Prospecção de moluscos exóticos na Bacia do Baixo Rio Grande
DOI:
https://doi.org/10.5216/rbn.v22i2.78470Keywords:
Mollusks, Invasive species, Water environments, Zoobenthos, Environmental impactAbstract
The invasion of non-native species poses a significant threat to global biodiversity, rivaling anthropogenic activities. Noteworthy invasive mollusks in South America include Corbicula fluminea, Limnoperna fortunei and Melanoides tuberculata. These species inflict both environmental and economic harm. This study focused on exotic mollusks in the Lower Rio Grande Basin. Sampling conducted at seven points across five municipalities in Minas Gerais and São Paulo in December 2020. Involved in situ analysis of physical and chemical parameters, alongside sediment collection for mollusk identification. Results indicated the absence of mollusks at points 1, 3, 6, and 7. Point 2 harbored all three species: L. fortunei (250 individuals), M. tuberculata (52 individuals), and C. fluminea (5 individuals). Points 4 and 5 hosted C. fluminea and M. tuberculata. High turbidity, low pH, and low temperature were identified as limiting factors for mollusk distribution, whereas higher temperatures and lower turbidity favored exotic species. Agricultural activities and the introduction of organic matter likely contribute to their proliferation. Depth influenced the presence of exotic mollusks, with shallower points supporting establishment. Understanding these variables is crucial for managing invasive species in aquatic ecosystems.
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