Ingested microplastics (>100μm) are translocated to organs of the tropical fiddler crab Uca rapax

Brennecke, Dennis; Ferreira, Erica C.; Costa, Tarso M.M.; Appel, Daniel; da Gama, Bernardo A.P.; Lenz, Mark

Ingested microplastics (>100μm) are translocated to organs of the tropical fiddler crab Uca rapax

2015

Microplastics, which are accumulating in marine sediments, are assumed to pose a risk for deposit feeding invertebrates. We tested whether the fiddler crab Uca rapax ingests and retains microplastics in its body. Furthermore, we investigated whether retention rates depend on (a) the quality of the marine environment in which the plastics were pre-weathered and on (b) their abundance. For this, polystyrene pellets were submersed at a polluted and a pristine site near Niterói, Brazil, for 2weeks. Then specimens of U. rapax were, in laboratory experiments, exposed to fragments (180–250μm) derived from these pellets for 2months. After this period, microplastics were observed in the gills, stomach and hepatopancreas of the animals. However, fragment retention was not influenced by the two factors that we manipulated. The presence of microplastics in different organs of the crab supports the assumption that these particles have the potential to harm marine invertebrates.

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