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Shell variability in Tawera gayi (Veneridae) from southern South America: a morphometric approach based on contour analysis

Published online by Cambridge University Press:  02 June 2010

Sandra Gordillo ,
Federico Márquez ,
Javiera Cárdenas  and
Miguel Ángel Zubimendi
Sandra Gordillo*
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra (CICTERRA, CONICET), Córdoba, Argentina. Centro de Investigaciones Paleobiológicas, Universidad Nacional de Córdoba (CIPAL, UNC), Avenida Vélez Sársfield 299, X5000JJC Córdoba, Argentina
Federico Márquez
Affiliation:
Biología y Manejo de Recursos Acuáticos (CENPAT, CONICET), Blvd Brown 2915, Puerto Madryn (U9120ACF), Chubut, Argentina, Universidad Nacional de la Patagonia San Juan Bosco, Blvd Brown 3100, Puerto Madryn (U9120ACF), Chubut, Argentina
Javiera Cárdenas
Affiliation:
Fundación Centro de Estudios del Cuaternario (CEQUA), Punta Arenas, Chile, Centro de Ciencias Ambientales EULA, Universidad de Concepción, Casilla 160-C, Barrio Universitario s/n, Concepción, Chile
Miguel Ángel Zubimendi
Affiliation:
Becario CONICET, Departamento de Arqueología, Museo de La Plata, FCNyM, UNLP and Universidad Nacional de la Patagonia Austral–Unidad Académica Caleta Olivia
*
Correspondence should be addressed to: S. Gordillo, Centro de Investigaciones en Ciencias de la Tierra (CICTERRA, CONICET), Córdoba, Argentina email: gordillosan@yahoo.es or sgordillo@efn.uncor.edu
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Abstract

This study analyses the significance of shell morphological variations in the venerid clam Tawera gayi, a typical element of shallow marine soft bottoms in southern South America and the most common species recovered from Late Quaternary marine deposits along the Beagle Channel, Tierra del Fuego. Fossil and modern Tawera shells from different localities around the southern tip of South America were analysed using the Elliptic Fourier Analysis (EFA) method. Taking into account the palaeontological history of this genus in the southern hemisphere, EFA was also performed on shells of Tawera congeners from South Africa (T. philomela) and New Zealand (T. spissa). The use of EFA permitted the distinction between the three Tawera species and geographical differentiation in the T. gayi groups. These morphological variations of T. gayi appear best related to ecophenotypic plasticity as a response to different environmental conditions, although the palaeobiogeographical history of Tawera in South America cannot be ruled out.

Keywords

Tawera gayiBivalviaMagellan Regionmorphometircsshell shape
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Issue 4 , June 2011 , pp. 815 - 822
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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