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Molluscan fauna in the freshwater tidal area of the River Minhoestuary, NW of Iberian Peninsula

Published online by Cambridge University Press:  15 February 2009

R. Sousa ,
L. Guilhermino  and
C. Antunes
R. Sousa
Affiliation:
CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Rua dos Bragas, 4050-123 Porto, Portugal. ICBAS, Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Departamento de Estudos de Populações, Laboratório de Ecotoxicologia, Lg. Prof. Abel Salazar 2, 4099-003 Porto, Portugal.
L. Guilhermino
Affiliation:
CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Rua dos Bragas, 4050-123 Porto, Portugal. ICBAS, Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Departamento de Estudos de Populações, Laboratório de Ecotoxicologia, Lg. Prof. Abel Salazar 2, 4099-003 Porto, Portugal.
C. Antunes
Affiliation:
CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Rua dos Bragas, 4050-123 Porto, Portugal.
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Abstract

Ten species of molluscs were identified in the freshwater tidal area of the River Minho estuary. Species richness per site rangedfrom 1 to 9. Abundance ranged from 230 to 4130 individuals per m², with an average of 1412 individuals per m2. Corbiculafluminea(Müller, 1774) presented the highest density, corresponding to 88.7 % of the total specimens gathered, followed byPisidium amnicum (Müller, 1774) with 5.8 %. Biomass ranged from 17.0 to 249.6 g AFDW m-2, with an average of 99.8 gAFDW m-2. C. fluminea was the species dominating the total biomass (95.4 %), followed by Bithynia tentaculata (Linnaeus,1758) with 1.6 %. A multivariate analysis revealed a community with two distinct groups : one group almost or exclusivelyrepresented by C. fluminea, and another group with a more diverse assemblage.

Keywords

River Minho estuaryabundancebiomassmolluscsdiversityenvironmental factors
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 41 , Issue 2 , June 2005 , pp. 141 - 147
Copyright
© Université Paul Sabatier, 2005

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