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Behaviour of the Pomarine Skua Stercorarius pomarinus Temm. with Comparative Remarks on Stercorariinae

Malte Andersson
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 4, No. 1 (1973), pp. 1-16
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3676285
Stable URL: http://www.jstor.org/stable/3676285
Page Count: 16
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Behaviour of the Pomarine Skua Stercorarius pomarinus Temm. with Comparative Remarks on Stercorariinae
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Abstract

Behaviour of Pomarine Skuas was studied in Alaska. Food mainly consisted of Brown Lemmings, hunted by birds perching on mounds, or flying 3-10 m high, with 1-3 second hovering bouts. Skuas caught and handled prey with the bill only, and pursued lemmings in burrows by tearing the roof. Calls included a long call sequence and two alarm calls. The long call was associated with Wing-raising and Oblique displays, in flying birds with Slow Wing-beat display and V-gliding. Displays were used in territorial defence towards skuas and gulls, alarm calls towards other predators. Comparison with other skuas shows that displays and calls are similar to those of the Great Skua S. skua. This and other evidence indicate closer affinities between these species than was previously supposed.

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