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Gastropods from raised marine deposits along the Beagle Channel, southern Argentina: the ancestors of the living fauna

Published online by Cambridge University Press:  23 August 2011

Diego G. Zelaya
Affiliation:
Museo de La Plata, División Zoología Invertebrados, Paseo del Bosque s/n, 1900 Buenos Aires, Argentina
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
*
Correspondence should be addressed to: S. Gordillo, Centro de Investigaciones en Ciencias de la Tiera (CICTERRA, Conicet), Córdoba, Argentina, Centro de Investigaciones Paleobiológicas, Universidad Nacional de Córdoba (CIPAL, UNC), Avenida Sórsfield 299, × 5000 JJG, Córdoba, Argentina email: [email protected]
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Abstract

This contribution focuses on the diversity of gastropods that lived in the Beagle Channel during the Early and Middle Holocene (from ca. 7500 to 4000 years BP). This temporal framework has special interest because it allowed us to evaluate the colonization process of a relatively recent marine ecosystem, the Beagle Channel (originated 8000–7500 years ago), and the possibility that this channel has represented a ‘faunistic corridor’ between the Atlantic and Pacific waters of the Magellan Region. Fossil material from four sampling localities was studied; 31 species of gastropods were identified. Additional records of four species of gastropods from six other sites at the Beagle Channel are provided. The fauna described in this work represents the ancestors of the living fauna in the region. In addition, most of these species are also currently found both in the Atlantic and Pacific Magellanic waters, strongly suggesting that the Beagle Channel represented a favourable route for the dispersal of molluscs.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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