Differential declines among nesting habitats of breeding Herring gulls (Larus argentatus) and Great Black-backed gulls (Larus marinus) in Witless Bay, Newfoundland and Labrador, Canada

Bond, Alexander L., Wilhelm, Sabina I., Robertson, Gregory J. and Avery-Gomm, Stephanie (2016) Differential declines among nesting habitats of breeding Herring gulls (Larus argentatus) and Great Black-backed gulls (Larus marinus) in Witless Bay, Newfoundland and Labrador, Canada. Waterbirds, 39 1: 143-151. doi:10.1675/063.039.sp105


Author Bond, Alexander L.
Wilhelm, Sabina I.
Robertson, Gregory J.
Avery-Gomm, Stephanie
Title Differential declines among nesting habitats of breeding Herring gulls (Larus argentatus) and Great Black-backed gulls (Larus marinus) in Witless Bay, Newfoundland and Labrador, Canada
Formatted title
Differential declines among nesting habitats of breeding Herring gulls (Larus argentatus) and Great Black-backed gulls (Larus marinus) in Witless Bay, Newfoundland and Labrador, Canada
Journal name Waterbirds   Check publisher's open access policy
ISSN 1524-4695
1938-5390
Publication date 2016-04-01
Sub-type Article (original research)
DOI 10.1675/063.039.sp105
Open Access Status Not yet assessed
Volume 39
Issue 1
Start page 143
End page 151
Total pages 9
Place of publication Waco, TX, United States
Publisher Waterbird Society
Collection year 2017
Language eng
Formatted abstract
Environmental conditions in eastern Newfoundland have changed considerably since the 1970s, as both bottom-up oceanographic and anthropogenic influences on seabird populations have fluctuated considerably. The diet, reproductive success, and presumably survival of gulls are intrinsically linked to these processes, and breeding populations have declined considerably through the 1980s and 1990s. To assess the populations of breeding large gulls in the Witless Bay Ecological Reserve in eastern Newfoundland and Labrador, Canada, nests were surveyed and clutch size determined for Herring Gulls (Larus argentatus) and Great Black-backed Gulls (L. marinus) breeding on Great, Gull, and Pee Pee Islands in 2011-2012. The total number of breeding gulls of these two species combined decreased by 41% on Gull Island, 78% on Great Island and 51% on Pee Pee Island since 2000. However, the declines differed among habitat type, with modest declines on puffin slopes (-15% to -52%) and the steepest declines in meadows (-70% to -88%), suggesting that large-scale causative factors are not solely responsible for changes in population size. Clutch size did not differ from that in 2000. Differential recruitment among highly philopatric gulls stemming from bottom-up diet-related variation in breeding success may be responsible for different changes in populations among different habitats.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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Created: Mon, 03 Apr 2017, 12:16:46 EST by Gail Walter on behalf of School of Biological Sciences