Abstract
In the southwestern Atlantic Ocean, Isognomon bicolor is an invasive bivalve on rocky shores along the coast of Brazil. We report here records of this species rafting on floating debris in Uruguay (ca. 34° S). Rafting may be an important mechanism for the dispersal of I. bicolor on the coast of Uruguay and elsewhere in the Southernmost Atlantic Ocean and the presence of this invasive species on rocky shores should be monitored.
Highlights
Passive dispersal of organisms rafting on artificial items floating over the sea surface may account for the transport of animals to areas otherwise unavailable by other natural dispersal mechanisms (Thiel and Gutow 2005)
I. bicolor occurs in many places on intertidal and subtidal rocky shores along the entire Brazilian coast
We found I. bicolor on floating debris (Figure 1) that had drifted ashore at two Breves et al | First record of Isognomon bicolor rafting to Uruguay sandy beaches between La Coronilla (Rocha) and Santa Teresa, Uruguay (Figure 2)
Summary
Passive dispersal of organisms rafting on artificial items floating over the sea surface may account for the transport of animals to areas otherwise unavailable by other natural dispersal mechanisms (Thiel and Gutow 2005). Isognomon bicolor was first recorded in Brazil by Domaneschi and Martins (2002) and according to these authors the southward expansion of this species occurred during the early 1980s. I. bicolor was probably introduced accidentally to the Brazilian coast on platforms or in ballast water (Oliveira and Creed 2008; Breves-Ramos et al 2010a).
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