Abstract
Abstract The Guandu River Basin is extremely important to state of Rio de Janeiro, as a water supplier of several municipalities. However, the malacological knowledge and environmental status is not well known to this basin. The aim of this paper is to present an inventory of freshwater mollusks, as well as an environmental assessment through a Rapid Assessment Protocol, of ten sampling sites at Guandu River basin in six municipalities (Piraí, Paracambi, Japeri, Seropédica, Queimados and Nova Iguaçu). Thirteen species of molusks were found, eight native (Pomacea maculata, Biomphalaria tenagophila, Gundlachia ticaga, Gundlachia radiata, Omalonyx matheroni, Diplodon ellipticus, Anodontites trapesialis and Eupera bahiensis) and five exotics (Melanoides tuberculata, Ferrissia fragilis, Physa acuta, Corbicula fluminea and Corbicula largillierti). The environmental analysis ranked most sites as “modified”. The expansion of exotic species with their associated negative effects, as well the gap in knowledge of native species calls attention to the need of future studies of biology and ecology of the species found.
Highlights
Few molluscan studies were conducted in Guandu River Basin
The exotic species C. fluminea was found in all sampling sites
Five exotic species were found: three freshwater snails (M. tuberculata, P. acuta and F. fragilis) and two freshwater bivalves (C. fluminea and C. largillierti); except by F. fragilis, a cryptic species that were recently reported to Brazil (Lacerda et al 2015), the other species can be considered as invasive
Summary
Few molluscan studies were conducted in Guandu River Basin. Tubbs-Filho & Vettorazzi (2012) recorded the occurrence of the exotic bivalve Corbicula fluminea (Müller, 1774) in the tributaries of Ribeirão das Lajes which is an affluent of Guandu River. Thiengo et al (2001) reported sixteen species of limnic gastropods in the municipalities of Itaguaí, Seropédica, Queimados, Japeri, Paracambi and Nova Iguaçu, but without the information of the water body surveyed. The concern with the conservation of natural resources is growing due to constant alteration of habitats, overuse of natural resources and introduction of exotic species, which causes loss or reduction of the diversity at all scales (Lydeard et al 2004, Amaral et al 2008, Santos et al 2012, Miyahira et al 2012).
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