Feeding success and selectivity of larval anchoveta Engraulis ringens in a fjord-type inlet from northern Patagonia (Southeast Pacific) [Éxito alimentario y selectividad en larvas de anchoveta Engraulis ringens en un canal tipo fiordo de patagonia norte (Pacífico Suroriental)]

Landaeta, M. F.; Ochoa-Munoz M.J.; Bustos C.A.

Keywords: Diet; Microplankton; Southern Chile; Stratification; Tides

Abstract

The diet and selectivity of larval anchoveta Engraulis ringens was studied during 4 consecutive days (austral spring) in Hornopirén inlet, a fjord-like environment of southern Chile. This environment was characterised by sharp halocline around 10 m depth, separating brackish and saltier waters. The potential prey field, microzooplankton, was collected at 4 depths (0, 5, 10 and 30 m), while the ichthyoplankton was collected at 2 strata, surface (0-10 m depth) and deep (10-45 m depth). Nauplii and copepodites were the major components of microzooplankton. The analysis of 487 gut contents of larval anchoveta indicates that similar volume of prey was ingested in both layers and during both tides. However, in the upper, brackish and warmer water, larval E. ringens ingested significantly less prey but of larger size, selecting nauplii and copepodites as the main prey items. In the deep, saltier and colder water, larvae ingested more prey of smaller size, showing only selectivity for nauplii. The feeding incidence of E. ringens increased twice during the flood, when the abundance of copepodites in the field also increased. Therefore, complex biophysical interactions occur in Patagonian fjords during the feeding process of larval stages of this commercially important species in tight relationship with the spatio-temporal distribution of prey.

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Título según SCOPUS: Feeding success and selectivity of larval anchoveta Engraulis ringens in a fjord-type inlet from northern Patagonia (Southeast Pacific) [Éxito alimentario y selectividad en larvas de anchoveta Engraulis ringens en un canal tipo fiordo de patagonia norte (Pacífico Suroriental)]
Título de la Revista: REVISTA DE BIOLOGIA MARINA Y OCEANOGRAFIA
Volumen: 49
Número: 3
Editorial: UNIV VALPARAISO
Fecha de publicación: 2014
Página de inicio: 461
Página final: 475
Idioma: English; Spanish
Notas: SCOPUS