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The introduction of Physa acuta (Gastropoda: Physidae) on Ilha Grande, Southeast Brazil, from initial stages to an established population

2021; Instituto Internacional de Ecologia (Brazil); Volume: 83; Linguagem: Inglês

10.1590/1519-6984.243801

1678-4375

Igor Christo Miyahira, Isabela Cristina Brito Gonçalves, Luiz Eduardo Macedo de Lacerda, Renata F. Ximenes, Sônia Barbosa dos Santos,

Environmental Toxicology and Ecotoxicology

Abstract This study presents a four-year follow-up of an introduced population of Physa acuta Draparnaud, 1805, from initial stages to an established population. This introduction occurred on a small impacted stream of Vila do Abraão, the main village of Ilha Grande (Angra dos Reis, Rio de Janeiro, Brazil). The population size increased during the study, and presented a relationship to environmental factors, especially with rainfall. On the initial stages of introduction prevailed the smaller specimens, but on the overall, predominated the intermediate size classes. After less than a year, P. acuta becomes established on this stream and was possibly affecting the other species found on the stream. The information presented here is useful to understand the invasion process of invasive snails, as well as directing conservation efforts.