Detalls de la publicació.


Autor(s):Cerna Francisco, Saavedra-Nievas Juan Carlos, Plaza-Pasten Guido, Niklitschek Edwin, Morales-Nin Beatriz
Títol:Ontogenetic and intraspecific variability in otolith shape of anchoveta (Engraulis ringens) used to identify demographic units in the Pacific Southeast off Chile.
JCR Impact Factor:1.488
Resum:The phenotypical variability in otolith shape of anchoveta (Engraulis ringens) was analysed in three zones(I, II and III) from north to south along the Chilean coast, using juvenile and adult fish. Generalised additive models wereused to analyse shape indices and canonical discriminant analysis was used to analyse elliptical Fourier harmonics. Theform factor and ellipticity indices varied significantly among the three zones, whereas roundness, circularity andrectangularity indices only showed differences between Zones I and III. Fourier reconstructed outlines for five ontogeneticstages suggested important differences among sampling zones, which were larger for sampling Zone III, where, at the samefish length, otoliths were smaller than those sampled in Zones I and II, at least at the pre-recruit stage. Elliptical Fourierdescriptors showed significant differences among the three units, with a total percentage of correct classifications forjuveniles of 89 and 74% for raw data and cross-validated cases respectively, compared with.85 and,65% respectively foradult fish. The results support the hypothesis that juveniles and adults of anchoveta have remained segregated throughouttheir entire, or at least a fraction of, their life cycle, mainly between the extreme northward and southward zones.

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