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Colonizing new habitats and meeting new neighbors: Trophic relationships between the expanding round sardinella and coexisting small pelagic fish in the NW Mediterranean Sea

AuthorsAlbo Puigserver, Marta ; Borme, Diego; Coll, Marta ; Tirelli, Valentina; Palomera, Isabel ; Navarro, Joan
Issue Date6-Mar-2017
PublisherInternational Council for the Exploration of the Sea
CitationInternational symposium : Drivers of dynamics of small pelagic fish resources (2017)
AbstractClimate change is a main driver of the species expansions outside their native range. The arrival of new species may have important effects on ecosystems, affecting native species and communities. The recent northward expansion of the round sardinella Sardinella aurita in the Mediterranean Sea, has been documented as a consequence of water temperature increase. This expansion provides an excellent field-laboratory opportunity to investigate (1) the trophic strategies of marine species in expansion and (2) the trophic impact of this new species on ecological similar native species. Here we combined isotopic and stomach content analyses to investigate the trophic habits of round sardinella and the trophic relationships with coexisting pelagic fish species, in the NW Mediterranean Sea. Results revealed changes in the diet of round sardinella during the year. In summer, the most important preys were copepods (Acartia spp.) and cladocerans (Penilia avirostris). During autumn and winter, the diet was composed mainly by copepods and cirripeds. Surprisingly, during spring round sardinella mainly feed on salps (Thaliacea). This is the first study identifying salps as important prey in sardinella diet. When comparing trophic habits with coexisting pelagic fish, we found that round sardinella adults have a different trophic niche from European anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus). In contrast, round sardinella juveniles partially overlap with these species. These results provide new insights to understand the ecological role of the expanding round sardinella in the Mediterranean Sea
DescriptionInternational Council for the Exploration of the Sea (ICES) - North Pacific Marine Science Organization (PICES) International symposium : Drivers of dynamics of small pelagic fish resources, 6-11 March 2017, Victoria, BC, Canada
Publisher version (URL)https://meetings.pices.int/meetings/international/2017/pelagic/scope
Appears in Collections:(ICM) Comunicaciones congresos
(EBD) Comunicaciones congresos
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