Anticoagulant rodenticides are widely used in urban areas to control rodent pests and are responsible for secondary poisoning in many nontarget wildlife species. We tested the livers of five coyotes (Canis latrans) in the Denver Metropolitan Area, Colorado, US, for anticoagulant rodenticides. All five livers were positive for brodifacoum, with values ranging from 95 ppb to 320 ppb, and one liver was positive for bromadiolone, with a value of 885 ppb. Both of these rodenticides are second-generation anticoagulants, which are more potent and more likely to cause secondary poisoning than first-generation anticoagulants due to their accumulation and persistence in the liver. We concluded that exposure to these rodenticides may have caused the death of at least two of the five coyotes, and urban coyotes in our study area are commonly exposed to rodenticides.
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http://dx.doi.org/10.7589/2014-04-116 | DOI Listing |
J Anim Ecol
January 2025
University of Florida, Department of Wildlife Ecology and Conservation, Gainesville, Florida, USA.
Invasive predators pose a substantial threat to global biodiversity. Native prey species frequently exhibit naïveté to the cues of invasive predators, and this phenomenon may contribute to the disproportionate impact of invasive predators on prey populations. However, not all species exhibit naïveté, which has led to the generation of many hypotheses to explain patterns in prey responses.
View Article and Find Full Text PDFEcology
December 2024
Wildlife Research and Monitoring Section, Ministry of Natural Resources and Forestry, Peterborough, Ontario, Canada.
Animals within social groups respond to costs and benefits of sociality by adjusting the proportion of time they spend in close proximity to other individuals in the group (cohesion). Variation in cohesion between individuals, in turn, shapes important group-level processes such as subgroup formation and fission-fusion dynamics. Although critical to animal sociality, a comprehensive understanding of the factors influencing cohesion remains a gap in our knowledge of cooperative behavior in animals.
View Article and Find Full Text PDFJ Parasitol
December 2024
Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, Pennsylvania 16802.
During a survey for Sarcocystis infections in Pennsylvania in wild canids, muscles from the tongue and limb were examined microscopically for sarcocysts. Between 9 February 2024 and 11 February 2024, muscle samples were collected from 76 coyotes, 46 gray foxes, and 21 red foxes from Pennsylvania hunter harvested animals. Around 5 g of muscle was examined microscopically by compression between a glass slide and coverslip.
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December 2024
U.S. Geological Survey, New York Cooperative Fish and Wildlife Research Unit, Department of Natural Resources and the Environment, Cornell University, Ithaca, New York, USA.
Sci Adv
December 2024
Department of Genetics and Biochemistry and Center for Human Genetics, Clemson University, Clemson, SC, USA.
Large canids (wolves, dogs, and coyote) and people form a close relationship in northern (subarctic and arctic) socioecological systems. Here, we document the antiquity of this bond and the multiple ways it manifested in interior Alaska, a region key to understanding the peopling of the Americas and early northern lifeways. We compile original and existing genomic, isotopic, and osteological canid data from archaeological, paleontological, and modern sites.
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