%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Denis, J.
%A Rabhi, K.
%A Le Loc'h, François
%A Lasram, F. B.
%A Boutin, K.
%A Kazour, M.
%A Diop, M.
%A Gruselle, M. C.
%A Amara, R.
%T Role of estuarine habitats for the feeding ecology of the European eel (Anguilla anguilla L.)
%D 2022
%L fdi:010085957
%G ENG
%J PLoS One
%@ 1932-6203
%K FRANCE ; MANCHE ; SLACK ESTUAIRE ; WIMEREUX ESTUAIRE ; LIANE ESTUAIRE ; CANCHE ESTUAIRE ; AUTHIE ESTUAIRE ; SOMME ESTUAIRE
%M ISI:000835338100026
%N 7
%P [23 ]
%R 10.1371/journal.pone.0270348
%U https://www.documentation.ird.fr/hor/fdi:010085957
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2022-09/010085957.pdf
%V 17
%W Horizon (IRD)
%X This study aims to characterize and compare the feeding ecology of the European eels (Anguilla anguilla L.) during the continental phase (i.e. yellow and silver) along a salinity gradient (i.e. lower, middle and upper) in six northern France estuaries (i.e. brackish water). The diet and stable isotopic (i.e. delta N-15 and delta C-13 values) compositions of eels collected with a fyke net in six estuaries (Slack, Wimereux, Liane, Canche, Authie and Somme estuaries) located along the French coast of the eastern English Channel per season over a year were described by combining gut content and stable isotope analyses. Eel guts were dominated by typical BW prey, Malacostraca and Actinopterygii (54% and 40%, respectively), with the gammare Gammarus zaddachi and the green crab Carcinus maenas (38% and 14%, respectively), and smaller yellow eels of A. anguilla and juvenile European flounder, Platichthys flesus (19% and 14%, respectively) being the most frequently found in their guts. The delta C-13 values of a majority of eels confirmed the sea- and brackish water-specific carbon resources. Dietary and isotopic niche revealed no clear change between total length, silvering stages and seasons, but a significant difference between salinity gradients and estuaries. Eels delta C-13 values showed significant enrichment from upper to lower along the estuaries while the delta N-15 values showed an inverse effect, with the lowest values in the lower part and highest in the upper part. Higher variability in delta C-13 values in larger estuaries suggested that eels feed on a wide range of food sources than in smaller estuaries. While eels in the smaller estuaries fed mainly on Actinopterygii prey, eels in the larger ones had a lower trophic level (i.e. delta N-15 values) and fed mainly on Malacostraca prey. This spatial difference in dietary and isotopic niche is discussed in relation to biological structure of eel and environmental variables.
%$ 034 ; 032 ; 040