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Yves Le Bras |
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2017 |
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109 |
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8044 |
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Author |
Yves Cohen |
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2011 |
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1135 |
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yes |
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178 |
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Author |
Yves Cohen |
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2010 |
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1135 |
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2675 |
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Author |
Yves Cherel, Pierrick Bocher |
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Title |
Diet of the soft-plumaged petrel (Pterodroma mollis) at Kerguelen Islands and a review of the food of gadfly petrels (Pterodroma spp.) worldwide |
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Journal |
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Year |
2022 |
Publication |
Marine Biology |
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Volume |
169 |
Issue |
2 |
Pages |
31 |
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Keywords |
Fish Food Myctophidae Procellariiformes Seabirds Southern Ocean Squid Tropics |
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Abstract |
Little is known on the food and feeding ecology of the soft-plumaged petrel Pterodroma mollis, which is the single gadfly petrel Pterodroma spp. with a circumpolar breeding distribution within the Southern Ocean. Our primary goal was to describe its diet at Kerguelen Islands, which is the southernmost breeding locality of the species. Soft-plumaged petrels fed on fish (71% by mass), and secondarily on crustaceans (22%), while cephalopods (7%) and other items (<?1%) were minor dietary components. Eight-hundred and sixty prey were identified from the pooled 33 food samples, with the 2 hyperiid amphipods Cyllopus magellanicus (48%) and Themisto gaudichaudii (35%) being the main food items by number. Owing to their larger size than crustaceans, mesopelagic fishes were the main prey by mass, with myctophids being the most important fish family in terms of both abundance (68% of the fish) and diversity (10 species). Prey distribution indicated that soft-plumaged petrels foraged primarily in oceanic subantarctic waters to feed their chicks. The oceanic life style of gadfly petrels was then highlighted by a review of their diet worldwide (20 species, 26 studies). Gadfly petrels prey mainly upon mesopelagic fishes (chiefly myctophids) and squids with their relative proportions depending on species and localities. Crustaceans are minor food items for tropical species, but they form a significant part of the food of the small- and medium-sized petrels that live in temperate and cold waters. The review underlines the need for more well-designed investigations on this globally endangered group of seabirds, since dietary information is available for only 57% of the 35 species of gadfly petrels. |
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109 |
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1432-1793 |
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yes |
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8340 |
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Author |
Yves Cherel, Karine Delord, Christophe Barbraud, Henri Weimerskirch |
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Title |
Diet, isotopic niche, and spatial distribution of the white-headed petrel (Pterodroma lessonii) at Kerguelen Islands |
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Year |
2022 |
Publication |
Polar Biology |
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Volume |
45 |
Issue |
11 |
Pages |
1607-1621 |
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Keywords |
Fish Food Myctophidae Procellariiformes Seabirds Southern ocean Squid |
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109 |
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1432-2056 |
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yes |
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8567 |
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Title |
Feeding ecology, isotopic niche, and ingestion of fishery-related items of the wandering albatross Diomedea exulans at Kerguelen and Crozet Islands |
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Journal |
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Year |
2017 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
565 |
Issue |
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Pages |
197-215 |
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Keywords |
Cephalopod Diet Hook Satellite tracking Seabird Southern Ocean Stable isotopes |
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Abstract |
