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2005•Annales de Limnologie - International Journal of LimnologyOpen access

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

Ronaldo Sousa, Lúcia Guilhermino, Carlos Antunes

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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 ranged from 1 to 9. Abundance ranged from 230 to 4130 individuals per m², with an average of 1412 individuals per m2. Corbicula fluminea(Müller, 1774) presented the highest density, corresponding to 88.7 % of the total specimens gathered, followed by Pisidium amnicum (Müller, 1774) with 5.8 %. Biomass ranged from 17.0 to 249.6 g AFDW m-2, with an average of 99.8 g AFDW 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 exclusively represented by C. fluminea, and another group with a more diverse assemblage.

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Ten species of molluscs were identified in the freshwater tidal area of the River Minho estuary. Species richness per site ranged from 1 to 9. Abundance ranged from 230 to 4130 individuals per m², with an average of 1412 individuals per m2. Corbicula fluminea(Müller, 1774) presented the highest density, corresponding to 88.7 % of the total specimens gathered, followed by Pisidium amnicum (Müller, 1774) with 5.8 %. Biomass ranged from 17.0 to 249.6 g AFDW m-2, with an average of 99.8 g AFDW 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 exclusively represented by C. fluminea, and another group with a more diverse assemblage.

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Available abstract

Ten species of molluscs were identified in the freshwater tidal area of the River Minho estuary. Species richness per site ranged from 1 to 9. Abundance ranged from 230 to 4130 individuals per m², with an average of 1412 individuals per m2. Corbicula fluminea(Müller, 1774) presented the highest density, corresponding to 88.7 % of the total specimens gathered, followed by Pisidium amnicum (Müller, 1774) with 5.8 %. Biomass ranged from 17.0 to 249.6 g AFDW m-2, with an average of 99.8 g AFDW 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 exclusively represented by C. fluminea, and another group with a more diverse assemblage.

Key concepts: Corbicula fluminea, Estuary, Biomass (ecology), Species richness, Abundance (ecology), Ecology, Fauna, Biology

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