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

A pioneering study has documented the first records of freshwater bivalves in the floodplain lagoons of Ilha Grande National Park, Paraná, Brazil. The research identified three species: native Pisidium and Diplodon, as well as the invasive Corbicula fluminea. Notably, Diplodon showed highest densities in São João/C lake, while Pisidium sterkianum was prevalent in São João/M lake. The invasive C. fluminea thrived in Jatobá/C lagoon, highlighting its ecological impact. The study underscores the role of abiotic factors—such as granulometric texture, organic matter, and macrophyte banks—in shaping bivalve distribution. These findings are significant for conservation efforts, as they reveal the park's lagoons as potential refuges for native species in the Upper Paraná River floodplain, an area with long gaps in records. The research contributes to understanding the ecology of these mollusks while emphasizing the importance of protecting these heterogeneous lacustrine environments.

Ragonha, F. H., Pinha, G. D., Petsch, D. K., Mansur, M. C. D., & Takeda, A. M. (2014). First records of Freshwater Bivalves of Ilha Grande National Park, Paraná, Brazil. Iheringia. Série Zoologia, 104(1), 14–20. https://doi.org/10.1590/1678-4766201410411420