Influence of upwelling conditions on feeding habits and trophic position of planktophagous fish
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Fecha de publicación2015-09-11
Palabras clavetrophic relationships
The effect of upwelling conditions on the trophic level of four planktofagous fish (Gadiculus argenteus, Capros aper and juveniles of Micromesistius poutassou and Merluccius merluccius) on the continental shelf off Northwestern Spain was assessed by coupling stomach content analyses and isotopic data. The study was performed during two consecutive years characterized by contrasting oceanographic conditions during the summer season; the first year (2012) had an intense and extended upwelling period, while the second (2013) had an intermittent and weak upwelling season. Sampling was carried out in autumn, after the summer upwelling, along a transect parallel to the coast on the continental shelf (130-180m depth), following the main upwelling gradient towards the Northeast. In addition to stomach content sampling and isotopic analyses of fish muscle, the isotopic signature of benthic detritus and sub- superficial phytoplankton were also indentified to characterize the basal isotopic level. ...
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