Foraging strategies of Adélie penguins: adjusting body condition to cope with environmental variability
By G. Ballard, Katie M. Dugger, N. Nur, D. Ainley. 2010
90 citations recorded by the source corpus.
Animals modulate breeding effort by balancing investment in self-maintenance against investment in their young, potentially impacting reproductive success when faced with difficult con- ditions. This life history trade-off model has been evaluated for flying birds, especially those that for- age over large pelagic regions of relatively sparse prey availability. We evaluated its applicability to penguins which, lacking flight, depend on reliably available prey relatively close to colonies. We used transponders and an automated weighing system to monitor 40 to 75 breeding Adelie penguins Pygoscelis adeliae per season for 10 seasons, while environmental conditions varied dramatically, measuring foraging trip duration, parental mass change, and total food load delivered to chicks. Par- ents that lost the most mass during breeding provided more food to chicks while maintaining their own condition. In contrast, in years when adult mass was lower to begin with, parents recovered their own condition and delivered less food to chicks. Food loads were also related to environmental vari- ables, with parents making longer trips and delivering less food when access to prey was more diffi- cult, but delivering more food to 2-chick broods than to 1-chick broods. Penguins did not alternate between short (chick provisioning) and long (self-maintenance) trips, as has been observed in far- ranging seabirds. Nevertheless, our results indicate they regulated their condition depending on environmental and physiological factors, with impacts on the amount of food delivered to young and pre-fledging mass. Parental choice of multiple foraging habitats and depletion of prey in the nearest habitat due to intraspecific competition have important implications in explaining contrasting pat- terns observed among studies investigating the life history trade-off model in birds.
Subfields: Ecology, Ecology, Evolution, Behavior and Systematics, Global and Planetary Change
View Paper: https://www.semanticscholar.org/paper/9d35bd2eeea875b9d1f6653e463ee6fee0f18bba
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Citations in the corpus
- Influence of local and regional prey availability on breeding performance of African penguins Spheniscus demersus (2013, background): “For example, body condition at the onset of breeding has been shown to interact with local feeding conditions to affect breeding success and chick-provisioning behaviour in Adélie penguins Pygoscelis adeliae (a capital breeder) foraging in the Antarctic (Ballard et al. 2010) and timing and success o”
- Trophic cascades in the western Ross Sea, Antarctica: revisited (2015, methodology): “Maximum number of minke Balaenoptera bonaerensis and killer whales Orcinus orca seen in waters offshore of the Cape Crozier Adélie penguin Pygoscelis adeliae colony; observations made twice daily from a coastal hill 400 m above sea level (Ainley et al. 2006).”