A5037137651- Isotope Analysis in Ecology
- Marine animal studies overview
- Marine and fisheries research
- Avian ecology and behavior
- Cephalopods and Marine Biology
- Mercury impact and mitigation studies
- Genetic diversity and population structure
- Ichthyology and Marine Biology
- Fish Ecology and Management Studies
- Coral and Marine Ecosystems Studies
- Animal Nutrition and Physiology
- Marine and coastal plant biology
- Geology and Paleoclimatology Research
- Marine Bivalve and Aquaculture Studies
- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Animal Behavior and Reproduction
- Species Distribution and Climate Change
- Animal Ecology and Behavior Studies
- Arctic and Antarctic ice dynamics
- Identification and Quantification in Food
- Wildlife Ecology and Conservation
- Physiological and biochemical adaptations
- Heavy Metal Exposure and Toxicity
- Environmental DNA in Biodiversity Studies
Centre d'Etudes Biologiques de Chizé
2016-2025
Centre National de la Recherche Scientifique
2016-2025
La Rochelle Université
2014-2023
Université de Pau et des Pays de l'Adour
2021
Environment and Climate Change Canada
2006-2007
Oniris
2004
Centre de Recherche en Nutrition Humaine d'Auvergne
1996
Abstract Plastic pollution is distributed patchily around the world’s oceans. Likewise, marine organisms that are vulnerable to plastic ingestion or entanglement have uneven distributions. Understanding where wildlife encounters crucial for targeting research and mitigation. Oceanic seabirds, particularly petrels, frequently ingest plastic, highly threatened, cover vast distances during foraging migration. However, spatial overlap between petrels plastics poorly understood. Here we combine...
Various bird species regularly fast in connection with breeding, migration, or drastic climatic conditions. The metabolic response of penguins and domestic geese to fasting has been studied detail. These large birds, contrast small species, do not become torpid when they are fasting. Nevertheless, reduce their rate energy expenditure by decreasing both resting locomotor activity. From changes the loss body mass, divided into three phases: I, mass decreases; II, it remains at a minimum level;...
Stable isotopes are increasingly used in animal ecology, but little attention has been paid to the underlying physiological processes accounting for changes 15N/14N and 13C/12C ratios, example, influence of protein balance on δ15N values. We investigated a "professional" faster, King Penguin (Aptenodytes patagonicus), test effect long-term food deprivation isotopic signature tissues that can be nondestructively sampled, i.e., blood feathers. Fasting 25 days induced tissue 15N enrichment,...
Allocation processes play a central role in life history theories. Yet very few studies have been carried out on the link between foraging and context of allocation resources. Here we report study examining relationship resources Wandering Albatross Diomedea exulans Crozet Islands. We simultaneously studied individual strategies at sea differential to reproduction storage by measuring energy supplied chicks variation body mass adult. Satellite tracking continuous monitoring nest attendance...
King Penguins are the second largest of all diving birds and share with their congener, Emperor Penguins, breeding habits strikingly different from other penguins. Our purpose was to determine feeding behavior, energetics foraging prey species, compare these sympatric species subantarctic divers. We determined: (1) general features behavior using time—depth recorders, velocity meters, radio transmitters, (2) by doubly labeled water, (3) food energy content stomach lavage samples, (4) resting...
Using measurements of naturally occurring stable isotopes to reconstruct diets or source feeding requires quantifying isotopic discrimination factors the relationships between isotope ratios in food and consumer tissues. Diet-tissue carbon ((13)C/(12)C, delta (13)C) nitrogen ((15)N/(14)N, (15)N) whole blood feathers, representing noninvasive sampling techniques, were examined using three species captive penguins (king Aptenodytes patagonicus, gentoo Pygoscelis papua, rockhopper Eudyptes...
1. Climatic variation outside the breeding season affects fluctuations in population numbers of seabirds and marine mammals. A challenge identifying underlying biological mechanisms is lack information on their foraging strategies during winter, when individuals migrate far from grounds. 2. We investigated temporal variability resource partitioning within guild five sympatric Subantarctic penguins fur seals Crozet Islands. The stable isotopic ratios carbon (delta(13)C) nitrogen (delta(15)N)...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 311:157-164 (2006) - doi:10.3354/meps311157 Stable isotopes indicate sex-specific and long-term individual foraging specialisation in diving seabirds Stuart Bearhop1,*, Richard A. Phillips2, Rona McGill3, Yves Cherel4, Deborah Dawson5, John P. Croxall2 1Quercus, School of Biology & Biochemsistry, MBC, Queen's...