Feeding ecology and isotopic niche of the wandering albatross Diomedea exulans were investigated in the poorly studied population on the Kerguelen Islands and compared to that on the Crozet Islands. Fish (48% by mass) and cephalopods (46%) were similarly important in chick food at Kerguelen, while cephalopods (87%) dominated the diet at Crozet. Fish prey included mainly deep-sea species, with the Patagonian toothfish Dissostichus eleginoides being the main item. Cephalopod beaks were identified, most of which were from adult oceanic squids. Albatrosses preyed upon the same taxa at both localities, but in different proportions. Histioteuthis atlantica (30% by number), Galiteuthis glacialis (13%), and Kondakovia longimana (10%) were the main squid prey at Kerguelen, while K. longimana (35%) and H. eltaninae (23%) dominated at Crozet. Chick feather ?15N values were higher in wandering albatrosses than in other oceanic seabirds of the 2 communities, indicating that the wandering albatross is an apex consumer together with the sperm whale and sleeper shark that have similar ?15N values. Satellite-tracked wandering albatrosses foraged in local subantarctic waters and farther north, with some Crozet birds overlapping with those from the Kerguelen population in western Kerguelen waters. Anthropogenic items (e.g. plastic fragments, hooks) were found in half the food samples. All fishery-related items were from the local toothfish fishery. The high number of hooks from Crozet indicated the presence of a fairly large number of illegal longliners in the area during the Austral winter 1998. A review of the feeding habits of Diomedea spp. highlights the need for more dietary investigations to achieve effective conservation and management of this endangered group of charismatic seabirds. |
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109 |
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ISSN |
0171-8630, 1616-1599 |
ISBN |
0171-8630, 1616-1599 |
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yes |
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Call Number |
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Serial |
6635 |
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| Permanent link to this record |
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Author |
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Title |
Feeding ecology, isotopic niche, and ingestion of fishery-related items of the wandering albatross Diomedea exulans at Kerguelen and Crozet Islands |
Type |
Journal |
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Year |
2017 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
565 |
Issue |
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Pages |
197-215 |
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Keywords |
Cephalopod Diet Hook Satellite tracking Seabird Southern Ocean Stable isotopes |
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Abstract |
Feeding ecology and isotopic niche of the wandering albatross Diomedea exulans were investigated in the poorly studied population on the Kerguelen Islands and compared to that on the Crozet Islands. Fish (48% by mass) and cephalopods (46%) were similarly important in chick food at Kerguelen, while cephalopods (87%) dominated the diet at Crozet. Fish prey included mainly deep-sea species, with the Patagonian toothfish Dissostichus eleginoides being the main item. Cephalopod beaks were identified, most of which were from adult oceanic squids. Albatrosses preyed upon the same taxa at both localities, but in different proportions. Histioteuthis atlantica (30% by number), Galiteuthis glacialis (13%), and Kondakovia longimana (10%) were the main squid prey at Kerguelen, while K. longimana (35%) and H. eltaninae (23%) dominated at Crozet. Chick feather ?15N values were higher in wandering albatrosses than in other oceanic seabirds of the 2 communities, indicating that the wandering albatross is an apex consumer together with the sperm whale and sleeper shark that have similar ?15N values. Satellite-tracked wandering albatrosses foraged in local subantarctic waters and farther north, with some Crozet birds overlapping with those from the Kerguelen population in western Kerguelen waters. Anthropogenic items (e.g. plastic fragments, hooks) were found in half the food samples. All fishery-related items were from the local toothfish fishery. The high number of hooks from Crozet indicated the presence of a fairly large number of illegal longliners in the area during the Austral winter 1998. A review of the feeding habits of Diomedea spp. highlights the need for more dietary investigations to achieve effective conservation and management of this endangered group of charismatic seabirds. |
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109 |
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ISSN |
0171-8630, 1616-1599 |
ISBN |
0171-8630, 1616-1599 |
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yes |
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Serial |
7153 |
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Title |
Micronektonic fish species over three seamounts in the southwestern Indian Ocean |
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Year |
2020 |
Publication |
Deep Sea Research Part II: Topical Studies in Oceanography |
Abbreviated Journal |
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Volume |
176 |
Issue |
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Pages |
104777 |
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Keywords |
Lanternfish Tropical waters |
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109 |
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ISSN |
0967-0645 |
ISBN |
0967-0645 |
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yes |
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Call Number |
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Serial |
8073 |
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| Permanent link to this record |
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Title |
