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- Title
Divergent foraging habitat preferences between summer‐breeding and winter‐breeding Procellaria petrels.
- Authors
Bentley, Lily K.; Manica, Andrea; Dilley, Ben J.; Ryan, Peter G.; Phillips, Richard A.
- Abstract
Foraging niche specialization is thought to occur when different members of speciose communities divide resources in either time or space. Here we compared habitat preferences of the congeneric Grey Petrel Procellaria cinerea and White‐chinned Petrel Procellaria aequinoctialis, tracked in the same calendar year using GPS loggers from Gough Island and Bird Island (South Georgia), respectively. We identified periods of active foraging and determined habitat characteristics using remote‐sensing data. Although these highly pelagic species could potentially overlap at sea across large areas, they showed markedly different foraging preferences during their incubation periods, which are temporally offset because Grey Petrels breed during the austral winter. Grey Petrels foraged mostly in pelagic cold‐water areas to the north‐west of South Georgia, whereas White‐chinned Petrels foraged almost exclusively in the warm, shallow waters of the Patagonian Shelf. Within each species, foraging habitat characteristics were highly consistent. Our results demonstrate the diversity of habitat preferences within genera, and provide further evidence that colony‐specific information on habitat preference is crucial to identify important feeding areas for pelagic predators.
- Subjects
SOUTH Georgia &; South Sandwich Islands; HABITAT selection; PETRELS; WINTER; WATER depth; FORAGE
- Publication
Ibis, 2023, Vol 165, Issue 2, p618
- ISSN
0019-1019
- Publication type
Article
- DOI
10.1111/ibi.13152