Reference : Dominant amphipods of Posidonia oceanica seagrass meadows display considerable trophi...
Scientific journals : Article
Life sciences : Zoology
Life sciences : Environmental sciences & ecology
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/169617
Dominant amphipods of Posidonia oceanica seagrass meadows display considerable trophic diversity
English
Michel, Loïc mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
Dauby, Patrick mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Systématique et diversité animale >]
Gobert, Sylvie mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
Graeve, Martin [Alfred Wegener Institute Helmholtz Centre for Polar and Maritime Research, Bremerhaven, Germany > Marine Chemistry division > > > >]
Nyssen, Fabienne [Université de Liège - ULg > Département de Biologie, Ecologie & Evolution > Systématique et Diversité animale > >]
Thelen, Nicolas mailto [Université de Liège - ULg > Département des sciences de la vie > GIGA-R : Biologie cellulaire >]
Lepoint, Gilles mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
Dec-2015
Marine Ecology
Blackwell Publishing
36
4
969-981
Yes (verified by ORBi)
International
0173-9565
[en] Seagrass ; Mesograzers ; Epiphytes ; Stable isotopes ; Fatty acids ; SIAR
[en] Gut content examination and trophic markers (fatty acids, stables isotopes of C and N) were combined to delineate the diet of the dominant species of amphipods from Mediterranean Posidonia oceanica seagrass meadows and to highlight trophic diversity among this community. Our results indicate that, although all dominant species heavily relied on macroalgal epiphytes, considerable interspecific dietary differences existed. Carbon stable isotope ratios notably showed that some of the amphipod species favored grazing on epiphytes from leaves or litter fragments (Apherusa chiereghinii, Aora spinicornis, Gammarus aequicauda), while others like Dexamine spiniventris preferred epiphytes from rhizomes. The remaining amphipods (Caprella acanthifera, Ampithoe helleri and Gammarella fucicola) readily consumed both groups. In addition, SIAR modeling suggested that most species had a mixed diet, and relied on several food items. Fatty acid analysis and gut contents revealed that contribution of microepiphytic diatoms and of benthic and suspended particulate organic matter to the diet of amphipods were anecdotal. None of the examined species seemed to graze on their seagrass host (low 18:2(n-6) and 18:3(n-3) fatty acids contents), but G. aequicauda partly relied on seagrass leaf detritus, as demonstrated by the lesser 13C-depletion of their tissues. Overall, our findings suggest that amphipods, because of their importance in transfers of organic matter from primary producers and detritus to higher rank consumers, are key-items in P. oceanica associated food webs.
Centre Interfacultaire de Recherches en Océanologie - MARE
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/169617
10.1111/maec.12194

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