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Foraging range and feeding locations of shags Phalacrocorax aristotelis during chick rearing.

Wanless, S.; Harris, M. P.; Morris, J. A.. 1991 Foraging range and feeding locations of shags Phalacrocorax aristotelis during chick rearing. Ibis, 133 (1). 30-36. 10.1111/j.1474-919X.1991.tb04806.x

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Abstract/Summary

We used radio-tracking techniques to determine the foraging range and feeding locations used by individual Shags Phalacrocorax aristotelis during chick rearing on the Isle of May, Scotland. The mean (±s.d.) foraging range was 7.o±1.9 km (maximum 17 km) and there were no significant sex or year differences. All feeding sites were within 7 km of land. Most (> 90%) were either within 2 km of the colony or in two discrete areas 5–13 km to the north and west. Use of the areas varied between years with both males and females making more use of the north area in 1987 than either 1988 or 1989. Birds used > 11% of the area of sea within the maximum recorded feeding range. This restricted distribution appeared to be related to water-depth and bottom sediment type. Shags fed most frequently in water 21–40 m deep, with a bottom of either gravel and sand, or rock with thin patchy sediment cover.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1474-919X.1991.tb04806.x
Programmes: CEH Programmes pre-2009 publications > Other
CEH Sections: _ Pre-2000 sections
ISSN: 0019-1019
Additional Keywords: Shags, Phalacrocorax aristotelis, Isle of May
NORA Subject Terms: Zoology
Date made live: 13 Oct 2008 10:13
URI: http://nora.nerc.ac.uk/id/eprint/4537

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