The Effect of Exposure to Suspended Sediment in Mortality of Corbicula Fluminea (Müller, 1774) (Bivalvia: Corbiculidae)
American Journal of Life Sciences
Volume 2, Issue 3, June 2014, Pages: 150-154
Received: May 14, 2014; Accepted: Jun. 3, 2014; Published: Jun. 10, 2014
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Authors
Neves Fernando F., Department of Biology, Faculty of Philosophy, Sciences and Languages of Ribeirão Preto, University of São Paulo, Brazil
Lavrador Marco A. S., Department of Physics and Chemistry of the Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Brazil
Costa Álvaro S., Department of Biology, Faculty of Philosophy, Sciences and Languages of Ribeirão Preto, University of São Paulo, Brazil
Avelar Wagner E. P., Department of Biology, Faculty of Philosophy, Sciences and Languages of Ribeirão Preto, University of São Paulo, Brazil
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Abstract
The erosion of rural watersheds, especially in the rainy season, deposit sediments in the waterways, and subsequently brings about one of the most important physicochemical changes in our water resources: the rise in their turbidity parameters. For freshwater bivalves, changes in water turbidity have a significant impact because they are filter feeders and depend on stable water conditions to regulate their physiological functions. Our preliminary studies have already demonstrated Corbicula fluminea`s (Müller 1774) intolerance to increases the turbidity of the water. In the current paper, we conducted research in the watersheds of the Pardo and Mogi rivers (State of São Paulo - Brazil). Under laboratory conditions, we did not observe statistical differences in the mortality rate of C. fluminea to turbidity levels of 150, 200 and 250 nephelometric turbidity units (NTU). Mortality rates of approximately 50% were observed when the specimens were exposed to these conditions for 96 to 120 hours. Results indicate that the species is sensitive or even intolerant to changes in turbidity, caused by suspended sediment, which explains the high mortality and the seasonal decline in the population of this species during rainy periods. The methodology used in this research, supported by the results produced, may indicate a new way of studying the decline of molluscan biodiversity that has been observed throughout Brazil.
Keywords
Pollution, Turbidity, Biodiversity, Riparian Vegetation, Mollusca
To cite this article
Neves Fernando F., Lavrador Marco A. S., Costa Álvaro S., Avelar Wagner E. P., The Effect of Exposure to Suspended Sediment in Mortality of Corbicula Fluminea (Müller, 1774) (Bivalvia: Corbiculidae), American Journal of Life Sciences. Vol. 2, No. 3, 2014, pp. 150-154. doi: 10.11648/j.ajls.20140203.14
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