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How the fluctuations of water levels affect populations of invasive bivalve Corbicula fluminea (Müller, 1774) in a Neotropical reservoir?
Paschoal, L R P; Andrade, D P; Darrigran, G.
Afiliação
  • Paschoal LR; Departamento de Ciências Biológicas, Fundação de Ensino Superior de Passos, Universidade do Estado de Minas Gerais, Passos, MG, Brazil.
  • Andrade DP; Departamento de Ciências Biológicas, Fundação de Ensino Superior de Passos, Universidade do Estado de Minas Gerais, Passos, MG, Brazil.
  • Darrigran G; Grupo de Investigación de Moluscos Invasores/Plagas, División Zoología Invertebrados, Museo de La Plata, Buenos Aires, Argentina.
Braz J Biol ; 75(1): 135-43, 2015.
Article em En | MEDLINE | ID: mdl-25945630
Corbicula fluminea is an invasive bivalve responsible for several environmental and financial problems around the globe. Despite the invasive potential of this species, it suffers certain restrictions in lentic environments due to natural phenomena that significantly affect its population structure (e.g. water column fluctuation and sunlight exposure). The present study addresses how temporal decline of the water level in a Neotropical reservoir and exposure to sunlight affect the population structure of C. fluminea. Samplings were carried out twice in the reservoir of Furnas Hydroelectric Power Station (HPS) (Minas Gerais, Brazil), in 2011 and 2012. Population density, spatial distribution and mean shell length of C. fluminea were estimated for each year after sampling in 51 quadrats (0.0625m2) placed on three transects at different distances along the reservoir margins (0, 10 and 20 m from a fixed-point). We observed a predominance of C. fluminea in both years, with a simultaneous gradual decrease in density and richness of native species in the sampling area. Significant differences in density of C. fluminea were registered at different distances from the margin, and are related to the temporal variability of physical conditions of the sediment and water in these environments. We also registered a trend toward an increase in the density and aggregation of C. fluminea as we moved away from the margin, due to the greater stability of these areas (>10 m). The mean shell length of C. fluminea showed significant difference between the distinct distances from the margin and during the years, as well as the interaction of these factors (Distances vs.Years). These results were associated with the reproductive and invasive capacity of this species. This study reveals that these temporal events (especially water column fluctuation) may cause alterations in density, spatial distribution and mean shell length of C. fluminea and the composition of the native malacofauna in Neotropical lentic environments.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Movimentos da Água / Corbicula / Água Doce Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Braz J Biol Assunto da revista: BIOLOGIA Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Movimentos da Água / Corbicula / Água Doce Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Braz J Biol Assunto da revista: BIOLOGIA Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil