Abstract
Amphidromous organisms grow, feed and reproduce in rivers but the newly hatched larvae migrate to the marine environment where they develop. The juveniles then migrate to fresh water. The present study aims to record the occurrence of the gastropod Vitta zebra in the São Francisco River, northeastern Brazil, and to warn of the risks the species faces due to the possible effects of human impact on its life cycle. Studies on the presence of the species in this river are required in order to develop conservation strategies.
Highlights
Amphidromy is a type of diadromy that can occur in fish (Thuesen et al, 2011), decapod crustaceans (Bauer, 2013), and gastropod mollusks (Pyron and Covich, 2003; Cook et al, 2010)
Among the Mollusca, Gastropoda stand out as the most diversified group. This diversity is paralleled by variations in modes of life, with species occurring on land, in freshwater and in marine environments
The present work aims to record for the first time the occurrence of the gastropod V. zebra in the São Francisco River, northeastern Brazil, highlighting the importance of its amphidromy, which makes the species vulnerable
Summary
Amphidromy is a type of diadromy that can occur in fish (Thuesen et al, 2011), decapod crustaceans (Bauer, 2013), and gastropod mollusks (Pyron and Covich, 2003; Cook et al, 2010). The neritid Vitta zebra (Bruguière, 1792) measures up to 23 mm in shell length and is distributed from French Guiana to Southeastern Brazil (São Paulo State) (Barroso et al, 2012) where it is found in fresh or brackish waters, on intertidal rocks, mangrove roots, and muddy bottoms (Barroso et al, 2012; Eichhorst, 2016) Studies on this species to date have described its taxonomy (Baker, 1924; Russel, 1941; Matthews–Cascon et al, 1990; Mienes, 1991), anatomy (Calvo, 1987; Barroso et al, 2012), intracapsular development (Barroso and Matthews–Cascon 2009a), and ecology (Barroso and Matthews–Cascon, 2009b)
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