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Spatial patterns of benthic diversity in molluscs from West Antarctica

Published online by Cambridge University Press:  27 May 2009

Cristian Aldea ,
Celia Olabarria  and
Jesús S. Troncoso
Cristian Aldea*
Affiliation:
Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Campus Lagoas Marcosende, 36310, Universidad de Vigo, Spain Fundación Centro de Estudios del Cuaternario de Fuego-Patagonia y Antártica (CEQUA), Av. Bulnes 01890, Punta Arenas, Chile
Celia Olabarria
Affiliation:
Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Campus Lagoas Marcosende, 36310, Universidad de Vigo, Spain
Jesús S. Troncoso
Affiliation:
Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Campus Lagoas Marcosende, 36310, Universidad de Vigo, Spain
*
*[email protected]
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Abstract

Despite several works that have documented patterns of diversity in deep sea organisms, trends of diversity and the processes responsible for such trends still remain unclear. To date very few studies have documented the effects of variables such as latitude and longitude in deep-sea organisms in the Antarctic region. We explored the spatial patterns of diversity of benthic gastropods and bivalves in an extensive region about 2200 km long and 500 km wide from the South Shetland Islands to the Bellingshausen Sea in West Antarctica. A total of 134 species from 54 sites was recorded. Alpha diversity and beta diversity (measured as Whittaker’s and Bray-Curtis similarity indices) were highly variable among areas. None of the species richness estimators measured as Sobs, Chao2, Jacknife1 and Jacknife2, stabilized towards asymptotic values in any area. The number of rare species was large with almost half of species represented by 1 or 2 individuals (41%) and most species (62%) restricted to 1 or 2 sites. The partial Mantel test revealed that similarity between sites increased with the decrease of depth differences, but not with horizontal separation.

Keywords

alphabeta and gamma diversityBellingshausen Seabivalvesgastropodsrare speciesSouth Shetland Islands
Type
Biological Sciences
Information
Antarctic Science , Volume 21 , Issue 4 , August 2009 , pp. 341 - 353
Copyright
Copyright © Antarctic Science Ltd 2009

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