Abstract
Anchovy (Engraulis ringens) population units were analyzed in three zones off the coast of Chile: 1: Arica-Iquique, 2: Coquimbo and 3: Talcahuano-Valdivia from samples obtaineds during the 2012 spawning season. We used 50 left sagittae otoliths from each zone to perform a morphometric analysis, which included basic measurements, shape indexes and contour analysis (elliptical Fourier analysis). A MANOVA and Tukey multiple comparison analyses, applied on basic measures and shape indexes showed significant differences between zone 3 and zones 1 and 2. A classification by Canonical Discriminant analysis of elliptical Fourier harmonics, indicated significant differences among zones. It is concluded, therefore, that otolith shape analysis could be used to discriminate population units of Engraulis ringens. Better results were achieved using elliptic Fourier coefficients than using only shape indices.
Highlights
Los factores ambientales tales como salinidad, temperatura del agua, profundidad, tipo de sustrato, así como hábitos tróficos, influyen en el tamaño y forma de los otolitos
Abstract.- Anchovy (Engraulis ringens) population units were analyzed in three zones off the coast of Chile: 1: Arica-Iquique, 2: Coquimbo and 3: Talcahuano-Valdivia from samples obtained during the 2012 spawning season
El análisis de la forma de los otolitos de anchoveta de Chile, sugiere la existencia de diferencias fenotípicas entre los ejemplares capturados en las tres zonas estudiadas, que pueden ser consideradas como unidades demográficas independientes
Summary
Abstract.- Anchovy (Engraulis ringens) population units were analyzed in three zones off the coast of Chile: 1: Arica-Iquique, 2: Coquimbo and 3: Talcahuano-Valdivia from samples obtained during the 2012 spawning season. A classification by Canonical Discriminant analysis of elliptical Fourier harmonics, indicated significant differences among zones It is concluded, that otolith shape analysis could be used to discriminate population units of Engraulis ringens. Dado que los otolitos constituyen un registro de la historia de vida del pez, un análisis morfométrico puede revelar diferencias en la estructura poblacional de una especie (Campana & Casselman 1993, Begg & Brown 2000, Tuset et al 2003a). Las variaciones en la forma de los otolitos han sido utilizadas para determinar la presencia de diferentes poblaciones de una misma especie, lo cual es considerado una unidad demográfica (Neilson et al 1985, Bird et al 1986, Campana & Casselman 1993, Begg & Brown 2000, Turan 2004, Turan et al 2006). El objetivo de este trabajo fue determinar, mediante el análisis morfométrico de los otolitos sagittae, si las anchovetas capturadas en las tres zonas de pesca, corresponden a unidades stock independientes
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