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Survey for selected parasites in Alaska brown bears (Ursus arctos)

February 10, 2023

To assess infection with or exposure to endo- and ectoparasites in Alaska brown bears (Ursus arctos), blood and fecal samples were collected during 2013–17 from five locations: Gates of the Arctic National Park and Preserve; Katmai National Park; Lake Clark National Park and Preserve; Yakutat Forelands; and Kodiak Island. Standard fecal centrifugal flotation was used to screen for gastrointestinal parasites, molecular techniques were used to test blood for the presence of Bartonella and Babesia spp., and an ELISA was used to detect antibodies to Sarcoptes scabiei, a species of mite recently associated with mange in American black bears (Ursus americanus). From fecal flotations (n=160), we identified the following helminth eggs: Uncinaria sp. (n=16, 10.0%), Baylisascaris sp. (n=5, 3.1%), Dibothriocephalus sp. (n=2, 1.2%), and taeniid-type eggs (n=1, 0.6%). Molecular screening for intraerythrocytic parasites (Babesia spp.) and intracellular bacteria (Bartonella spp.) was negative for all bears tested. We detected antibodies to S. scabiei in six of 59 (10.2%) individuals. The relatively low level of parasite detection in this study meets expectations for brown bear populations living in large, relatively undisturbed habitats near the northern edge of the range. These results provide a contemporary understanding of parasites in Alaska brown bears and establish baseline levels of parasite presence to monitor for changes over time and relative to ecologic alterations.

Publication Year 2023
Title Survey for selected parasites in Alaska brown bears (Ursus arctos)
DOI 10.7589/JWD-D-22-00070
Authors Ellen Haynes, Sarah Coker, Michael J. Yabsley, Kevin Niedrighaus, Andrew M. Ramey, Guilherme Verocai, Grant Hilderbrant, Kyle Joly, Dave Gustine, Buck Mangipane, William Leacock, Anthony P. Crupi, Christopher A. Cleveland
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Wildlife Diseases
Index ID 70240717
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center Biology WTEB