Isotopic Discrimination between Food and Blood and Feathers of Captive Penguins: Implications for Dietary Studies in the Wild
- Y. Cherel, K. Hobson, S. Hassani
- Environmental SciencePhysiological and Biochemical Zoology
- 1 January 2005
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.
Geographical variation in carbon stable isotope signatures of marine predators: a tool to investigate their foraging areas in the Southern Ocean
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.
NUTRITION, PHYSIOLOGY, AND STABLE ISOTOPES: NEW INFORMATION FROM FASTING AND MOLTING PENGUINS
- Y. Cherel, K. Hobson, F. Bailleul, R. Groscolas
- Biology
- 1 November 2005
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.
The importance of oceanographic fronts to marine birds and mammals of the southern oceans
- C. Bost, C. Cotté, H. Weimerskirch
- Environmental Science
- 1 October 2009
Fasting in king penguin. I. Hormonal and metabolic changes during breeding.
- Y. Cherel, J. Robin, O. Walch, H. Karmann, P. Netchitailo, Y. le Maho
- BiologyAmerican Journal of Physiology
- 1 February 1988
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.
Physiology and biochemistry of long-term fasting in birds
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.
Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean
- Y. Cherel, Camille Fontaine, P. Richard, J. Labatc
- Environmental Science
- 1 January 2010
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.
Diving Behavior and Energetics During Foraging Cycles in King Penguins
- G. Kooyman, Y. Cherel, C. A. Kooyman
- Environmental Science
- 1 February 1992
It was concluded that deep—diving, for unknown reasons, is an important component of foraging success, and diving capacities of King Penguins are remarkable compared to other birds and many pinnipeds, and calculated foraging energetics can be closely estimated from time—energy budgets.
Stable isotopes document seasonal changes in trophic niches and winter foraging individual specialization in diving predators from the Southern Ocean.
Comparison of summer and winter isotopic ratios and examining the summer diet of Antarctic and Subantarctic penguins and fur seals highlights the feeding habits of marine predators that were not previously addressed, and verifies the hypothesis that trophic niches widen when individuals are no longer central place foragers.
ALTERNATIVE FORAGING STRATEGIES AND RESOURCE ALLOCATION BY MALE AND FEMALE WANDERING ALBATROSSES
- H. Weimerskirch, Y. Cherel, I. F. Cuenot-Chaillet, V. Ridoux
- Environmental Science
- 1 October 1997
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.
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