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Distribution of chronic wasting disease
Cervids susceptible to chronic wasting disease (CWD) are sympatric with multiple other animal species that can interact with infectious prions. Several reports have described the susceptibility of other species to CWD prions, or their potential to transport them. One of these species is the coyote (Canis latrans), which has been previously shown to pass transmission-relevant prion titers in their feces for at least three days after ingesting prion-positive brain material. The current study followed up on these findings and evaluated the distribution of prions in multiple tissues from the same coyotes. Our results show that prions persist in the digestive tract of prion-exposed coyotes five days after exposure. Moreover, prion seeding activity was identified in other tissues, including lymph nodes and lungs. These results provide additional information about the dynamics of CWD prions in the environment and show the initial fate of prions after ingestion by a canid species that is a carnivorous predator and scavenger.
Journal Article
Your neighbor the coyote
Discusses the coyote's behavior, habits, ability to adapt to urban environments and to live alongside humans.
Book
Coyotes living near cities are bolder: implications for dog evolution and human-wildlife conflict
Abstract
How animal populations adapt to human modified landscapes is central to understanding modern behavioural evolution and improving wildlife management. Coyotes (Canis latrans) have adapted to human activities and thrive in both rural and urban areas. Bolder coyotes showing reduced fear of humans and their artefacts may have an advantage in urban environments. We analysed the reactions of 636 coyotes to novel human artefacts (camera traps) at 575 sites across the state of North Carolina. Likelihood of a coyote approaching the camera increased with human housing density suggesting that urban coyotes are experiencing selection for boldness and becoming more attracted to human artefacts. This has implications for both human-wildlife conflict and theories of dog domestication. We also note physical traits in coyotes that could be the result of domestication-related selection pressures, or dog hybridization.
Journal Article
Watch out for coyotes!
Readers will learn facts about coyotes, including anatomy, behavior, and its interactions with humans.
Book
Genetic and Anatomical Determinants of Olfaction in Dogs and Wild Canids
Understanding the anatomical and genetic basis of complex phenotypic traits has long been a challenge for biological research. Domestic dogs offer a compelling model as they demonstrate more phenotypic variation than any other vertebrate species. Dogs have been intensely selected for specific traits and abilities, directly or indirectly, over the past 15,000 years since their initial domestication from the gray wolf. Because olfaction plays a central role in critical tasks, such as the detection of drugs, diseases, and explosives, as well as human rescue, we compared relative olfactory capacity across dog breeds and assessed changes to the canine olfactory system to their direct ancestors, wolves, and coyotes. We conducted a cross-disciplinary survey of olfactory anatomy, olfactory receptor (OR) gene variation, and OR gene expression in domestic dogs. Through comparisons to their closest wild canid relatives, the gray wolf and coyote, we show that domestic dogs might have lost functional OR genes commensurate with a documented reduction in nasal morphology as an outcome of the domestication process prior to breed formation. Critically, within domestic dogs alone, we found no genetic or morphological profile shared among functional or genealogical breed groupings, such as scent hounds, that might indicate evidence of any human-directed selection for enhanced olfaction. Instead, our results suggest that superior scent detection dogs likely owe their success to advantageous behavioral traits and training rather than an “olfactory edge” provided by morphology or genes.
Journal Article
Coyotes after dark
\"Describes the habits and nature of coyotes at night\"-- Provided by publisher.
Book
Wolves-coyotes-foxes: a cascade among carnivores
Due to the widespread eradication of large canids and felids, top predators in many terrestrial ecosystems are now medium-sized carnivores such as coyotes. Coyotes have been shown to increase songbird and rodent abundance and diversity by suppressing populations of small carnivores such as domestic cats and foxes. The restoration of gray wolves to many parts of North America, however, could alter this interaction chain. Here we use a 30-year time series of wolf, coyote, and fox relative abundance from the state of Minnesota, USA, to show that wolves suppress coyote populations, which in turn releases foxes from top-down control by coyotes. In contrast to mesopredator release theory, which has often considered the consequence of top predator removal in a three-species interaction chain (e.g., coyote-fox-prey), the presence of the top predator releases the smaller predator in a four-species interaction chain. Thus, heavy predation by abundant small predators might be more similar to the historical ecosystem before top-predator extirpation. The restructuring of predator communities due to the loss or restoration of top predators is likely to alter the size spectrum of heavily consumed prey with important implications for biodiversity and human health.
Journal Article
Wolves and coyotes
\"Thick fur. Thin face or wide face. Long howls or short yips. Is it a wolf or a coyote? Learn how these beautiful wild creatures are alike and how they differ.\"-- Provided by publisher.
Book
Urban coyotes select cryptic den sites near human development where conflict rates increase
The establishment of coyote (Canis latrans) populations in urban areas across North America has been accompanied by increased rates of human–coyote conflict. One factor thought to promote physical conflict between coyotes and people or pets is the presence of coyote pups near natal dens; however, this idea has not been tested, and no multivariate study of den selection within cities has occurred. Our objectives were to conduct a multivariate analysis of third- (i.e., home range) and fourth-order (i.e., den sites) habitat selection at dens and determine whether proximity to dens is associated with reports of physical conflict with coyotes. We found 120 dens by following coyote trails using snow tracking within urban green spaces that comprise presumed high-quality habitat for coyotes in Edmonton, Alberta, Canada. We used resource selection functions to assess habitat selection for dens, testing variables related to land cover and anthropogenic features at the third order, and testing microsite habitat features via paired sites at the fourth order. We defined conflict encounters from comments in a community reporting database and used general linear models to assess their spatial proximity to the nearest den and prevalence during the pup-rearing period compared to the rest of the year. Habitat selection was strongest at the fourth order, wherein coyotes selected for abundant hiding cover, steep slopes, and eastern exposure. The prevalence of physical conflict with coyotes increased during the pup-rearing period. Conflict also increased near known dens as an overall effect and when reports occurred outside of naturalized urban areas. These results suggest that coyotes in Edmonton den in green spaces near human development in microsites that minimize detection by people via steep slopes and dense vegetation. We suggest urban wildlife managers increase public safety education about recognition of coyote denning habitat and coyote defensive behaviors, especially outside of naturalized urban areas, because of the observed increase in physical conflict near dens.
Journal Article