Moluscos límnicos de uma área do Alto Araguaia (Brasil)

Abstract

São mostrados os resultados do levantamento dos moluscos de água doce de 5 municípios da área de influência de uma usina hidrelétrica em estudo, formada pelas redondezas da Cachoeira Couto Magalhães no Rio Araguaia. Foram examinados 624 moluscos procedentes de amostras coletadas em 20 coleções hídricas. O exame revelou a ocorrência de 8 gastrópodos pulmonados e um prosobrânquio, além de um bivalvo esferídeo. Devido ao envolvimento com a saúde pública, merece destaque o encontro de Biomphalaria straminea e Lymnaea columella, respectivamente hospedeiros intermediários de Schistosoma mansoni e Fasciola hepatica.

A malacological survey in the Manso Power Plant, State of Mato Grosso, Brazil: new records of freshwater snails, including transmitters of schistosomiasis and exotic species

“…In the State of Espirito Santo, Brevifurcate apharyngeate cercariae were found in naturally infected P. marmorata and identified by morphological and molecular methods as Trichobilharzia sp., the main etiological agents of cercarial dermatitis in humans 45 . This observation suggests an increased possibility of the existence of unknown cases of avian cercarial dermatitis in Brazil, including the Central-West Region, due to the presence of well-established populations of P. marmorata in areas affected by hydroelectric plants in the Tocantins 9,46 and Araguaia 47 Rivers, in addition to those found in this study. Given the increasing number of dams in the middle-west region of the country over the past few years, malacological surveys should be performed in such areas.…”

Assessing the role of taxonomic impediment in the knowledge on geographic distribution of Physidae (Gastropoda: Hygrophila) in South America, using an intensive-data approach

“…Studies on physid species in the Neotropics and particularly in Brazil, are mostly concerned to the invasive P. acuta, and the native S. marmorata (Coimbra-Junior & Santos 1986, Paraense 1986, Teles et al 1991, Vaz et al 1992, Souza et al 1998, Thiengo et al 1998, 2001, 2002a, 2002b, 2005, Carvalho et al 2001, Fernandez et al 2010, Maldonado et al 2001, Medeiros et al 2002, Queiroz et al 2002, Callisto et al 2005 Consequently, the operational criteria used to delimit these species remain largely based on shell morphology, impairing the estimation of species diversity and distribution, as the shells of South American physids, with few exceptions, are very similar (Fig. 4).…”