Abstract
Understanding the movements of seabirds, which are important ecological indicators, can provide new insights into physical and biological aspects of the marine environment. This information can also be used in planning marine conservation and oil spill response strategies. Though Black Guillemots Cepphus grylle are widely distributed in the coastal waters of eastern and arctic Canada, little is known about their movements during the non-breeding season. We used a combination of global location sensors and stable-isotope analyses on Black Guillemots breeding on Country Island, Nova Scotia, Canada and on Kent Island, New Brunswick, Canada to examine their non-breeding movements and trophic ecology in 2017–2018. Overall, the two populations dispersed an average of 157 km from their breeding colonies (max. 494 km) throughout the region, reaching areas that included the Scotian Shelf, Gulf of St. Lawrence, Bay of Fundy, and Gulf of Maine; both populations overlapped in the Bay of Fundy during the winter. Trophic levels (δ15N) and foraging locations (δ13C) differed between the colonies. Birds from Country Island foraged at higher trophic levels and in less benthic waters than Kent Island birds overall, and birds from both colonies foraged at higher trophic levels in autumn than in winter. This indicates that foraging strategies differ between Black Guillemot populations and that diet varies between seasons, even when foraging habitats do not. Our findings, combined with other seabird, fish, and marine mammal tracking studies, can inform marine management decisions in Atlantic Canada.
Original language | English |
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Pages (from-to) | 57-70 |
Number of pages | 14 |
Journal | Marine Ornithology |
Volume | 49 |
Issue number | 1 |
Publication status | Published - 2021 |
Bibliographical note
Funding Information:All animal care procedures (protocol #17RR01 and 18RR01) were approved by Environment and Climate Change Canada’s Eastern Wildlife Animal Care Committee. Thank you to Myriam Trottier-Paquet, Jessie McIntyre, and Avery Nagy-MacArthur for assisting with tag deployments and the recovery of tagged birds. For work conducted on Kent Island, we thank the students of Dalhousie University’s marine ornithology field course, Sarah Wong, Ali Gladwell, Kyle d’Entremont, and the Bowdoin Scientific Station for logistical support. Thanks to Sarah Wong for assistance with spatial analyses and Tarah Wright for insightful comments. This study was funded by Environment and Climate Change Canada’s Canadian Wildlife Service under the Oceans Protections Plan. JEB was supported at Acadia University by a scholarship from the Natural Sciences and Engineering Research Council of Canada. We appreciate the comments of two reviewers who helped us improve our paper.
Publisher Copyright:
© 2021, Marine Ornithology. All rights reserved.
ASJC Scopus Subject Areas
- Oceanography
- Animal Science and Zoology