ORBi: Michel Loïc - Use of C & N stable isotopes to evaluate interspecific trophic diversity among amphipods from Posidonia oceanica meadows

Reference : Use of C & N stable isotopes to evaluate interspecific trophic diversity among amphipods...


	Document type :	Scientific congresses and symposiums : Poster
	Discipline(s) :	Life sciences : Aquatic sciences & oceanology Life sciences : Environmental sciences & ecology
	To cite this reference:	http://hdl.handle.net/2268/7658

Title :	Use of C & N stable isotopes to evaluate interspecific trophic diversity among amphipods from Posidonia oceanica meadows
Language :	English
Author, co-author :	Michel, Loïc [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Systématique et diversité animale >]
	Lepoint, Gilles [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
	Nyssen, Fabienne [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Systématique et diversité animale >]
	Gobert, Sylvie [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
	Dauby, Patrick [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Systématique et diversité animale >]
Publication date :	27-Jan-2009
Page number :	A0
On invitation :	No
Audience :	International
Event name :	ASLO Aquatic Sciences Meeting 2009
Event date :	du 25 janvier 2009 au 30 janvier 2009
Event organizer :	ASLO (Advancing the Science of Limnology and Oceanography)
Event place (city) :	Nice
Event country :	France
Keywords :	[en] Posidonia ; Trophic ecology ; Amphipods
Abstract :	[en] Amphipods are one of the most diverse and abundant taxa of vagile invertebrates associated to Mediterranean Posidonia oceanica meadows. Therefore, they likely play an essential part in those ecosystems’ functioning, notably in organic matter transfers from producers to higher level consumers. Nevertheless, their trophic ecology remains poorly known, and they are generally regarded as epiflora grazers or generalist detritivores. Here, we focused on interspecific trophic diversity, and on the importance of other food sources (epifauna, Posidonia leaves & litter, suspended organic matter, …) in those amphipod’s diet. To achieve these goals, we used C and N stable isotopes ratios as trophic tracers. We noticed considerable trophic diversity among amphipods from different species, with δ13C values ranging from -16 to -26 ‰. Moreover, while some species (such as Apherusa chiereghinii and Aora spinicornis) seem to feed mainly on epiphytes, others, like Dexamine spiniventris, exploit other food sources. This study enhances the comprehension of the feeding ecology of these amphipods, and therefore of the way they interact with the Posidonia meadow ecosystem.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Université de Liège
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/7658
Other URL :	http://www.aslo.org/nice2009/

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