Habitat use and sex-specific foraging behaviour of Adelie penguins throughout the breeding season in Adelie Land, East Antarctica
Background Marine predators are ecosystem sentinels because their foraging behaviour and reproductive success reflect the variability occurring in the lower trophic levels of the ecosystem. In an era of environmental change, monitoring top predators species can provide valuable insights into the zon...
| Published in: | Movement Ecology |
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| Main Authors: | , , , , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Biomed Central Ltd
2015
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| Subjects: | |
| Online Access: | https://doi.org/10.1186/s40462-015-0052-7 http://www.ncbi.nlm.nih.gov/pubmed/26392864 http://ecite.utas.edu.au/105963 |
| Summary: | Background Marine predators are ecosystem sentinels because their foraging behaviour and reproductive success reflect the variability occurring in the lower trophic levels of the ecosystem. In an era of environmental change, monitoring top predators species can provide valuable insights into the zones of ecological importance that need to be protected. In this context, we monitored the Adlie penguin ( Pygoscelis adeliae ) as a bio-indicator near Dumont dUrville, an area of the East Antarctic sector currently being considered for the establishment of a Marine Protected Area (MPA), using GPS-based tracking tags during the 2012/13 austral summer breeding season. Results The habitat use and foraging areas of the penguins differed by breeding stage and sex and were strongly associated with patterns in bathymetry and sea-ice distribution. The first trips, undertaken during the incubation phase, were longer than those during the guard phase and were associated with the northern limit of the sea-ice extent. During the guard phase, birds strongly depended on access to a polynya, a key feature in Antarctic marine ecosystem, in the vicinity of the colony. The opening of the ice-free area was synchronous with the hatching of chicks. Moreover, a sex-specific use of foraging habitat observed only after hatching suggests sex-specific differences in the diet in response to intra-specific competition. Conclusions Sea-ice features that could be affected by the climate change were important factors for the use of foraging habitat by the Adlie penguins. The extent of the foraging area observed in this study is congruent with the area of the proposed MPA. However, both penguin behavior and their environment should be monitored carefully. |
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