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Title: Fatty acid composition of the amphipod Dikerogammarus villosus: Feeding strategies and trophic links
Authors: Maazouzi, Chafik
Masson, Gérard
Izquierdo, Maria Soledad 
Pihan, Jean Claude
UNESCO Clasification: 251092 Acuicultura marina
Keywords: Aquatic ecosystems
Dikerogammarus villosus
Fatty acids
Feeding ecology
Gammarids, et al
Issue Date: 2007
Publisher: 1095-6433
Journal: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology 
Abstract: Fatty acid (FA) compositions were determined for the invader amphipod Dikerogammarus villosus collected from July to September 2002, in an overheated, high-conductivity dammed reservoir in north-eastern France. Predominant fatty acids were the polyunsaturated fatty acids (PUFA): eicosapentaenoic acid (EPA), linoleic acid (LA), arachidonic acid (ARA), linolenic acid (LNA) together with the monounsaturated fatty acid 18:1ω9 and the saturated fatty acid 16:0. FA markers indicated that available food was constituted of incompletely degraded phytodetritus and terrestrial inputs, as well as animal remains. PUFA contents depended on the diet and the capacity of animals to desaturate and elongate LNA and LA in long chain PUFA as EPA and ARA respectively. Based on their FA compositions, we showed that gammarids represent naturally-occurring freshwater sources of essential PUFA, and could play a fundamental role in pelagic–benthic coupling and energy recycling in the ecosystem. The complexity of the feeding strategies of D. villosus — detritivorous, omnivorous, carnivorous — makes this species efficient at exploiting different components of the available food and may be a key factor in its high invasive success.
ISSN: 1095-6433
DOI: 10.1016/j.cbpa.2007.02.010
Source: Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology [ISSN 1095-6433], v. 147, p. 868-875
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