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A global perspective on the trophic geography of sharks 5
Bird, Christopher S.; Verissimo, Ana; Magozzi, Sarah; Abrantes, Katya G.; Aguilar, Alex; Al-reasi, Hassan; Barnett, Adam; Bethea, Dana M.; Biais, Gerard; Borrell, Asuncion; Bouchoucha, Marc; Boyle, Mariah; Brooks, Edward J.; Brunnschweiler, Juerg; Bustamante, Paco; Carlisle, Aaron; Catarino, Diana; Caut, Stephane; Cherel, Yves; Chouvelon, Tiphaine; Churchill, Diana; Ciancio, Javier; Claes, Julien; Colaco, Ana; Courtney, Dean L.; Cresson, Pierre; Daly, Ryan; De Necker, Leigh; Endo, Tetsuya; Figueiredo, Ivone; Frisch, Ashley J.; Hansen, Joan Holst; Heithaus, Michael; Hussey, Nigel E.; Iitembu, Johannes; Juanes, Francis; Kinney, Michael J.; Kiszka, Jeremy J.; Klarian, Sebastian A.; Kopp, Dorothee; Leaf, Robert; Li, Yunkai; Lorrain, Anne; Madigan, Daniel J.; Maljkovic, Aleksandra; Malpica-cruz, Luis; Matich, Philip; Meekan, Mark G.; Menard, Frederic; Menezes, Gui M.; Munroe, Samantha E. M.; Newman, Michael C.; Papastamatiou, Yannis P.; Pethybridge, Heidi; Plumlee, Jeffrey D.; Polo-silva, Carlos; Quaeck-davies, Katie; Raoult, Vincent; Reum, Jonathan; Torres-rojas, Yassir Eden; Shiffman, David S.; Shipley, Oliver N.; Speed, Conrad W.; Staudinger, Michelle D.; Teffer, Amy K.; Tilley, Alexander; Valls, Maria; Vaudo, Jeremy J.; Wai, Tak-cheung; Wells, R. J. David; Wyatt, Alex S. J.; Yool, Andrew; Trueman, Clive N..
Sharks are a diverse group of mobile predators that forage across varied spatial scales and have the potential to influence food web dynamics. The ecological consequences of recent declines in shark biomass may extend across broader geographic ranges if shark taxa display common behavioural traits. By tracking the original site of photosynthetic fixation of carbon atoms that were ultimately assimilated into muscle tissues of 5,394 sharks from 114 species, we identify globally consistent biogeographic traits in trophic interactions between sharks found in different habitats. We show that populations of shelf-dwelling sharks derive a substantial proportion of their carbon from regional pelagic sources, but contain individuals that forage within additional...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00420/53141/54249.pdf
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Cost of Living Dictates what Whales, Dolphins and Porpoises Eat: The Importance of Prey Quality on Predator Foraging Strategies 5
Spitz, Jerome; Trites, Andrew W.; Becquet, Vanessa; Brind'Amour, Anik; Cherel, Yves; Galois, Robert; Ridoux, Vincent.
Understanding the mechanisms that drive prey selection is a major challenge in foraging ecology. Most studies of foraging strategies have focused on behavioural costs, and have generally failed to recognize that differences in the quality of prey may be as important to predators as the costs of acquisition. Here, we tested whether there is a relationship between the quality of diets (kJ.g(-1)) consumed by cetaceans in the North Atlantic and their metabolic costs of living as estimated by indicators of muscle performance (mitochondrial density, n = 60, and lipid content, n = 37). We found that the cost of living of 11 cetacean species is tightly coupled with the quality of prey they consume. This relationship between diet quality and cost of living appears...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00116/22749/20551.pdf
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Détection de la coelentérazine chez cinq espèces de Myctophidae du plateau des Iles Kerguelen 5
Duchatelet, Laurent; Hermans, Claire; Duhamel, Guy; Cherel, Yves; Guinet, Christophe; Mallefet, Jérôme.
Myctophidae comprise the largest biomass of mesopelagic fishes in the Southern Ocean. This family has the ability to emit light – bioluminescence – via specific organs called photophores, and from the head and caudal organs. Through biochemical analyses, this study reveals that coelenterazine is the substrate for light reaction in the five most common myctophid species from the Southern Ocean. The results also support the hypothesis of the acquisition of this molecule via the food chain and reveal the presence of two stabilised storage forms of coelenterazine (enol-sulfate and dehydrocoelenterazine) within various tissues of the studied species. Finally, detection of coelenterazine in the gonads also suggests the potential maternal transfer of the...
Tipo: Text Palavras-chave: Myctophidae; Bioluminescence; Coelenterazine; Dehydrocoelenterazine; Enol-sulfate; Biochemical assays.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00502/61405/65084.pdf
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Diatom-Specific Highly Branched Isoprenoids as Biomarkers in Antarctic Consumers 5
Goutte, Aurelie; Cherel, Yves; Houssais, Marie-noelle; Klein, Vincent; Ozouf-costaz, Catherine; Raccurt, Mireille; Robineau, Camille; Masse, Guillaume.
