Top predators and stable isotopes document the cephalopod fauna and its trophic relationships in Kerguelen waters ...

Information on the poorly known but ecologically important cephalopod fauna of Subantarctic islands was collected using fishery bycatches, together with published data from oceanographic cruises and top predators (fishes and seabirds) as biological samplers. Overall, the cephalopod fauna from Kergue...

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Bibliographic Details
Main Authors: Cherel, Yves, Gasco, Nicolas, Duhamel, Guy
Format: Article in Journal/Newspaper
Language:unknown
Published: Cybium 2011
Subjects:
Online Access:https://dx.doi.org/10.26028/cybium/2011-35sp-010
http://sfi-cybium.fr/fr/top-predators-and-stable-isotopes-document-cephalopod-fauna-and-its-trophic-relationships-kerguelen
Description
Summary:Information on the poorly known but ecologically important cephalopod fauna of Subantarctic islands was collected using fishery bycatches, together with published data from oceanographic cruises and top predators (fishes and seabirds) as biological samplers. Overall, the cephalopod fauna from Kerguelen Islands includes at least 38 different species. Oegopsid squids dominate the assemblage over octopods (31 and 6 taxa, respectively), with one species of sepiolid occurring over the shelf. This rich community includes a large diversity of pelagic squids, four benthopelagic cirrate octopods and two endemic benthic octopodids. The results emphasize the importance of ommastrephids, onychoteuthids, cranchiids and a few other squid species in the nutrition of top consumers in the Southern Ocean. The trophic structure of the community of cephalopods (n = 18 representative species) was subsequently investigated by using the stable isotopic signature of their chitinized beaks. δ13C values demonstrated that cephalopods ...