Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X5423
Acta Limnologica Brasiliensia
Research Note

Distribution of invasive bivalves in Paraguay: filling the gaps in the heart of South America

Distribuição de bivalves invasores no Paraguai: preenchendo as lacunas no coração da América do Sul

Igor Christo Miyahira; Rebeca Carballo; Héctor Samuel Vera-Alcaraz; Cristhian Clavijo

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Abstract

La Plata Basin is the second largest hydrographic system in South America but the most impacted by invasive species of molluscs in the continent. Paraguay is a land-surrounded South American country with scarce information about malacological fauna. To fill some of these gaps, a large field expedition was conducted to analyze the distribution of invasive freshwater bivalves in Paraguay. The field survey encompassed 41 sampling stations in seven Departments of Paraguay. The mussels were searched using bare hands and feet. All stations were georeferenced and some environmental parameters were measured. Results indicated the presence of three invasive species of freshwater bivalves in Paraguay: Corbicula fluminea, C. largillierti, and Limnoperna fortunei. The Asiatic clam Corbicula fluminea was the most widespread invasive species, covering main rivers and small tributaries in the four freshwater ecoregions of Paraguay. The two remaining invasive species were more restricted. Corbicula largillierti were found at the lower section of the Paraná River, and Limnoperna fortunei inhabits the main river canals of the Paraguay River and the lower section of the Paraná River. The invasive species were found in three protected areas of Paraguay and can represent a threat to the mostly unknown fauna of native mussels. The invasive bivalves are widespread in Paraguay. Mitigation measurements must be taken to avoid the spread of these species and more drawbacks over native fauna.

Keywords

South America, La Plata Basin, Paraguay, Limnoperna, Corbicula

Resumo

A bacia do Plata é a segunda maior da América do Sul, mas a mais impactada pelas espécies invasoras de moluscos nesse continente. O Paraguai é uma país cercado por terra com pouca informação sobre a sua malacofauna. Com o objetivo de preencher algumas destas lacunas, uma expedição de campo foi organizada a fim de analisar a distribuição dos bivalves invasores no Paraguai. Foram realizadas 41 estações de coleta em sete departamentos do Paraguai. A busca pelos bivalves foi feita utilizando pés e mãos. Todos os pontos foram georreferenciados e algumas variáveis ambientais foram medidas. Os resultados indicam a presença de três espécies de bivalves invasores no Paraguai: Corbicula fluminea, C. largillierti e Limnoperna fortunei. O berbigão asiático Corbicula fluminea foi a espécie com a distribuição mais ampla, cobrindo os principais rios e tributários, em quatro ecoregiões de água doce do Paraguai. As outras duas espécies apresentaram uma distribuição mais restrita. Corbicula largillierti foi encontrado no Baixo rio Paraná, enquanto Limnoperna fortunei foi encontrado na calha principal do rio Paraguai e no Baixo rio Paraná. As espécies invasoras foram encontradas em três unidades de conservação e pode representar a ameaça para a pouco conhecida fauna de bivalves nativos do Paraguai. As espécies de bivalves invasores estão amplamente distribuídas no Paraguai. Medidas de mitigação são necessárias para evitar que estas espécies se dispersem ainda mais, provocando mais efeitos negativos sobre as espécies nativas.

Palavras-chave

América do Sul, Bacia do Río de La Plata, Paraguai, Limnoperna, Corbicula

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Submitted date:
06/13/2023

Accepted date:
11/24/2023

Publication date:
02/08/2024

65c4d38ea9539570ca7bbab3 alb Articles
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