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1 December 2018 Sea Ice Influences Habitat Type Use by Great Black-Backed Gulls (Larus marinus) in Coastal Newfoundland, Canada
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Abstract

The influence of an unusual concentration of sea ice and breeding failure on the foraging movement patterns and habitat use of Great Black-backed Gulls (Larus marinus) was investigated. GPS loggers were deployed on three incubating females when multi-year sea ice moved into foraging ranges, dividing the tracking period (1–23 June 2017) into ice-free (5–10 days) and ice-present periods (11–12 days). Foraging trip parameters (e.g., distance, duration) differed among individuals but not with ice conditions. Great Black-backed Gulls decreased use of islands when ice was present (0.05 ± 0.08 locations/trip) relative to absent (5.9 ± 0.5 locations/trip), but increased use of marine habitat when ice was present (9.4 ± 0.2 locations/trip) relative to absent (2.9 ± 0.2 locations/trip). Great Black-backed Gulls also moved at higher speeds in areas of 91–100% ice cover relative to < 50% ice cover, suggesting that low percent cover sea ice acts as important at-sea foraging/roosting sites. Additionally, two Great Black-backed Gulls that were continuously tracked during post-breeding failure repeatedly visited the colony throughout July-August, suggesting some advantage to maintaining a presence at nest sites.

Laurie D. Maynard and Gail K. Davoren "Sea Ice Influences Habitat Type Use by Great Black-Backed Gulls (Larus marinus) in Coastal Newfoundland, Canada," Waterbirds 41(4), 449-456, (1 December 2018). https://doi.org/10.1675/063.041.0415
Received: 12 April 2018; Accepted: 12 July 2018; Published: 1 December 2018
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