Influence of trophic pathways on daily growth patterns of Western Mediterranean anchovy (Engraulis encrasicolus) larvae
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AuthorsQuintanilla-Hervás, J.M. (José María); Laiz-Carrión, R. (Raúl); Uriarte-Ramalho, A. (Amaya); García-García, A. (Alberto)
KeywordsEuropean anchovy larvae · Western Mediterranean · Daily growth increments · Otolith microstructure analysis · Stable isotope analysis · Trophic position · Feeding behavior
ABSTRACT: Late larval stages of anchovy Engraulis encrasicolus ranging from 10 to 20 mm standard length were sampled in the 2009 Mediterranean Acoustic Surveys project carried out during the spawning season off the Ebro River plume (NW Mediterranean [NWM] population) and the Bay of Málaga (SW Mediterranean [SWM] population). A combined study of environmental variables, daily growth, otolith biometry and stable isotope analysis (SIA) was undertaken to differentiate the trophic influence on larval growth rates. An inter-population comparative analysis determined trophic-based differences in their growth patterns. The NWM population showed a specialized prey selectivity associated with a low productive ecosystem in contrast to the SWM population, which showed a more generalist feeding behavior associated with an ecosystem of higher food resources. Moreover, 13C values were significantly different between populations, indicating the different origin of carbon sources. The intra-population ...
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