Ontogenic and intraspecific variability in otolith shape of anchoveta (Engraulis ringens) used to identify demographic units in the Pacific Southeast off Chile

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dc.contributor.author Cerna, F.
dc.contributor.author Saavedra-Nievas, J.C.
dc.contributor.author Plaza-Pasten, G.
dc.contributor.author Niklitschek, E.
dc.contributor.author Morales-Nin, B.
dc.date.accessioned 2020-07-22T07:15:30Z
dc.identifier.uri http://hdl.handle.net/11201/153138
dc.description.abstract [eng] 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 were used to analyse shape indices and canonical discriminant analysis was used to analyse elliptical Fourier harmonics. The form factor and ellipticity indices varied significantly among the three zones, whereas roundness, circularity and rectangularity indices only showed differences between Zones I and III. Fourier reconstructed outlines for five ontogenetic stages suggested important differences among sampling zones, which were larger for sampling Zone III, where, at the same fish length, otoliths were smaller than those sampled in Zones I and II, at least at the pre-recruit stage. Elliptical Fourier descriptors showed significant differences among the three units, with a total percentage of correct classifications for juveniles of 89 and 74% for raw data and cross-validated cases respectively, compared with >85 and ~65% respectively for adult fish. The results support the hypothesis that juveniles and adults of anchoveta have remained segregated throughout their entire, or at least a fraction of, their life cycle, mainly between the extreme northward and southward zones.
dc.format application/pdf
dc.relation.isformatof Versió postprint del document publicat a: https://doi.org/10.1071/MF18278
dc.relation.ispartof Marine and Freshwater Research, 2019, vol. 70, p. 1794-1804
dc.subject.classification 57 - Biologia
dc.subject.classification Medi ambient
dc.subject.classification 502 - Natura. Estudi, conservació i protecció de la natura
dc.subject.other 57 - Biological sciences in general
dc.subject.other Environment
dc.subject.other 502 - The environment and its protection
dc.title Ontogenic and intraspecific variability in otolith shape of anchoveta (Engraulis ringens) used to identify demographic units in the Pacific Southeast off Chile
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/acceptedVersion
dc.date.updated 2020-07-22T07:15:30Z
dc.date.embargoEndDate info:eu-repo/date/embargoEnd/2026-12-31
dc.embargo 2026-12-31
dc.rights.accessRights info:eu-repo/semantics/embargoedAccess
dc.identifier.doi https://doi.org/10.1071/MF18278


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