Cephalopod prey of light-mantled sooty albatross Phoebetria palpebrata, resource partitioning amongst Kerguelen albatrosses, and teuthofauna of the southern Indian Ocean |
Type |
Journal |
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Year |
2023 |
Publication |
Deep Sea Research Part I: Oceanographic Research Papers |
Abbreviated Journal |
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Volume |
198 |
Issue |
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Pages |
104082 |
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Keywords |
Antarctica Bio-indication Procellariiformes Seabirds Southern Ocean Squids Stable isotopes |
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Abstract |
The cephalopod diet of the light-mantled sooty albatross Phoebetria palpebrata was determined for the first time at the subantarctic Kerguelen Islands by sorting ?7000 accumulated beaks from 66 regurgitated boluses. Twenty-two taxa were identified, including four dominant squid species that are all endemic to the Southern Ocean: Galiteuthis glacialis (49.8% of the lower beaks) Psychroteuthis glacialis (18.5%), Martialia hyadesi (16.2%) and Moroteuthopsis longimana (6.9%). Beak ?13C values indicated that all adult P. glacialis, almost all juvenile M. longimana, and most adult G. glacialis were caught in Antarctic waters, while albatrosses preyed upon juvenile M. hyadesi in subantarctic waters. Comparative analysis of lower beaks accumulated in food samples of Kerguelen albatrosses showed that the four main sympatric albatross species segregate primarily by species-specific foraging grounds. Light-mantled sooty albatross feed on the Antarctic P. glacialis, wandering albatross Diomedea exulans on subantarctic and subtropical histioteuthids (41.4%), and grey-headed albatross Thalassarche chrysostoma and black-browed albatross T. melanophris on subantarctic ommastrephids (69.3% and 65.7%, respectively), with black-browed albatross also preying upon neritic endemic octopuses (17.6%). Cephalopod prey of Kerguelen albatrosses highlight the abundance and importance of some squids in the functioning of the pelagic ecosystem of the southern Indian Ocean, such as ommastrephids, M. longimana, P. glacialis, Histioteuthis atlantica, H. eltaninae, and G. glacialis. Based on the diet of the light-mantled sooty albatross, P. glacialis appears common in high-Antarctic waters of the southern Indian Ocean, whereas the poorly known Psychroteuthis sp. B (Imber) is evidently present in Antarctic waters south of the Kerguelen Islands. |
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109 |
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ISSN |
0967-0637 |
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yes |
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8532 |
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| Permanent link to this record |
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Title |
Accumulate or eliminate? Seasonal mercury dynamics in albatrosses, the most contaminated family of birds |
Type |
Journal |
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Year |
2018 |
Publication |
Environmental Pollution |
Abbreviated Journal |
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Volume |
241 |
Issue |
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Pages |
124-135 |
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Keywords |
Antarctica Feathers Foraging Methylmercury Moult Seabirds Southern ocean Stable isotopes |
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Abstract |
Albatrosses (Diomedeidae) are iconic pelagic seabirds whose life-history traits (longevity, high trophic position) put them at risk of high levels of exposure to methylmercury (MeHg), a powerful neurotoxin that threatens humans and wildlife. Here, we report total Hg (THg) concentrations in body feathers from 516 individual albatrosses from 35 populations, including all 20 taxa breeding in the Southern Ocean. Our key finding is that albatrosses constitute the family of birds with the highest levels of contamination by Hg, with mean feather THg concentrations in different populations ranging from moderate (3.8??g/g) to exceptionally high (34.6??g/g). Phylogeny had a significant effect on feather THg concentrations, with the mean decreasing in the order Diomedea?>?Phoebetria?>?Thalassarche. Unexpectedly, moulting habitats (reflected in feather ?13C values) was the main driver of feather THg concentrations, indicating increasing MeHg exposure with decreasing latitude, from Antarctic to subtropical waters. The role of moulting habitat suggests that the majority of MeHg eliminated into feathers by albatrosses is from recent food intake (income strategy). They thus differ from species that depurate MeHg into feathers that has been accumulated in internal tissues between two successive moults (capital strategy). Since albatrosses are amongst the most threatened families of birds, it is noteworthy that two albatrosses listed as Critical by the World Conservation Union (IUCN) that moult and breed in temperate waters are the most Hg-contaminated species (the Amsterdam and Tristan albatrosses). These data emphasize the urgent need for robust assessment of the impact of Hg contamination on the biology of albatrosses and they document the high MeHg level exposure of wildlife living in the most remote marine areas on Earth. |
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0269-7491 |
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0269-7491 |
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yes |
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7113 |
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