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Analysis of the ontogenetic variation in body and beak shape of the Illex argentinus inner shelf spawning groups by geometric morphometrics

Published online by Cambridge University Press:  09 July 2009

Augusto César Crespi-Abril ,
Enrique Mario Morsan  and
Pedro José Barón
Augusto César Crespi-Abril*
Affiliation:
Centro Nacional Patagónico (CENPAT-CONICET), Boulevard Brown s/n, Puerto Madryn, (Chubut, Argentina)
Enrique Mario Morsan
Affiliation:
Instituto de Biología Marina and Pesquera ‘Almirante Storni’. Universidad Nacional del Comahue. San Antonio Oeste (Rio Negro, Argentina)
Pedro José Barón
Affiliation:
Centro Nacional Patagónico (CENPAT-CONICET), Boulevard Brown s/n, Puerto Madryn, (Chubut, Argentina)
*
Correspondence should be addressed to: A.C. Crespi-Abril, Centro Nacional Patagónico (CENPAT-CONICET), Boulevard Brown s/n, Puerto Madryn, (Chubut, Argentina) email: crespi@cenpat.edu.ar
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Abstract

In this paper we analysed size and shape differences of body (mantle and fins) and inferior beak of the squid Illex argentinus from two Patagonian inner-shelf spawning groups. A new method was developed to reconstruct three-dimensional coordinates based on the 2-D projection of the beak on a plane. Shape of the beak did not vary between groups, sexes and maturity condition of individuals. Also, no beak shape changes were observed through the ontogeny. In contrast, as larger and heavier squids were considered in shape analysis, body widened near the fin insertion, and fin area increased. Our results suggest that shape adaptations of I. argentinus through the ontogeny reflect modifications to optimize swimming performance rather than to increase gamete holding capacity.

Keywords

Illex argentinusgeometric morphometricscoastal spawning groupsArgentinean short-fin squid
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 90 , Issue 3 , May 2010 , pp. 547 - 553
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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