to theorize about how internet discourse on the animals leads to real-world ramifications 'in the increasingly contentious coyote debates' in L.A. and elsewhere.
Another study cited from 2023 analyzing a decade of coyote reports in San Francisco found that higher median income was correlated with with negative opinions of the polarizing animals.
Some means of getting rid of coyotes, like trapping, can be costly, according to the new study.
'In the less-resourced areas, people aren't hiring trappers as much as in the wealthier areas,' said Christine Wilkinson, lead author of the study and a recent postdoctoral researcher at UC Berkeley. 'So we're kind of wondering, is that because these are places coyotes are aware of removal? Or aware of these threats?'
The finding is among several results researchers say were unexpected from the paper exploring the impacts of societal wealth and ecological health on the canids' movement using tracking data from 20 coyotes primarily roaming in Los Angeles County. Researchers behind the new study say the takeaways can help guide urban planners and conservationists in building wildlife-friendly cities.
The study joins a growing body of research focused on how societal factors shape animal behavior, an approach that some believe provides more accurate insights than exploring ecological factors alone.
Coyotes tracked in the study had larger home ranges in areas with more pollution, higher population density and lower income compared with those in areas the researchers describe as less burdened. Researchers said it appeared the animals, known for resiliency, traveled farther afield to get what they need — likely expending more energy along the way.
Coyotes in more polluted and densely populated areas were also more likely to venture into city parks, suggesting they may be risking human interaction for grub and potentially spots to den because their pickings are slim, researchers said.
Urban parks can offer a steady stream of trash and rats that are attracted to that trash, Wilkinson noted.
Meanwhile, the study found that coyotes throughout the county were less interested in cemeteries and golf courses, which are often identified as important places for wildlife in urban ecology literature, according to Wilkinson. In those places, trash is routinely picked up and vegetation might be cut in a way to reduce hiding spots, she said, suggesting a potential explanation for the finding.
'Coyotes are one of the most adaptable carnivores, but their movement patterns really reflect broader urban inequities,' said Wilkinson, now a research associate with the California Academy of Sciences in San Francisco. 'So I think we can use coyotes as a lens for thinking about how we can make cities better for both people and wildlife.'
Movement data from the study came from 20 coyotes — six females and 14 males — that were outfitted with satellite tracking collars for another study that never came to fruition.
The main method employed to see where the mesopredators were choosing to go compared actual location points gleaned from their collars to a random set of points in their home range. The broad picture of what they were doing was broken down further by levels of pollution, wealth, population density and other variables.
'We took all 20 of our coyotes and we looked at who has a pollution burden above the mean pollution burden for these coyotes and who has a pollution burden below, and we compared what they were doing differently within their home ranges,' Wilkinson said, providing an example.
Researchers also examined how fast the coyotes moved as well as turn angles to provide a sense of their fine-scale movement across the landscape in addition to their overall habitat preferences.
The size of the home range — which was defined as where the coyotes spent 95% of their time — varied significantly between animals. One female had a home range that was less than a square kilometer, while another female's range straddling L.A. and San Bernardino counties spanned 114 square kilometers.
Niamh Quinn, human-wildlife interactions advisor at UC Agriculture and Natural Resources and study co-author, said the study findings underscore the need to start looking at wildlife in different ways.
Many movement studies look only at ecological factors, but people and animals are affected by the same things, she said.
'People are affected by unhealthy communities, and it seems like coyotes potentially may also [be],' she said.
There are also some potential practical ramifications. Residents living in more polluted neighborhoods may need to take more precautions for keeping their pets safe, Quinn said.
Cats, rats and rabbits are believed to be coyotes' preferred mammalian prey, she said.
While the study focused on where the coyotes did and didn't go, Quinn said coyotes are practically everywhere in L.A. County. More reports of coyote activity come from wealthy areas, but those reports aren't necessarily indicative of their population level there, she said.
'We have parts of the city of L.A. that have absolutely no reports, and it's not because there are not coyotes there,' she said. 'It's because the people there have other things to think about.'
The prevalence of coyotes means Angelenos are bound to run into them — whether it's during a hike in Griffith Park or a stroll through East Hollywood. They tend to elicit strong emotions, Quinn said, loosely categorized as love or hate. Conflict between humans and the wild canids is difficult to manage, she said.
Sometimes the tensions pit humans against one another, too.
Last year, California wildlife officials investigated a coyote trapper employed by Torrance and other cities for possible violation of state law at the urging of animal welfare activists.
Trapping and killing coyotes in urban settings is contentious but not uncommon.