During long-term fasting in birds and mammals, protein utilization initially decreases (phase I), is thereafter maintained at a low value II), then further increases III). To delineate hormonal biochemical changes responsible for these modifications, the effect of food deprivation 50 days was studied 6 male king penguins captured beginning their natural breeding fast. phase II, both rate mass loss plasma uric acid concentration remained levels, whereas beta-hydroxybutyrate increased. In III...
We report the trophic structure of a myctophid assemblage by measuring isotopic niches 14 species living in Kerguelen waters, southern Indian Ocean. Most show distinct that differ at least one two niche axes (δ 13 C habitat and δ 15 N position), indicating partitioning within assemblage. Strong segregation occurs each three most common genera myctophids ( Electrona , Gymnoscopelus Protomyctophum ), illustrating different mechanisms (habitat dietary segregation) allow coexistence closely...
Cephalopods play a key role in the marine environment but knowledge of their feeding habits is limited by lack data. Here, we have developed new tool to investigate ecology combining use predators as biological samplers together with measurements stable isotopic signature beaks. Cephalopod beaks are chitinous hard structures that resist digestion and isotope ratios carbon (δ 13 C) nitrogen 15 N) indicators foraging areas trophic levels consumers, respectively. First, comparison δ C N values...
Abstract Stable isotopes are increasingly being used to trace wildlife movements. A fundamental prerequisite of animal isotopic tracking is a good knowledge spatial variations in the environment. Few accessible reference maps landscape (“isoscapes”) available for marine predators. Here, we validate first time an gradient higher trophic levels by using unique combination large number satellite‐tracks and subsequent blood plasma signatures from wide‐ranging oceanic predator. The δ 13 C 15 N...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 366:281-291 (2008) - DOI: https://doi.org/10.3354/meps07587 Resource partitioning within a tropical seabird community: new information from stable isotopes Y. Cherel1,*, M. Le Corre2, S. Jaquemet2, F. Ménard3, P. Richard4, H. Weimerskirch1 1Centre d'Etudes Biologiques de Chizé, UPR 1934 du CNRS, BP 14, 79360...
When king penguin chicks are 3–4 mo old, they enter a season of interrupted growth due to long periods fasting, because irregularly fed in winter. Nine captive [mean initial body mass (m) = 12.5 kg] had fasted an average 5 at the end experiment; m was then 4.0 kg, 68% decrease. They probably could have longer, since parents delayed return colony die from starvation 3.0 kg. The fast be divided into three based on changes rate decrease m. remarkable resistance may partly explained by their...
Seabirds are top predators of the marine environment that accumulate contaminants over a long life-span. Chronic exposure to pollutants is thought compromise survival rate and long-term reproductive outputs in these long-lived organisms, thus inducing population decline. However, demographic consequences contaminant largely theoretical because dearth datasets. This study aims test whether adult rate, return colony breeding performance were related blood mercury (Hg), cadmium (Cd) persistent...
Understanding the mechanisms that drive prey selection is a major challenge in foraging ecology. Most studies of strategies have focused on behavioural costs, and generally failed to recognize differences quality may be as important predators costs acquisition. Here, we tested whether there relationship between diets (kJ·g−1) consumed by cetaceans North Atlantic their metabolic living estimated indicators muscle performance (mitochondrial density, n = 60, lipid content, 37). We found cost 11...
Using top predators as sentinels of the marine environment, Hg contamination was investigated within large subantarctic seabird community Kerguelen Islands, a remote area from poorly known Southern Indian Ocean. Chicks 21 sympatric seabirds presented wide range concentrations, with highest contaminated species containing ∼102 times more feather than less species. Hence, encompass whole chick values that were previously collected worldwide in industrialized localities. stable isotopes,...
In vivo and in vitro evidence for detoxification of methylmercury (MeHg) as insoluble mercury selenide (HgSe) underlies the central paradigm that exposure is not or little hazardous when tissue Se molar excess (Se:Hg > 1). However, this hypothesis overlooks binding Hg to selenoproteins, which lowers amount bioavailable acts a reservoir MeHg, thereby underestimating toxicity mercury. This question was addressed by determining chemical forms various tissues giant petrels Macronectes spp. using...
Abstract Background Penguins (Sphenisciformes) are a remarkable order of flightless wing-propelled diving seabirds distributed widely across the southern hemisphere. They share volant common ancestor with Procellariiformes close to Cretaceous-Paleogene boundary (66 million years ago) and subsequently lost ability fly but enhanced their capabilities. With ∼20 species among 6 genera, penguins range from tropical Galápagos Islands oceanic temperate forests New Zealand, rocky coastlines...