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Title: A trophic latitudinal gradient revealed in anchovy and sardine from the Western Mediterranean Sea using a multi-proxy approach
Authors: Bachiller, Eneko; Albo-Puigserver, Marta; Gimenez, Joan; Grazia Pennino, Maria; Mari-Mena, Neus; Esteban, Antonio and Lloret-Lloret, Elena; Jadaud, Angelique; Carro, Belen; Maria Bellido, Jose; Coll, Marta
Abstract: This work combines state-of-the-art methods (DNA metabarcoding) with classic approaches (visual stomach content characterization and stable isotope analyses of nitrogen (delta N-15) and carbon (delta C-13)) to investigate the trophic ecology of anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) at high taxonomic and spatial resolution in the Western Mediterranean Sea. Gut contents observed are in accordance with the dietary plasticity generally described for anchovy and sardine, suggesting a diet related to the opportunistic ingestion of available prey in a certain area and/or time. Genetic tools also showed modest inter-specific differences regarding ingested species. However, inter-specific and intra-specific differences in ingested prey frequencies and prey biomass reflected a latitudinal signal that could indicate a more effective predation on large prey like krill by anchovy versus sardine, as well as a generalized higher large prey ingestion by both species southwards. In fact, both species presented lower delta N-15 in the northernmost area. This latitudinal gradient indicates changes in the trophic ecology of anchovy and sardine that coincide with previously described better biological conditions for fish in the southern part of the study area as well as higher landings of both species in recent years.
Issue Date: 2020
Type: Article
DOI: 10.1038/s41598-020-74602-y
ISSN: 2045-2322
Funder: project PELWEB [ES-PN-2017-CTM 2017-88939-R]
project PELCAT [CAT 152CAT00013, TAIS ARP059/19/00005]
EU through the European Maritime and Fisheries Fund (EMFF)
Appears in Publication types:Artículos científicos

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