First records of Freshwater Bivalves of Ilha Grande National Park, Paraná, Brazil

Abstract

ABSTRACT. The Ilha Grande National Park, Paraná, Brazil, is located in the Upper Paraná River and has characteristics typical of a floodplains. This protected area includes lagoons connected and disconnected to the Paraná River, although the latter also connect during periods of high water level, thus composing a heterogeneous group of lacustrine environments. The enormous potential the flora and fauna diversities are still little known to the region, as can be seen through benthic invertebrates, inclunding bivalves mollusks. The granulometric composition of these floodplain lagoons was formed mainly by mud and very fine sand. Furthermore, organic matter composition was predominantly of fine particulate. The other abiotic factors differed from lagoons located within the island of the park to those located in the left margin of Paraná River. The results demonstrated the importance of abiotic factors such as the physical composition of granulometric texture, organic matter and macrophyte banks, to the establishment of bivalves in these floodplain lagoons. We recorded bivalves of Pisidium (native), Diplodon (native), and Corbicula (invasive).The highest values of Diplodon sp. density were observed at São João/C lake, for Pisidium sterkianum (Pilsbry, 1897) at São João/M lake, and to Jatobá/C lagoon with high density of invasive species Corbicula fluminea (Müller, 1774). This study to obtain conduct the first records of freshwater bivalves in floodplains lagoon in the Ilha Grande National Park, and provides contributions to better understanding the ecology of these mollusks. The recording of native species in the region of Upper Paraná River floodplain after a lomg period without new records, demonstrated the importance of protecting the lagoons of the Ilha Grande National Park as they can be a possible refuge to some species of native freshwater bivalves. KEYWORDS. Floodplains, lagoons, native species, invaders.RESUMO. Bivalves límnicos do Parque Nacional de Ilha Grande, Paraná, Brasil. O Parque Nacional de Ilha Grande (Paraná, Brasil) é localizado no Alto Rio Paraná e apresenta características típicas de uma planície de inundação. Essa área de proteção ambiental inclui uma heterogeneidade de ambientes lacustres, dentre estes lagoas conectadas e não conectadas ao rio Paraná. Os enormes potenciais de diversidade tanto de flora quanto de fauna são ainda pouco conhecidos para o local, como para os invertebrados bentônicos, e dentre eles, os moluscos bivalves. A composição granulométrica das lagoas foi constituída basicamente de sedimentos mais finos, como lama e areia muito fina, e a matéria orgânica composta predominantemente por partículas finas. Também observamos diferenças espaciais nos fatores limnológicos, separando as lagoas situadas dentro da ilha do parque, das contidas na margem esquerda do rio Paraná. Esses dados demonstraram a importância dos fatores físicos como composição da textura granulométrica, matéria orgânica e bancos de macrófitas para o estabelecimento dos bivalves nesses ambientes. Registramos b...

I See Golden Mussel! They are Everywhere! Environmental DNA Supports Widespread Dissemination of Limnoperna fortunei in Hydrographic Basins in the Paraná State, Brazil.

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First record and range extension of Corbicula fluminea (Müller, 1774) (Bivalvia, Cyrenidae) in the Chapada dos Veadeiros region, Goiás, Brazil

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