Abstract
Natural areas in cities are important refugia for wildlife, but some species also use developed areas. Such adaptation may be facilitated at the ecotone between natural and residential areas where wildlife encounter anthropogenic resources. We quantified human activities and objects that potentially attract coyotes (Canis latrans) by providing shelter, food, prey habitat, and novelty items where backyards back onto natural areas in Edmonton, Canada. We related attractant abundance and human demographic variables to coyote access to backyards, scat abundance, and the number and nature of reports detailing interactions with coyotes near the ecotone. Among 468 surveyed backyards, 31% were accessed by coyotes, and we detected 2055 instances of attractants. Coyotes selectively accessed unfenced backyards with food and novelty items, and backyard access was most common along transects where fences were infrequent, and shelter was abundant. Evidence of deer on transects was weakly correlated with increased prevalence of scats. Public reports describing conflict with coyotes were more frequent in areas with more coyote access to backyards, fewer fences, and more shelter. Weak evidence indicated that food abundance, scat prevalence, and backyard access were higher in areas with larger houses and more university-educated and retired residents. These results suggest that coyotes frequently access attractants at the ecotone between natural and residential areas, which may promote habituation, food conditioning, and human-wildlife conflict. These effects could be reduced, and coexistence could be promoted with clearer boundaries separating natural and residential areas, opposing conventional recommendations for reserve design that encourage gradual transition zones.
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Data availability
Data are available upon request.
Code availability
The code developed to conduct analyses and create figures can be found at the following repository link: https://github.com/sageraymond/CoyoteEcotones
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The authors thank J. Farr for leading the classification of public reports from the Edmonton Urban Coyote Project and sharing these data.
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This work was supported by a Canada Graduate Scholarship awarded to S. Raymond by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Walter H. Johns Graduate Fellowship awarded to S. Raymond by the University of Alberta, and by an NSERC Discovery Grant (RGPIN-2017–05915) and a University of Alberta Faculty of Science Research Fellowship awarded to C. C. St. Clair.
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Both authors contributed to the study conception, design, and data collection. Material preparation, analysis, and development of the first draft were performed by Sage Raymond. Colleen Cassady St. Clair commented on previous versions of the manuscript, and both authors read and approved the final manuscript.
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Raymond, S., St. Clair, C.C. Coyotes access diverse anthropogenic attractants at the ecotone between natural and residential urban areas. Urban Ecosyst 26, 1589–1605 (2023). https://doi.org/10.1007/s11252-023-01402-3
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DOI: https://doi.org/10.1007/s11252-023-01402-3