Abstract
The paper describes the first occurrence of Pleopis schmackeri (Poppe, 1889) (Branchiopoda, Onychopoda) in Rio das Ostras, Rio de Janeiro, Brazil is described. This marine cladoceran species occurred in zooplanktonic samples obtained on July, 2003 with mean density of 10 ind.m-3. Its presence may be related to two hypotheses, due to ballast water and through the Brazilian current, which gets closer to the coast Winter.
Highlights
The paper describes the first occurrence of Pleopis schmackeri (Poppe, 1889) (Branchiopoda, Onychopoda) in Rio das Ostras, Rio de Janeiro, Brazil is described
The occurrence of P. schmackeri was observed during zooplankton survey carried out in the region of Rio das Ostras (22o32’048S and 41o50’922’W)
The zooplankton samples were obtained through horizontal surface hauls with a 200μm mesh network and an opening of 60cm in diameter in three stations, on July, 2003, with triplicates, and they presented a mean density of 10 ind.m-3
Summary
The paper describes the first occurrence of Pleopis schmackeri (Poppe, 1889) (Branchiopoda, Onychopoda) in Rio das Ostras, Rio de Janeiro, Brazil is described. Marine cladocerans present higher densities in coastal waters, but in a certain time of the year they can become rare (MARAZZO; VALENTIN, 2004). The Pleopis schmackeri (Poppe 1889) species has unknown ecological characteristics, due to low abundance and rare presence in tropical and coastal and tropical waters (MARAZZO, 2002).
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