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Feeding of biofilm-dwelling nematodes examined using HPLC-analysis of gut pigment content

Majdi, Nabil and Tackx, Michèle and Traunspurger, Walter and Buffan-Dubau, Evelyne Feeding of biofilm-dwelling nematodes examined using HPLC-analysis of gut pigment content. (2012) Hydrobiologia, 680 (1). 219-232. ISSN 0018-8158

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Official URL: http://dx.doi.org/10.1007/s10750-011-0920-0

Abstract

The natural feeding behaviour of the nematodes Chromadorina bioculata (Schultze in Carus 1857) and Chromadorina viridis (Linstow 1876) was studied in situ, within epilithic biofilms of the Garonne River (France). Based on their feeding-type characteristics and population dynamics, it was hypothesized that these species feed selectively on microphytobenthos (MPB) within the biofilm, and that among MPB groups, diatoms are preferred. High-performance liquid chromatography (HPLC) was used for separation, identification and quantification of pigments both in nematode guts and in the biofilm. This is the first time that nematode gut pigment contents were examined under natural conditions. Diatoms dominated the MPB which also comprised cyanobacteria and green microalgae. The comparison between chlorophyll a content in nematode guts versus in the biofilm showed that C. bioculata and C. viridis fed opportunistically (non-selectively) on MPB within the biofilm. Only diatom biomarker pigments were found in nematode guts suggesting that they could preferentially fed on diatoms. However, the non-detection of biomarker pigments for other microphyte groups could be also linked to HPLC detection limits. It was estimated that Chromadorina nematodes daily ingested on average 0.03–0.67% of the MPB standing stock. This grazing covered only a small part of their energetic requirements, suggesting that besides MPB they probably also fed on other biofilm food sources. Some considerations on the applicability of the HPLC gut pigment analysis technique for the examination of nematode feeding are also presented.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://link.springer.com/article/10.1007/s10750-011-0920-0
HAL Id:hal-00823478
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universität Bielefeld (GERMANY)
Laboratory name:
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Deposited By: Nabil Majdi
Deposited On:24 Apr 2013 14:32

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