Reference : Diversity, dynamics and trophic ecology of animal communities associated to Posidonia...
Scientific congresses and symposiums : Poster
Life sciences : Zoology
Life sciences : Environmental sciences & ecology
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/203235
Diversity, dynamics and trophic ecology of animal communities associated to Posidonia oceanica (L.) Delile macrophytodetrital accumulation: synthesis of a ten year study
English
Lepoint, Gilles mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Borges, Alberto mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO) >]
Champenois, Willy mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Unité d'Océanographie chimique (UOC) >]
Darchambeau, François mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO) >]
Dauby, Patrick mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Systématique et diversité animale >]
Gobert, Sylvie mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Mascart, Thibaud mailto [Universiteit Gent - Ugent > > Marine Biolgoy > >]
Michel, Loïc mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Remy, François mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Océanologie >]
Sturaro, Nicolas mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
De Troch, Marleen mailto [Universiteit Gent - Ugent > > Marine Biology > >]
17-Oct-2016
70 x 100
Yes
No
International
International Seagrass Biology Workshop (ISBW 12)
16 octobre 2016 au 22 octobre 2016
World Seagrass Association (WSA)
Nant Gwrtheyrn
UK (Wales)
[en] macrophytodetritus ; stareso ; Posidonia oceanica ; stable isotopes ; seagrass litter ; macrofauna ; meiofauna ; amphipods ; blue carbon
[en] In the Mediterranean, Neptune grass Posidonia oceanica, produces a huge quantity of detrital biomass. These macrophytodetritus may accumulate in shallow waters, forming litter accumulations colonised by abundant, yet understudied, animal communities. These accumulations are especially foraged by juvenile and adult fishes. Here, we aim to synthesize results obtained over the last ten years regarding diversity, dynamics and trophic ecology of associated meio- and macrofauna. Accumulations are found throughout the year but important seasonal and short-term variability in composition, quantity and physico-chemical parameters inside the accumulation is observed. Accumulations are dominated by respiration (litter degradation), however, primary production occurs at exposed surfaces (epiphytic production). Meio- and macrofauna have distinct traits in comparison to adjacent habitats (seagrass meadows or epilithic algae communities). A physico-chemical gradient occurs inside accumulations which partially defines assemblage composition and distribution. Meiofauna, in particular harpacticoid copepods, is diverse, abundant and composed of species from seagrass meadows, water column and sediment. In contrast, macrofaunal assemblages are simplified compared to the ones occurring in the seagrass meadows and are dominated by amphipods. Litter accumulations display a lower macrofaunal diversity than do seagrass meadows, but a higher abundance and animal biomass. Meio- and macrofauna show a high trophic diversity, dominated by ingestion and assimilation of epiphytes (macroalgae and, probably, detrivorous microbiota). Moreover, direct or indirect assimilation of carbon originating from seagrass detritus is demonstrated for many species. Although diverse trophic niches were observed, the assemblage showed a simplified trophic web structure compared to the seagrass meadows. Detritivorous organisms dominate this assemblage and are more abundant in the litter than in the living meadows. Consequently, according to its abundance and the fact it consumes directly and indirectly seagrass material, fauna associated to litter accumulation may play a significant role in the degradation and transfer to higher trophic level of detrital seagrass carbon.
Centre Interfacultaire de Recherches en Océanologie - MARE ; Freshwater and OCeanic science Unit of reSearch - FOCUS
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Implications des accumulations de litière de posidonies et des communautés microbiennes et détritivores associées dans le cycle du carbone d'un milieu marin côtier oligotrophe.
Researchers ; Students
http://hdl.handle.net/2268/203235
Synthetic result from Seagrass litter project started in 2005, granted by FNRS in 2009 and still in progress. Some publications related to the litter project may be found here: http://orbi.ulg.ac.be/simple-search?query=posidonia+macrophytodetritus. See also Borges & Champenois Limnology and Océanography 57(1), 347-361 (2012). Publications of MAscart and Remy'thesis results are still in progress.

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