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

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....

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Bibliographic Details
Published in:Journal of the Marine Biological Association of the United Kingdom 2010-05, Vol.90 (3), p.547-553
Main Authors: Crespi-Abril, Augusto César, Morsan, Enrique Mario, Barón, Pedro José
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Argentinean short-fin squid
Autoecology
Biological and medical sciences
coastal spawning groups
Digital cameras
Discriminant analysis
Fundamental and applied biological sciences. Psychology
geometric morphometrics
Hominids
Illex argentinus
Invertebrates
Mammalia
Marine
Mollusca
Spawning
Swimming
Vertebrata
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Summary: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.
ISSN:0025-3154
1469-7769
DOI:10.1017/S0025315409990567