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Use of shell-shape to discriminate between Brachidontes rodriguezii and Brachidontes purpuratus species (Mytilidae) in the transition zone of their distributions (south-western Atlantic)

Published online by Cambridge University Press:  24 September 2012

Silvina Van der Molen ,
Federico Márquez ,
Yanina L Idaszkin  and
Mariana Adami
Silvina Van der Molen*
Affiliation:
Centro Nacional Patagónico CENPAT–CONICET, Boulevard Brown 2915 (U9120ACD), Puerto Madryn, Argentina
Federico Márquez
Affiliation:
Centro Nacional Patagónico CENPAT–CONICET, Boulevard Brown 2915 (U9120ACD), Puerto Madryn, Argentina Universidad Nacional de la Patagonia San Juan Bosco, Blvd Brown 3100, Puerto Madryn (U9120ACD), Chubut, Argentina Universidad Nacional de Córdoba, Avenida Vélez Sarsfield 299, Córdoba (X5000JJC), Córdoba, Argentina
Yanina L Idaszkin
Affiliation:
Centro Nacional Patagónico CENPAT–CONICET, Boulevard Brown 2915 (U9120ACD), Puerto Madryn, Argentina Universidad Nacional de la Patagonia San Juan Bosco, Blvd Brown 3100, Puerto Madryn (U9120ACD), Chubut, Argentina Universidad Nacional de Córdoba, Avenida Vélez Sarsfield 299, Córdoba (X5000JJC), Córdoba, Argentina
Mariana Adami
Affiliation:
Museo de La Plata, Paseo del Bosque s/.n, 1900 La Plata, Argentina
*
Correspondence should be addressed to: S. Van der Molen, Centro Nacional Patagónico CENPAT–CONICET, Boulevard Brown 2915 (U9120ACD), Puerto Madryn, Argentina email: [email protected]
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Abstract

Mussels are important components of rocky shore assemblages throughout the world. Several mytilid species are found as multilayered beds in the intertidal along the coasts of the south-western Atlantic. However, in contrast to the north communities in the Pacific and Atlantic, those of the south-western Atlantic are dominated by species of small size, locally named mejillines. These mid-intertidal beds attached to consolidated substrates are dominated by virtual monocultures of two small-sized species of Brachidontes: B. rodriguezii (d'Orbigny, 1842) and B. (Perumytilus) purpuratus Lamarck, 1819, respectively distributed in the warm and cold temperate sectors of the south-western Atlantic; both coexisting in the transition zone between 40° and 44°S latitude. Nevertheless, there has been some confusion about the separation of B. rodriguezii and B. purpuratus, as well as about the boundaries of their distribution ranges in the south-western Atlantic. Here, on the basis of a morphogeometric analysis of shell morphology, we describe a feasible way for the identification of both species.

Keywords

Brachidontesgeometric morphometricsmytilidsshell shape morphologytransition zone distribution
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 3 , May 2013 , pp. 803 - 808
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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