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Meiofauna in river epilithic biofilm: Dynamics and trophic relationships

Majdi, Nabil. Meiofauna in river epilithic biofilm: Dynamics and trophic relationships. PhD, Functional Ecology, Université Paul Sabatier - Toulouse III, 2011, 172 p.

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The long-term dynamics of meiofauna with regards to environmental constraints was monitored in epilithic biofilms of the Garonne River, France. In addition, HPLC-analysis of nematode gut pigment content and a stable isotope multi-approach—including measurement of δ13C and δ15N natural signatures and an in situ 13C-labelling experiment—were performed to disentangle trophic interactions involving biofilm-dwelling meiofauna. Hydrological scenarios and fluctuation of microphyte availability primarily shaped the structure of the meiobenthic community. Also, possible interferences with macro-invertebrate grazers were suspected during July. Chromadorina spp. nematodes grazed non-selectively on epilithic diatom contents, while most of their diet likely derived from extra-cellular polymeric substances produced by microphytes. Freshly photosynthesized carbon was rapidly incorporated by meiofauna, although quantitatively, macrofaunal Chironomidae were the most important grazers.

Item Type:PhD Thesis
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
French department of higher education and research
Research Director:
Tackx, Michèle and Buffan-Dubau, Evelyne
Deposited On:15 Apr 2013 08:43

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