People for the Ethical Treatment of Animals, which set the investigation in motion, has also petitioned for statewide regulations that would ban gassing coyotes and prohibit cities from contracting with private trappers who work on public land.
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The study set out to show if its cohort of LMHRs were developing fatty deposits known as plaque in their arteries, a known risk for people with high levels of LDL cholesterol in their blood. Participants were followed for one year, during which they continued with their keto diets, and their plaque levels were observed at the beginning and end of the study. One of the study's authors is Dave Feldman, a software engineer and entrepreneur without a medical license or training, who has devoted himself to all things keto and cholesterol. In an email to WIRED, Feldman claimed that it was he who coined the term Lean Mass Hyper-Responders, back in 2017. In the past he has organized his own experiments—without the guidance of an institutional board review, which in formal experiments are used to ensure ethical behavior and participant welfare—to try to get the attention of scientists and have them study LMHRs. Feldman's charity, the Citizen Science Foundation, crowdfunded the recent study, which was run through the Californian research organization the Lundquist Institute, with an institutional review board. In a video released on X the day the paper came out, Feldman claimed the study found no association between LDL cholesterol and plaque in the patients, and no association between apolipoprotein B (ApoB) and plaque. (ApoB helps carry fat molecules around the body, and higher levels of it are associated with cardiovascular disease.) These alleged findings run counter to large amounts of already-existing evidence suggesting both LDL and ApoB have a causal relationship with the development of plaque in the arteries. In Feldman's view, the study shows that despite their high levels of LDL cholesterol, the patients' keto diets weren't raising their risk of plaque. However, many doctors and researchers reached the opposite conclusion when looking at the work. On May 7, JACC: Advances published a pre-proof version of a Letter to the Editor, written by two researchers specializing in nutrition, Miguel López-Moreno and José Francisco López-Gil. They highlighted concerns with the study, including what they alleged to be 'selective reporting' of data, the study's lack of a comparator group, the validity of the statistical modeling used, and the weakness of using a one-year timeframe. The study was also heavily criticized for seeming to mask its original focus. Originally, it was supposed to look at the percentage change in non-calcified plaque volume (NCPV)—soft plaque that had not yet hardened inside participants' blood vessels—in the participants over the course of the study. A graph of NCPV change appeared in the paper, but measurements were not provided or mentioned. Instead, the paper ended up offering an exploratory analysis—that ApoB does not beget plaque—'that was implausible to do based on the data they had,' says Spencer Nadolsky, a Michigan-based physician specializing in obesity medicine and lipidology. This means the paper 'shouldn't have made it through peer review in the first place,' Nadolsky believes. If researchers leave out the intended goal of a study, critics allege that they could then cobble together any data once the experiment has been done, without clarifying what they were initially looking for, and try to pass this off as evidence of something. Because the study wasn't designed to investigate the alternative hypothesis of the explanatory analysis, there may be flaws in the data being used to support it—biases in how it was obtained, or not enough of it to reach a robust conclusion. 'This is the first thing you're not supposed to do,' says Nadolsky of the decision to shift focus. 'That's why we're hammering them.' 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Nadolsky, though, has called for the paper to be retracted, and co-wrote a response to the research, which has been released as a preprint, which takes issue with the paper's findings, interpretation, and statistical analysis, among other concerns. The response says the study's conclusions—a 'clear example of scientific spin'—are not supported by the data, and have the potential to misinform both doctors and patients about the risks of following a high-fat diet. 'Nothing was spun, and our conclusions remained unchanged after multiple sensitivity analyses and an independent expert data analysis review,' says Soto-Mota. Problems from the Beginning What sets Nadolsky's criticism apart from others' is that he had a part in designing the study. Feldman and Nadolsky had gone back-and-forth for years online about the risks of high cholesterol, with Feldman suggesting that the traditional consensus around its risks might be wrong, particularly for the LMHR population. Instead, Feldman proposed a new alternative theory—the lipid energy model—which he and some of his coauthors on the current paper outlined in a study published in Metabolites in 2022. In this unproven theory, high LDL is thought to be unconcerning in LMHRs because their bodies have become more efficient in transporting cholesterol while running primarily on fat. Nadolsky, though a believer in the consensus view on cholesterol, was still interested in getting some data on the effects of LDL cholesterol in LMHRs, and a study investigating Feldman's theory was a way to reach across the aisle to get it. But in putting together a study to test Feldman's hypothesis they faced difficulty, Nadolsky