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Incubation capacity limits clutch size in south polar skuas

Published online by Cambridge University Press:  11 September 2009

Jeong-Hoon Kim*
Affiliation:
Division of Polar Biology and Oceanography, Korea Polar Research Institute, Songdo-dong 7-50, Yeonsu-gu, Incheon 406-840, South Korea
Hyun Park
Affiliation:
Division of Polar Biology and Oceanography, Korea Polar Research Institute, Songdo-dong 7-50, Yeonsu-gu, Incheon 406-840, South Korea
Eun Jung Choy
Affiliation:
Division of Polar Biology and Oceanography, Korea Polar Research Institute, Songdo-dong 7-50, Yeonsu-gu, Incheon 406-840, South Korea
In-Young Ahn
Affiliation:
Division of Polar Biology and Oceanography, Korea Polar Research Institute, Songdo-dong 7-50, Yeonsu-gu, Incheon 406-840, South Korea
Jeong-Chil Yoo
Affiliation:
Korea Institute of Ornithology and Department of Biology, Kyung-Hee University, Seoul 130-701, South Korea

Abstract

The incubation-limitation hypothesis suggests that clutch size in some birds is limited by incubation capacity. However, this remains disputed amongst ornithologists. This study aimed to test whether incubation capacity limits the maximum clutch size to two eggs in south polar skuas (Catharacta maccormicki Saunders) by comparing the egg and nest temperatures as well as hatchability between two-egg and three-egg clutches. Although the vast majority of clutches contained one or two eggs, four naturally occurring three-egg clutches were found at Barton Peninsula, King George Island over three breeding seasons (2004–2005, 2005–2006 and 2006–2007). Regardless of clutch size, all incubating parents exhibited two discernible brood patches. The mean egg and nest temperatures of the three-egg clutches were significantly lower than were those of the two-egg clutches. The accumulated time that egg temperature decreased below 30°C in three-egg clutches was approximately eight times longer than that in two-egg clutches. The hatchability of natural one-egg (89.5%) and two-egg clutches (95.4%) were significantly higher than that of the three-egg clutches, which was zero. Our results suggest that the maximum clutch size in south polar skuas is probably restricted by incubation capacity.

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2009

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