Abstract
Four dominant nematode species and various copepods from an intertidal mudflat in Marennes-Oleron Bay were analyzed for δ 13 C and δ 15 N 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 13 C content, which can be reflected in herbivorous meiofauna, such as the nema- todes 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 δ 15 N and δ 13 C signatures differed substantially among meio-
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