explains. It would be shot down by an institutional review board, as it would require people with extremely high LDL cholesterol levels to go untreated, when this is known to be potentially dangerous. However, a workaround would be to observe plaque progression in people experiencing diet-induced hypercholesterolemia (high LDL cholesterol due to their keto diet) who were refusing lipid-lowering medications. The recruitment and promotion of the study was done on X via the #LMHRstudy hashtag, in addition to Feldman's LMHR Facebook group, which also called for fundraising contributions—and it was during this process that Nadolsky began to grow concerned. During recruitment, Feldman also presented some of the preliminary data at a low-carb conference, using it 'to try to present that the [LMHR] phenotype was benign, because most of the individuals seemed to not have plaque at baseline,' Nadolsky says. He says that Feldman was doing this to recruit more subjects and donations for the research; but in essence, this was presenting supposed findings of the research before it had been properly conducted. At this point, Nadolsky conferred with multiple scientists and researchers outside of the study, and was advised to wash his hands of the project. 'It was clear there was going to be a spin, no matter what the data showed,' Nadolsky claims. Nadolsky filed a complaint with the institutional review board overseeing the study, for ethical concerns. The board, says Soto-Mata, 'allowed the study to proceed after concluding that no ethical transgressions had been made.' The Lundquist Institute did not respond to a request for comment from WIRED. While the study was still in the recruitment phase, Nadolsky left the team. Entrenched Positions Klatt, of UC Berkeley, is extremely well-versed in nutrition research and the current online debates around cholesterol. He's written about this study and its fallout on his personal Substack, and calls Nadolsky a friend. Klatt discussed the study with Nadolsky while it was ongoing, and many aspects concerned him. Klatt brought up issues of undisclosed biases to the Lundquist Institute, the host of the trial, along with Dave Feldman's 'strongly vested interest' in the results of the study that was not properly disclosed, claiming he was 'a conflicted party with no training in the biomedical sciences.' His email to the Institute about these issues went unanswered. 'I think this study has gotten to the point of being extremely unethical,' Klatt says. 'All authors adhered to the conflicts-of-interest disclosure guidelines the journal required,' Soto-Mata says. 'Our study was independently reviewed, approved, and monitored by an expert Research Ethics committee, all its recommendations were followed, and all its standards were met.' While some researchers and physicians are tearing the study apart, or using it to show that keto can have adverse effects, Klatt doesn't draw any strong conclusions. 'People are talking past each other,' he says. Generally speaking, there are two clear camps, with one thinking the traditional lipid hypothesis holds up, and another thinking the new lipid energy model might work. Klatt puts himself in a third camp, asking: 'Why are we trying to interpret this study at all?' 'I'm an editor at the American Journal of Clinical Nutrition,' Klatt says, 'and I would like to believe that we would have rejected this outright without even sending it out for peer review, because it has so many obvious issues.' He is worried about people using this flawed study as proof the consensus on the risks of LDL cholesterol has been 'debunked,' which it has not. One of the study's coauthors, Matthew Budoff, a professor of medicine at UCLA as well as an investigator at the Lundquist Institute, acknowledged in an email to WIRED that there had been 'incredible scrutiny of the data on social media, which is more than expected based on my prior publications.' He noted the research team is seeking to have the paper incorporate corrections, but that this is ultimately at the discretion of the journal. A response to the Letter to the Editor from the coauthors clarifies some of the issues, he wrote. That reply to the Letter to the Editor has now been published—and reveals that the study's data may support the conventional position on the risk of cholesterol after all. The study's authors share that the 'pooled median change' in NCPV in the participants—the rise in the type of plaque the study was set up to investigate, but which originally wasn't explicitly quantified in the paper—was an alarming 42.8 percent. The reply goes on to state that the study's findings were 'compatible with a causal role of ApoB in atherosclerosis'—the build-up of fat in the arteries—which they've 'acknowledged and supported in previous publications.' The letter says that not mentioning this percentage increase in NCPV 'was a sincere oversight, not intentional selective reporting.' But this concession comes after the horse has bolted. Feldman's hypothesis is already appearing in laypeople's research—with the keto diet having been among the most Googled diets in recent years, and keto products a growing multibillion-dollar industry. Answering the query 'What is special about Lean Mass Hyper-Responders,' ChatGPT provides the lipid energy model, Feldman's argument against the consensus on cholesterol, among the initial explanations for why there is so much controversy and interest. There is also a Cholesterol Code documentary in the works—which covers Feldman's personal experience and his research, including this study—which Feldman predicts will be available on a major streaming service sometime this year.