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Stable isotope analysis position of intertidal of food source and trophic nematodes and copepods ArchiMer
Rzeznik Orignac, J; Boucher, G; Fichet, Denis; Richard, P.
Four dominant nematode species and various copepods from an intertidal mudflat in Marennes-Oleron Bay were analyzed for delta C-13 and delta N-15 ratios together with their potential food source, the microphytobenthos. It was shown that microphytobenthic C is passed to nematodes either by grazing or predation on herbivorous meiofauna by other nematodes. Diatoms of different sizes exhibited different C-13 content, which can be reflected in herbivorous meiofauna, such as the nematodes Daptonema oxycerca and Metachromadora remanei and the bulk of copepods, indicating they can select different sizes of diatoms. Results confirm the need to analyze meiofauna feeding habits at the species or genera level since the delta N-15 and delta C-13 signatures differed...
Tipo: Text Palavras-chave: Stable isotopes; Marennes Oleron; Mudflat; Food web; Benthic diatoms; Microphytobenthos; Meiofauna; Copepods; Nematodes.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4292.pdf
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Evolution du meiobenthos des sables fins sublittoraux de la baie de Morlaix de 1972 a 1982 ArchiMer
Boucher, G.
Nematode and copepod densities were monitored for five years after the Amoco Cadiz oil spill and compared with two years pre-pollution data. Nematode density significantly decreases from the second post-spill year on whereas copepodes abundancy remains stable. Nematode species composition changes were followed using multivariate analysis. Alteration of the structure of the community is progressive but long-lasting, even five years later. Five species groups are considered as characterizing the ecosystem evolution.
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Ano: 1983 URL: http://archimer.ifremer.fr/doc/00246/35770/34283.pdf
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