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Isotopic Discrimination between Food and Blood and Feathers of Captive Penguins: Implications for Dietary Studies in the Wild
TLDR
The results indicate that there is no need to remove lipids before isotopic analysis of avian blood and that great care must be taken in the choice of isotopic discrimination factors to apply to wild species for which no controlled experiments on captive individuals have been done. Expand
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
The importance of oceanographic fronts to marine birds and mammals of the southern oceans
TLDR
This review examines the relative importance to apex predators of the different frontal zones in terms of spatial distribution and carbon flux; 2) the processes that determine their preferential use; and 3) how the mesoscale dynamics of frontal structures drive at-sea foraging strategies of these predators. Expand
Physiology and biochemistry of long-term fasting in birds
TLDR
The metabolic response of penguins and domestic geese to fasting has been studied in detail and it is shown that large birds, in contrast to small species, do not become torpid when they are fasting. Expand
Fasting in king penguin. I. Hormonal and metabolic changes during breeding.
TLDR
It is suggested that protein sparing (phase II) requires low levels of corticosterone, insulin, and thyroid hormones, whereas the further increase in protein utilization (phase III) is due to an increase in plasma cortic testosterone. Expand
NUTRITION, PHYSIOLOGY, AND STABLE ISOTOPES: NEW INFORMATION FROM FASTING AND MOLTING PENGUINS
TLDR
The King Penguin was investigated to test the effect of long-term food deprivation on the isotopic signature of tissues that can be nondestructively sampled, i.e., blood and feathers, and 15N enrichment was higher in tissues with high protein turnover rates than in those with low turnover rates. Expand
Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids
  • Y. Cherel, K. Hobson
  • Biology, Medicine
  • Proceedings of the Royal Society B: Biological…
  • 7 August 2005
TLDR
The stable isotopic signature of beaks accumulated in predators' stomachs revealed new trophic relationships and migration patterns and is a powerful tool to investigate the role of the poorly known cephalopods in the marine environment. Expand
ALTERNATIVE FORAGING STRATEGIES AND RESOURCE ALLOCATION BY MALE AND FEMALE WANDERING ALBATROSSES
TLDR
Although Wandering Albatrosses are able to provision their chicks at a rapid rate because of the proximity of an abundant resource, birds still have to forage far from the colony to restore their body condition and estimates of energy yield explain this paradox. Expand
Distribution of trace elements in the tissues of benthic and pelagic fish from the Kerguelen Islands.
TLDR
Results for Cd in fish tissues are consistent with the hypothesis of Cd-enrichment in the polar food webs typically explained by essential elements depletion, and low Cu concentrations in fish livers might indicate low availability of this essential element in these sub-Antarctic waters. Expand
Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean
TLDR
The isotopic niche of myctophids indicates that Aptenodytes patagonicus (king penguin) adults prey upon K. anderssoni when they feed for themselves, thus exemplifying the usefulness of isotopic datasets on potential prey of predators to depict trophic relationships. Expand
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