Reference : Trophic ecology of icefishes (Notothenioidei, Perciformes) in a context of climate change
Scientific congresses and symposiums : Poster
Life sciences : Zoology
Life sciences : Environmental sciences & ecology
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/216263
Trophic ecology of icefishes (Notothenioidei, Perciformes) in a context of climate change
English
Peignot, Quentin [Université de Liège - ULiège > Département de Biologie, Ecologie, Evolution > Océanographie biologique > >]
Frederich, Bruno mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Lepoint, Gilles mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Michel, Loïc mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
23-Nov-2017
A0
No
No
International
ZOOLOGY 2017 - 25th Benelux congress of Zoology
23 novembre au 24 novembre 2017
Royal Dutch Zoological Society
Royal Belgian Zoological Society
Wageningen
Pays Bas
[en] stable isotopes ; icefish ; Antarctica ; trophic ecology
[en] The Southern Ocean currently undergoes major environmental modifications related to climate change. When faced with environmental changes, all organisms are expected to have some intrinsic capacity to adapt their ecological habits to their new life conditions. Currently, biological traits of many Antarctic species are still unknown and we need such information to assess their capacity to adapt to natural and anthropogenic perturbations. Notothenioidei (Perciformes), or icefishes, are endemic to the Southern Ocean and they are an important trophic component of these marine ecosystems. Here we used stable isotopes ratios of carbon (δ13C) and nitrogen (δ15N) of two well represented genera of icefishes (Trematomus and Lepidonotothen) sampled in 2002/2004 and/or in 2015/2016 to better understand their resources partitioning and the influence of environmental changes on their trophic ecology. Isotopic niches (which are a proxy of the realized ecological niches) were modeled using the SIBER (Stable Isotope Bayesian Ellipses in R) R-package. Our results revealed a great variation in isotopic compositions among icefishes, suggesting that they exploit a wide array of resources. The overlap between the isotopic niches of Trematomus and Lepidonotothen genera in 2002/2004 highlights a possible past competition for resources. Moreover, temporal evolution of niches suggests taxon-specific ecological plasticity in response to variation in environmental parameters and/or in prey availability. An increase in resources partitioning between the two genera was observed over the studied period. In the future, it would be interesting to use mixing models including isotopic composition of potential preys to identify possible changes in their trophic ecology.
Freshwater and OCeanic science Unit of reSearch - FOCUS ; Centre Interfacultaire de Recherches en Océanologie - MARE
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Refugia and Ecosystem Tolerance in the Southern Ocean (RECTO)
Researchers
http://hdl.handle.net/2268/216263

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
Poster_Zoology_PEIGNOT.pdfAuthor postprint160.75 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.