Reference : The role of meiofauna in energy transfer in a Mediterranean seagrass bed (Calvi, Corsica
Scientific congresses and symposiums : Poster
Life sciences : Aquatic sciences & oceanology
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/87777
The role of meiofauna in energy transfer in a Mediterranean seagrass bed (Calvi, Corsica
English
Mascart, Thibaud mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Lepoint, Gilles mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Borges, Alberto mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Darchambeau, François mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Dauby, Patrick mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Systématique et diversité animale >]
De Troch, Marleen mailto [Ghent University - UGent > Biology > Marine Biology > >]
22-Oct-2010
A0
No
International
17th Benelux Congress of Zoology
From 22-10-2010 to 23-10-2010
The Royal Belgian Zoological Society (Prof. Dr. D. Adriaens)
Gent
Belgium
[en] Meiofauna ; Seagrass ; Phytodetritus ; Stable Isotopes ; Harpacticoid copepods ; Food web ; Community composition ; Stareso
[en] Meiofaunal communities of the endemic Mediterranean seagrass, <u> Posidonia oceanica </u>, were sampled in five different habitats characterised by different degradation level of macrophytodetritus. In term of abundance, harpacticoid copepods represent half of the community followed by nematodes and polychaetes. Two meiofauna communities were distinguished: (1) a benthic community of meiofauna, living in the sediment or on highly fragmented macrophytodetritus, and (2) a foliar, epiphytal community associated with seagrass leaves and low fragmented macrophytodetritus leaves. They differed significantly in their harpacticoid copepod family composition. The benthic community consisted mainly of families like Tisbidae and Miraciidae, while the epiphytal community was dominated by families like Thalestridae and Laophontidae. These differences in composition may also imply a differential functional diversity.
Trophic biomarkers (stable isotopes, fatty acids) were used to identify the major sources of organic matter contributing to the copepods diet and hence to gain insight in the overall carbon flux. Harpacticoid copepods showed preferences to feed upon the epiphytal biofilm community composed of bacteria, diatoms, fungi and microalgae. Copepods used the seagrass and detritus material merely as substrate, but were attracted to the biofilm rather than the plant material which is rich in structural carbohydrates difficult to assimilate by animals (i.e. lignin, cellulose, ...).
Since harpacticoid copepods showed to use different sources of carbon, unravelling the contribution of each of them and the role of the degradation level of the detritus for food selectivity is the next step forward.
Centre Interfacultaire de Recherches en Océanologie - MARE
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Implications of Posidonia oceanica litter and its microbial and faunal associated communities in the carbon cycle of an coastal oligotrophic area (FRFC 2.4511.09) (2009-2013)
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/87777

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