Stable isotopes document seasonal changes in trophic niches and winter foraging individual specialization in diving predators from the Southern Ocean.

@article{Cherel2007StableID,
  title={Stable isotopes document seasonal changes in trophic niches and winter foraging individual specialization in diving predators from the Southern Ocean.},
  author={Y. Cherel and K. Hobson and C. Guinet and C. Vanp{\'e}},
  journal={The Journal of animal ecology},
  year={2007},
  volume={76 4},
  pages={
          826-36
        }
}
1. Climatic variation outside the breeding season affects fluctuations in population numbers of seabirds and marine mammals. A challenge in identifying the underlying biological mechanisms is the lack of information on their foraging strategies during winter, when individuals migrate far from their breeding grounds. 2. We investigated the temporal variability in resource partitioning within the guild of five sympatric Subantarctic penguins and fur seals from Crozet Islands. The stable isotopic… Expand
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References

SHOWING 1-10 OF 62 REFERENCES
Geographical variation in carbon stable isotope signatures of marine predators: a tool to investigate their foraging areas in the Southern Ocean
TLDR
The study shows that the δ13C values of marine predators are efficient indicators of the foraging habitats at various spatial scales, both in terms of latitude in oceanic waters, and in Terms of inshore/offshore gradients in waters surrounding subantarctic islands. Expand
Diet and foraging areas of Southern Ocean seabirds and their prey inferred from stable isotopes: review and case study of Wilson's storm-petrel
TLDR
Analysis of stable isotope ratios in animal tissues has emerged as a powerful tool for determining the trophic level and composition of prey and foraging location and indicated a shift in diet from mainly crustaceans during egg formation to an increased proportion of fish during chick-feeding and moulting. Expand
Stable isotope evidence of diverse species-specific and individual wintering strategies in seabirds
TLDR
This study is the first to show such striking between-population heterogeneity in individual wintering strategies, which could have important implications for likely demographic responses to environmental perturbation. Expand
Foraging habitat and food intake of satellite-tracked king penguins during the austral summer at Crozet Archipelago
TLDR
The foraging strategy of king penguins during the summer favors displacements toward frontal zones where food availability is optimal, and seems to be related to the foraging success during the first phase of the trip. Expand
Stable isotopes indicate sex-specific and long-term individual foraging specialisation in diving seabirds
TLDR
Stable isotope ratios in blood and feathers were used to infer trophic and habitat specialisations among 4 diving seabird taxa to investigate foraging specialisation and assess whether social dominance or differences in foraging preferences explained the observed patterns. Expand
Differences in foraging strategy and maternal behaviour between two sympatric fur seal species at the Crozet Islands
TLDR
The results suggest that Antarctic fur seals tend to respond to the higher needs of their pups by having a higher foraging efficiency and concentrating their foraging activity in the most productive areas. Expand
Seasonal changes in diets of seabirds in the North Water Polynya: a multiple-indicator approach
TLDR
This study highlights the seasonal nature of prey availability and seabird diets in the polynya, as well as the utility of simultaneously using conventional stomach content analysis and stable isotope and fatty acid analyses to infer dietary patterns in marine food webs. Expand
Diet, provisioning and productivity responses of marine predators to differences in availability of Antarctic krill
TLDR
The results show a coherent, though complex, pattern of within and between species similarities and differences that mainly reflect the degree of dependence on krill, the feasibility of taking alternative prey and constraints on trip duration and/or meal size imposed by foraging adaptations. Expand
Dietary differentiation and trophic relationships in the sub-Antarctic penguin community at Marion Island
TLDR
It is considered that prey availability in the apparently distinct feeding zones to explain most of the differences in the diets of the 4 species of penguins at Marion Island and the daily population food requirements of the respective penguin species at the Prince Edward Islands increased. Expand
Geographic variation in the foraging behaviour, diet and chick growth of rockhopper penguins
TLDR
Diving strategies together with food loads and chick growth rates suggest that prey availability was low at AMS, intermediate at CRO and high at KER, which is in agreement with previous data on chlorophyll concentrations and zooplankton biomass. Expand
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