Spatial foraging segregation by close neighbours in a wide-ranging seabird.

Ceia, Filipe R., Paiva, Vitor H., Ceia, Ricardo S., Hervias, Sandra, Garthe, Stefan, Marques, Joao C. and Ramos, Jaime A. (2015) Spatial foraging segregation by close neighbours in a wide-ranging seabird. Oecologia, 177 (2). pp. 431-440. DOI 10.1007/s00442-014-3109-1.

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Breeding seabirds are central-place foragers and therefore exploit food resources most intensively nearer their colonies. When nesting aggregations are close to one another density-dependent competition is likely to be high, potentially promoting foraging segregation (i.e. neighbouring colonies may segregate to search for food in different areas). However, little is known about spatial segregation in foraging behaviour between closely adjacent colonies, particularly in species that are wide-ranging foragers. Here, we tested for foraging segregation between two sub-colonies of a wide-ranging seabird, Cory's shearwater Calonectris borealis, separated by only 2 km, on a small Island in the North Atlantic. During the 2010 chick-rearing period, 43 breeding adults of both sexes were simultaneously sampled at both sub-colonies. A GPS logger was deployed on each individual and removed after several foraging trips at sea. Blood samples (plasma and red blood cells) were collected from each tracked individual for stable isotope analysis. Results indicated partial spatial segregation between the two sub-colonies during local foraging trips (i.e. those of a parts per thousand currency sign1 day duration and 216 km from the colony) accounting for 84.2 % of all trips recorded. The location of the breeding sub-colony influenced the direction of travel of birds during local trips resulting in sub-colony-specific foraging areas. Although the oceanographic conditions associated with the foraging range of the two sub-colonies differed, no differences were found in the habitat exploited and in their estimated diets. This suggests that birds concentrated their feeding activity in patches of similar habitat and prey during the chick-rearing period.

Document Type: Article
Additional Information: Times Cited: 3
Keywords: Calonectris, Diet, GPS tracking, Individual specialization, Stable isotopes
Research affiliation: Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s00442-014-3109-1
ISSN: 0029-8549
Projects: Future Ocean
Date Deposited: 20 Oct 2016 10:58
Last Modified: 23 Sep 2019 19:32

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