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Mass on arrival of rockhopper penguins at Marion Island correlated with breeding success
Crawford, R.J.M.; Makhado, A.B.; Upfold, L.; Dyer, B.M. (2008). Mass on arrival of rockhopper penguins at Marion Island correlated with breeding success. Afr. J. Mar. Sci. 30(1): 185-188
In: African Journal of Marine Science. NISC/Taylor & Francis: Grahamstown. ISSN 0257-7615, more
Peer reviewed article  

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  • Crawford, R.J.M.
  • Makhado, A.B.
  • Upfold, L.
  • Dyer, B.M.

Abstract
    For rockhopper penguins Eudyptes chrysocome at Marion Island, there were significant decreases over time in the numbers breeding and breeding success at three monitored colonies from 1985/1986 to 2006/2007, and in mass on arrival for breeding of both males and females from 1994/1995 to 2007/2008. Breeding success decreased by 0.15 chicks pair-1 y-1 over 22 years and was significantly correlated with mass on arrival of males and females. Survival of chicks at the guard stage was low in the late 1990s; hatching success decreased in the early 2000s. It is thought that an increasingly poor parental condition caused birds to abandon breeding at a progressively early stage. Parental condition is influenced by feeding opportunities at overwintering grounds, which have probably been altered by global climate.

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