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Benthic biodiversity off the eastern mouth of the Strait of Magellan (Argentina, south-west Atlantic)

Published online by Cambridge University Press:  13 September 2012

Romina Centurión  and
Juan López Gappa
Romina Centurión
Affiliation:
Museo Argentino de Ciencias Naturales, Ángel Gallardo 470, Ciudad Autónoma de Buenos Aires C1405DJR, Argentina
Juan López Gappa*
Affiliation:
Museo Argentino de Ciencias Naturales, Ángel Gallardo 470, Ciudad Autónoma de Buenos Aires C1405DJR, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
*
Correspondence should be addressed to: J. López Gappa, Museo Argentino de Ciencias Naturales, Ángel Gallardo 470, Ciudad Autónoma de Buenos Aires C1405DJR, Argentina email: [email protected]
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Abstract

The analysis of changes in benthic community structure using multivariate techniques has been successfully applied to the detection and monitoring of impacts caused by oil related activities. A survey to assess the status of the benthos was performed prior to a scheduled exploratory drilling at Banco Sarmiento, a shoal located off the eastern mouth of the Strait of Magellan (south-west Atlantic). The aims of this study are to provide baseline data about the composition and structure of the subtidal macrobenthic assemblages, to analyse the relationships between biodiversity and environmental variables, and to compare its benthic assemblages with those of neighbouring areas. Multivariate analyses classified the stations in two major groups, one composed of relatively shallow stations with coarse sediments dominated by filter-feeders, and the other consisting of stations with a high proportion of sand and mud dominated by deposit-feeders. Poorly sorted sediments had higher species richness than well sorted sediments. Shallow stations showed the lowest taxonomic distinctness due to the occurrence of a high proportion of bryozoans encrusting hard substrata. A five-fold increase in biodiversity can occur at scales of tens of km, suggesting that generalizations on regional biodiversity patterns should be made with caution because of the different gears used during the collection of samples, and should be based on a thorough knowledge about the physical environment.

Keywords

benthic macrofaunasubtidalbiodiversitytaxonomic distinctnesssouth-west Atlantic
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 3 , May 2013 , pp. 611 - 617
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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