Article (Scientific journals)
Linking small pelagic dietary shifts with ecosystem changes in the Gulf of Lions
Brosset, Pablo; Le Bourg, Baptiste; Costalago, David et al.
2016In Marine Ecology. Progress Series, 554, p. 157-171
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Keywords :
Trophic ecology; Anchovy; Sardine; Sprat; Dietary overlap; NW Mediterranean
Abstract :
[en] Since 2008, a severe decrease in size and body condition together with a demographic truncation has been observed in the sardine (secondarily in anchovy) population of the Gulf of Lions (NW Mediterranean Sea). In parallel, sprat biomass, which was negligible before, has increased tenfold. All of these changes have strongly affected the regional fisheries. Using trophic and isotopic data from contrasting periods of low versus high growth and condition, we investigated potential changes in diet and interspecific feeding interactions through time. Evidence of resource partitioning was found between sprat and both anchovy and sardine in 2004 and 2005. Since 2010, the isotopic niches of the 3 species have tended to overlap, suggesting higher risk of competition for food resources. Moreover, the wider trophic niche of sprat indicates higher variability in individual diets. Anchovy and sardine diet varied through time, with a high proportion of large copepods or cladocerans in periods of high growth and condition (1994 and 2007, respectively) versus a dominance of small copepods in the present (2011−2012). Further-more, an important reduction in prey diversity was also identified in the diet of both anchovy and sardine during the most recent period. Our results support the hypothesis that changes in small pelagic fish growth, size and body condition and ultimately biomass could be due to bottom-up control characterized by changes in food availability and increasing potential trophic competition.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Brosset, Pablo;  Université Montpellier 2 > UMR MARBEC
Le Bourg, Baptiste ;  Université de Liège - ULiège > Doct. sc. (océano. - paysage)
Costalago, David;  Stockholm University > Department of Ecology, Environment and Plant Science
Banaru, Daniela;  Aix-Marseille Université > Mediterranean Institute of Oceanography
Van Beveren, Elisabeth;  Université Montpellier 2 > UMR MARBEC
Bourdeix, Jean-Hervé;  Université Montpellier 2 > UMR MARBEC
Fromentin, Jean-Marc;  Université Montpellier 2 > UMR MARBEC
Ménard, Frédéric;  Aix-Marseille Université > Mediterranean Institute of Oceanography
Saraux, Claire;  Université Montpellier 2 > UMR MARBEC
Language :
English
Title :
Linking small pelagic dietary shifts with ecosystem changes in the Gulf of Lions
Publication date :
2016
Journal title :
Marine Ecology. Progress Series
ISSN :
0171-8630
eISSN :
1616-1599
Publisher :
Inter-Research Science Publishing, Oldendorf Luhe, Germany
Volume :
554
Pages :
157-171
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 05 September 2016

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