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Title

The effects of hatching date and parental quality on chick growth and creching age in the Chinstrap penguin (Pygoscelis antarctica): a field experiment

AuthorsBarbosa, Andrés ; Moreno Klemming, Juan ; Potti, Jaime ; Merino, Santiago
Issue Date1997
PublisherOrnithological Societies of North America
CitationThe Auk 114(1):47-54, 1997
AbstractNegative effects of late breeding on chick growth and creching and fledging ages of chicks have been reported for Chinstrap Penguins (Pygoscelis antarctica). In a Chinstrap Penguin rookery on Deception Island, we experimentally tested two hypotheses to explain these effects of hatching date: (1) late breeding pairs are formed by low-quality breeders that are not able to feed their chicks efficiently and are forced to leave them unguarded at younger ages; and (2) late breeding pairs experience a conflict between properly caring for their chicks and commencing the period of premolt reserve storage. By exchanging chicks among nests hatched six days apart, we separated the effects of quality of adults (as expressed by their breeding dates) from the hatching date of chicks. We measured bill and flipper length and weighed chicks at 17 and 44 days of age, and noted the age at which chicks were left unguarded by parents. Late-hatched chicks attained smaller sizes and masses and were left unguarded at earlier ages than early-hatched chicks independent of the breeding date of the adults raising them. Also, chicks hatched on the same date but raised by adults with different breeding dates reached the same sizes and masses and were left unguarded at similar ages. Thus, seasonal changes in chick growth and creching age are related to hatching date, not to differences in parental quality
Publisher version (URL)http://elibrary.unm.edu/sora/Auk/v114n01/p0047-p0054.pdf
URIhttp://hdl.handle.net/10261/9271
ISSN0004-8038
Appears in Collections:(EEZA) Artículos
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