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The predominant landscape in the studied region, composed by the Paranapanema and Pardo rivers, has been significantly affected by human interference in order to create extensive artificial irrigation ditches for agriculture. These environments are subject to drastic variations in water supply whereby draughts are created what bears a drastic populational fluctuation. The composition of schistosomiasis-associated planorbid fauna in Ourinhos and Ipaucu herein presented corroborate previous malacological surveys, which incriminates Biomphalaria. glabrata (Say, 1818) as the predominant species mainly at the Ourinhos micro-regions. At this site the snail distribution might be linked to the composition of deposited sediments in the hydrographic basin. Data from Ipaucu, a collection site that is only 30 km from Ourinhos, indicates absence of B. glabrata, and predominance of B. tenagophila (Orbigny, 1835). Despite closeness, the micro-regions show important differences in values of diversity index, indicating a heterogeneous distribution of Biomphalaria species.

Distribuição e diversidade de espécies do gênero Biomphalaria em microrregiões localizadas no Médio Paranapanema, São Paulo, SP, Brasil