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Food and feeding ecology of Wilson's storm petrel <i>Oceanites oceanicus</i> at South Georgia
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Food and feeding ecology of Wilson's storm petrel Oceanites oceanicus at South Georgia

Author: J P CROXALL Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET; H J HILL Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET; R LIDSTONE-SCOTT Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET; M J O'CONNELL Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET; P A PRINCE Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET
Edition/Format: Article Article : English
Publication:Journal of Zoology, v216 n1 (September 1988): 83-102
Summary:
At South Georgia, the diet of Wilson's storm petrel was studied using the regurgitates of adults arriving to feed chicks. Feeding frequency and meal size were estimated by weighing chicks twice daily, or in some cases every 3 h during daytime. Crustaceans contributed 98% of the total number of individual items and 68% of the total weight consumed; fish, 1% of the number of items and 28% of the weight. The most  Read more...
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Details

Document Type: Article
All Authors / Contributors: J P CROXALL Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET; H J HILL Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET; R LIDSTONE-SCOTT Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET; M J O'CONNELL Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET; P A PRINCE Affiliation: British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 GET
ISSN:0952-8369
Language Note: English
Unique Identifier: 5154335825
Notes: 8 December 1987
Number of References: 71
Awards:

Abstract:

At South Georgia, the diet of Wilson's storm petrel was studied using the regurgitates of adults arriving to feed chicks. Feeding frequency and meal size were estimated by weighing chicks twice daily, or in some cases every 3 h during daytime. Crustaceans contributed 98% of the total number of individual items and 68% of the total weight consumed; fish, 1% of the number of items and 28% of the weight. The most abundant crustacean was the amphipod Themisto gaudichaudii, which accounted for 90% of the total number but only 44% of the total weight of crustaceans eaten. Most (79%) of the Themisto were juveniles. Euphausiids were much less numerous in the diet (5% by number) but were the main group by weight (55%); most (52%) were Antarctic krill, with juveniles and sub-adults (25-50 mm long) predominating. Mysids, copepods and barnacle larvae were also present. Fish were all myctophids (lanternfish), Protomyctophum normani and P. bolini being identified; specimens were 50-85 mm long and weighed 1-4 g. Meal sizes averaged 6-5-7-5 g (14-22% adult body mass); about 75% of chicks were fed each day (mainly at night), about 10% probably receiving meals from both parents. A review of storm petrel diets emphasizes the importance of fish to Oceanodroma species and of crustaceans to Oceanites, Garrodia and Pelagodroma. Euphausiids and amphipods (chiefly Themisto and Hyperia) are the main crustacean prey and range from 5-50 mm and 0-005-0-7 g. Myctophids are the main fish prey and range from 20-100 mm and 1-5 g. Meal size ranges from 15-25% adult body mass and chicks are fed on 50-85% of days. This low delivery rate is mainly responsible for the disproportionately slow growth and long fledging period of storm petrel chicks.

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