The structure, functioning and dynamics of polar marine ecosystems are strongly influenced by the extent of sea ice. Ice algae and pelagic phytoplankton represent the primary sources of nutrition for higher trophic-level organisms in seasonally ice-covered areas, but their relative contributions to polar marine consumers remain largely unexplored. Here, we investigated the potential of diatom-specific lipid markers and highly branched isoprenoids (HBIs) for estimating the importance of these two carbon pools in an Antarctic pelagic ecosystem. Using GC-MS analysis, we studied HBI biomarkers in key marine species over three years in Adelie Land, Antarctica: euphausiids (ice krill Euphausia crystallorophias and Antarctic krill E. superba), fish (bald...
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Ano: 2013 URL: https://archimer.ifremer.fr/doc/00296/40756/39750.pdf
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Impacts of climatic anomalies on provisioning strategies of a Southern Ocean predator 5
Lea, Mary-anne; Guinet, Christophe; Cherel, Yves; Duhamel, Guy; Dubroca, Laurent; Pruvost, Patrice; Hindell, Mark.
The large temporal and spatial variability in marine productivity encountered by marine predators may negatively influence breeding success. The Antarctic fur seal Arctocephalus gazella (AFS), a marine predator in the Southern Ocean (SO) ecosystem with a circumpolar distribution, exhibits a short, 4 mo lactation coinciding with increased summer marine productivity. The diet of AFS, and the distance to significant and productive oceanographic features, such as the Antarctic Polar Frontal Zone (PFZ), varies considerably between populations. We studied the foraging activity, foraging efficiency and the pup provisioning strategies of lactating AFS at a key breeding site in the southern Indian Ocean, the Kerguelen Archipelago. Foraging parameters were examined...
Tipo: Text Palavras-chave: Antarctic fur seal; Polar front; Pinniped; ENSO; Foraging; Growth; Diving; Seabird; Myctophid; Maternal care.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/00247/35847/34356.pdf
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Mercury isotopes as tracers of ecology and metabolism in two sympatric shark species 5
Le Croizier, Gaël; Lorrain, Anne; Sonke, Jeroen E.; Jaquemet, Sébastien; Schaal, Gauthier; Renedo, Marina; Besnard, Lucien; Cherel, Yves; Point, David.
In coastal ecosystems, top predators are exposed to a wide variety of nutrient and contaminant sources due to the diversity of trophic webs within coastal areas. Mercury contamination could represent an additional threat to shark populations that are declining worldwide. Here we measured total mercury, carbon and nitrogen isotopes as well as mercury isotopes in two co-occurring shark species (the bull shark Carcharhinus leucas and the tiger shark Galeocerdo cuvier) and their prey from a coastal ecosystem of the western Indian Ocean (La Réunion Island), to (i) determine their main trophic Hg source and (ii) better characterize their diet composition and foraging habitat. Hg isotope signatures (Δ199Hg and δ202Hg) of shark prey suggested that bull sharks were...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00633/74465/74289.pdf
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Micronekton distributions and assemblages at two shallow seamounts of the south-western Indian Ocean: Insights from acoustics and mesopelagic trawl data 5
Annasawmy, Pavanee; Ternon, Jean-francois; Cotel, Pascal; Cherel, Yves; Romanov, Evgeny V.; Roudaut, Gildas; Lebourges-dhaussy, Anne; Ménard, Fréderic; Marsac, Francis.
Micronekton distributions and assemblages were investigated at two shallow seamounts of the south-western Indian Ocean using a combination of trawl data and multi-frequency acoustic visualisation techniques. La Pérouse (∼60 m) seamount is located on the outskirts of the oligotrophic Indian South Subtropical Gyre province with weak mesoscale activities and low primary productivity all year round. The “MAD-Ridge” seamount (thus termed in this study; ∼240 m) is located in the productive East African Coastal (EAFR) province with high mesoscale activities to the south of Madagascar. This resulted in higher micronekton species richness at MAD-Ridge compared to La Pérouse. Resulting productivity at MAD-Ridge seamount was likely due to the action of mesoscale...
Tipo: Text Palavras-chave: Micronekton; Seamount; South-western Indian Ocean; Acoustics; Seamount-associated fauna.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00510/62135/66368.pdf
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Micronektonic fish species over three seamounts in the southwestern Indian Ocean 5
Cherel, Yves; Romanov, Evgeny V.; Annasawmy, Pavanee; Thibault, Delphine; Ménard, Frédéric.
Taxonomic composition, abundance and biological features of micronektonic fish were investigated using pelagic trawls conducted near and over the summits of three seamounts located in the western Indian Ocean (La Pérouse, MAD-Ridge and Walters Shoal). Mesopelagic fish from three families accounted for 80% by number of the total catch (5714 specimens, 121 taxa), namely myctophids (59%), gonostomatids (12%) and sternoptychids (9%). Whereas the gonostomatid Sigmops elongatus was the most abundant species around La Pérouse seamount, myctophids were the most diverse and dominant group by number in all three studied areas. Most myctophids were high-oceanic species, which included the numerically dominant Benthosema suborbitale, Ceratoscopelus warmingii, Diaphus...
Tipo: Text Palavras-chave: Ceratoscopelus warmingii; Diaphus suborbitalis; Sigmops elongatus; Lanternfish; Tropical waters.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00614/72658/71904.pdf
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