Article (Scientific journals)
Selective top-down control of epiphytic biomass by amphipods from Posidonia oceanica meadows: implications for ecosystem functioning
Michel, Loïc; Dauby, Patrick; Dupont, Alessandra et al.
2015In Belgian Journal of Zoology, 145 (2), p. 83-93
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Keywords :
Epiphyte grazing; Posidonia oceanica; mesograzers; Amphipoda; nutrient cycling
Abstract :
[en] Mediterranean Posidonia oceanica meadows shelter an important biomass and biodiversity of amphipod crustaceans that graze on epiphytes. However, their actual significance for ecosystem functional processes is hard to estimate, due to the lack of adequate data. Here, a field microcosm-based inclusion experiment was used to test if three of the dominant taxa of the amphipod community (Apherusa chiereghinii, Dexamine spiniventris and Gammarus spp.) could exert top-down control on seagrass leaf epiphytes. Influence of amphipod activity on nutrient availability for the host species was also investigated. All grazer taxa significantly reduced biomasses of erect macroalgae and erect sessile animals present on leaves. None of them consumed encrusting epiflora or epifauna. This selective top-down control could have important implications for the structure of the epiphytic community of P. oceanica leaves, which is one of the most diverse and abundant of all seagrass species. Grazing activity of all taxa caused higher N content of seagrass leaves, likely through amphipod excretion and/or sloppy feeding. Since P. oceanica meadows often grow in oligotrophic zones where plant growth can be nutrient-limited, this N enrichment could enhance seagrass production. Overall, the ecological interaction between P. oceanica and amphipods could be seen as a facultative mutualistic relationship. Our results suggest that amphipod mesograzers are key-elements in some of the functional processes regulating these complex and yet endangered ecosystems, which are essential components of Mediterranean coastal zones.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Zoology
Aquatic sciences & oceanology
Environmental sciences & ecology
Author, co-author :
Michel, Loïc  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanologie
Dauby, Patrick ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Systématique et diversité animale
Dupont, Alessandra;  University College London - UCL > Department of Genetics, Evolution and Environment
Gobert, Sylvie  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanologie
Lepoint, Gilles  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanologie
Language :
English
Title :
Selective top-down control of epiphytic biomass by amphipods from Posidonia oceanica meadows: implications for ecosystem functioning
Publication date :
July 2015
Journal title :
Belgian Journal of Zoology
ISSN :
0777-6276
eISSN :
2295-0451
Publisher :
Royal Belgian Zoological Society, Bruxelles, Belgium
Volume :
145
Issue :
2
Pages :
83-93
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 25 June 2015

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