Scientia Marina, Vol 76, No 4 (2012)

On the intraspecific variation in morphometry and shape of sagittal otoliths of common sardine, Strangomera bentincki, off central-southern Chile


https://doi.org/10.3989/scimar.03560.09A

Sandra Curin-Osorio
Facultad de Ciencias, Universidad Católica de la Santísima Concepción - COPAS Sur-Austral, Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanografía, Universidad de Concepción , Chile

Luis A. Cubillos
COPAS Sur-Austral, Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanografía, Universidad de Concepción , Chile

Javier Chong
Facultad de Ciencias, Universidad Católica de la Santísima Concepción , Chile

Abstract


Size and shape of fish otoliths are species-specific, but some species also display intraspecific variations. The common sardine, Strangomera bentincki, is a small pelagic fish inhabiting a seasonal upwelling ecosystem off central-southern Chile, having two discrete spawning sites along its latitudinal distribution. Otoliths of specimens were collected from commercial catches in Talcahuano and Corral, representing the central and south spawning zones. On the basis of otolith images, size-based shape descriptors were used to detect ontogenetic variation, and morphometric variables (length, breadth, area, perimeter and weight) were used to detect geographical differences in size and shape of otoliths. Outline analysis was studied on the basis of elliptic Fourier descriptors through multivariate statistical procedures. Size-based shape descriptors showed that otolith shape starts to be stable for fish larger than 12 cm total length, which keep an elliptical form. Morphometric variables for fish larger than 12 cm revealed intraspecific variation between central and south zones, which were associated with otolith weight and breadth. Outline analysis did not reveal significant spatial differences, but extreme intraspecific variation was due to the antirostrum, excisure, and posterior part of otoliths. Intraspecific variation in otolith size could be linked to differences in each spawning habitat and related to geographical origin, whose differences are not clearly identified. It is concluded that intraspecific variability in morphometric variables of sardine otoliths revealed geographic differences in size that are not attributable to allometric effects, and that otolith shape was similar between specimens from different geographic origin.

Keywords


otolith; outline; shape descriptors; intraspecific; Fourier; sardine; pelagic

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References


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