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Phenotypic variation of south-western Atlantic clam Mactra isabelleana (Bivalvia: Mactridae)

Published online by Cambridge University Press:  22 May 2012

Javier H. Signorelli ,
Federico Márquez  and
Guido Pastorino
Javier H. Signorelli*
Affiliation:
Biología y Manejo de Recursos Acuáticos–CENPAT–CONICET, Bvd. Brown 2915, U9120ACD Puerto Madryn, Chubut, Argentina
Federico Márquez
Affiliation:
Biología y Manejo de Recursos Acuáticos–CENPAT–CONICET, Bvd. Brown 2915, U9120ACD Puerto Madryn, Chubut, Argentina Universidad Nacional de la Patagonia San Juan Bosco. Bvd. Brown 3100, U9120ACD Puerto Madryn, Chubut, Argentina
Guido Pastorino
Affiliation:
Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia', Avenida Ángel Gallardo 470 C1405DJR, Ciudad de Buenos Aires, Argentina
*
Correspondence should be addressed to: J.H. Signorelli, Biología y Manejo de Recursos Acuáticos–CENPAT–CONICET, Bvd. Brown 2915, U9120ACD Puerto Madryn, Chubut, Argentina email: jsignorelli@cenpat.edu.ar
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Abstract

The phenotypic shell shape variation of Mactra isabelleana was tested using the geometric morphometric method. Four localities were sampled along the Río de la Plata estuary and the coast of Buenos Aires province. Principal component analysis and canonical variates analysis of the first principal components were performed to reveal the shell variation and differences among localities, respectively. The specimens from different microhabitats mostly overlapped, although differences in shape were observed in the development of the umbo, the enlargement of the dorsoventral axes and the elongation of the posterior end. The ecological and physical parameters that could influence shell shape variation are discussed.

Keywords

Bivalviaestuaryshell variationMactridaed'Orbignygeometric morphometriclandmarks
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Special Issue 2: Fish and Fisheries , March 2013 , pp. 511 - 517
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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