Prevalence of three-chick nests in Adelie Penguins Pygoscelis adeliae at Cape Crozier, Ross Island

Marine Ornithology: Journal of Seabird Research and Conservation
By: , and 

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Abstract

In 2017/18, we recorded multiple instances of Adelie Penguin Pygoscelis adeliae nests containing three chicks at Cape Crozier, Ross Island, Antarctica. In one sub-colony, 0.67 % of nests had three chicks, or two chicks and one egg. We found that some Adelie Penguin pairs were willing to brood three chicks, as well as chicks that were not their own. Many factors could lead to supra-normal clutches and broods, including foreign eggs added to a nest, adoption of chicks belonging to other parents, and double-yolked eggs. In order to understand the true cost of colonial breeding in large Adelie Penguin colonies and to assess the source of chicks or eggs in supra-normal clutches and broods, we conclude that future studies should examine the frequency of supra-normal clutches and broods and analyze the genetics of chicks within sub-colonies. 

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Publication type Article
Publication Subtype Journal Article
Title Prevalence of three-chick nests in Adelie Penguins Pygoscelis adeliae at Cape Crozier, Ross Island
Series title Marine Ornithology: Journal of Seabird Research and Conservation
Volume 47
Issue 1
Year Published 2019
Language English
Publisher Marine Ornithology
Contributing office(s) Coop Res Unit Seattle
Description 4 p.
First page 77
Last page 80
Other Geospatial Antarctica, Ross Island
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