Does location really matter? An inter-colony comparison of seabirds breeding at varying distances from productive oceanographic features in the Bering Sea

• Main Authors: Harding, Ann, Paredes, Rosana, Suryan, Robert, Roby, Daniel, Irons, David, Orben, Rachael, Renner, Heather, Young, Rebecca, Barger, Christopher, Dorresteijn, Ine, Kitaysky, Alexander
• Format: Text
• Language: unknown
• Published: DigitalCommons@University of Nebraska - Lincoln 2013
• Subjects: Corticosterone; Diving; GPS-tracking; Prey; Provisioning; Shelf-break; Stress; Bering Sea; George Islands; Uria lomvia; uria
• Online Access: https://digitalcommons.unl.edu/usfwspubs/435; https://digitalcommons.unl.edu/context/usfwspubs/article/1434/viewcontent/Harding_DSRII_2013_Does_location_really_matter.pdf

Central place foragers, such as breeding seabirds, need to commute between their nests and foraging grounds, thus close proximity of the breeding colony to productive oceanographic features might be beneficial for seabird reproduction. We tested this hypothesis by investigating the at-sea foraging and breeding behavior of thick-billed murres (Uria lomvia) nesting at three colonies (Bogoslof, St. Paul, and St. George Islands) in the Bering Sea located at different distances from the productive continental shelf-break. We found that distances to feeding are as differed only during night trips among colonies. St. Paul murres foraged entirely on the shelf, whereas St. George murres commuted to the continental shelf-break at night and foraged on the shelf during the day. Bogoslof murres foraged in oceanic waters in close proximity to the colony.