Food and feeding ecology of Wilson's storm petrel Oceanites oceanicus at South Georgia

Croxall, JP and Hill, J and Lidstone-Scott, R and O'Connell, Mark and Prince, P (1988) Food and feeding ecology of Wilson's storm petrel Oceanites oceanicus at South Georgia. Journal of Zoology, 216 (1). pp. 83-102. ISSN 0952-8369

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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, I% of the number of items and 28%, of the weight. The most abundant crustacean was the amphipod Thernisto gaudichaudii, which accounted for 90% of the total number but only 44% of the total weight of crustaceans eaten. Most (79%) of the Thernisto 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 Oceanodrorna 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.

Item Type: Article
Article Type: Article
Additional Information: This is the peer reviewed version of the following article: Croxall, J. P., Hill, H. J., Lidstone-Scott, R., O'Connell, M. J. and Prince, P. A. (1988), Food and feeding ecology of Wilson's storm petrel Oceanites oceanicus at South Georgia. Journal of Zoology, 216: 83–102., which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/j.1469-7998.1988.tb02417.x/full. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Subjects: Q Science > QL Zoology > QL605 Chordates. Vertebrates > QL671-699 Birds
Divisions: Schools and Research Institutes > School of Natural & Social Sciences > Environmental Sciences
Research Priority Areas: Environmental Dynamics & Governance
Depositing User: Mark O'Connell
Date Deposited: 08 Feb 2018 15:35
Last Modified: 24 Feb 2018 17:18
URI: http://eprints.glos.ac.uk/id/eprint/5308

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