How to translate text using browser tools
12 January 2022 What makes elk tick: winter tick (Dermacentor albipictus) grooming behavior in wild elk (Cervus canadensis)
Jacalyn Normandeau, Colleen Cassady St. Clair, Susan J. Kutz, Mark Hebblewhite, Evelyn H. Merrill
Author Affiliations +
Abstract

Ungulates groom to remove ectoparasites but grooming may interfere with foraging, vigilance, and rumination, and it is possible that these effects differ among migratory tactics due to differences in parasite infestations. We compared the effects of grooming for winter ticks (Dermacentor albipictus) on winter foraging behavior by migrating and resident elk (Cervus canadensis) in the partially migratory population at the Ya Ha Tinda, adjacent to Banff National Park, Canada. We used hair loss on the dorsal shoulder area (“withers”) measured from photographic images as an index of tick infestation of individual elk. We conducted 594 focal observations on 48 radio-collared and 18 uncollared individuals that were uniquely identifiable from ear-tags (N = 66) in 2019 to assess whether grooming for ticks in winter reduced time spent foraging, ruminating, or being vigilant. Because rubbing or hair loss from radio-collars may influence tick infestations and behavior, we controlled for whether elk were collared or uncollared in our analyses. Neck hair loss was 3–5% greater in collared elk than uncollared elk, but neither withers hair loss nor time spent grooming differed. Grooming occurred during 42% of the observations but grooming comprised only ∼1% of observation time. Nevertheless, 40% of all grooming was observed during resting, and grooming interrupted vigilance behavior ∼8 times more than foraging. We found no differences among elk following different migratory tactics in time spent grooming or in other behaviors, but one of the two groups of migrant elk had higher withers hair loss. Our results suggest winter ticks may have slight effects on elk relative to other ungulates, particularly moose (Alces alces), in North America.

Jacalyn Normandeau, Colleen Cassady St. Clair, Susan J. Kutz, Mark Hebblewhite, and Evelyn H. Merrill "What makes elk tick: winter tick (Dermacentor albipictus) grooming behavior in wild elk (Cervus canadensis)," Journal of Mammalogy 103(2), 373-382, (12 January 2022). https://doi.org/10.1093/jmammal/gyab155
Received: 25 July 2020; Accepted: 18 November 2021; Published: 12 January 2022
KEYWORDS
ectoparasite
foraging
hair loss
migration
vigilance
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top