Taxonomy of Harpacticoida copepods in Ushuaia and Golondrina Bays, Beagle Channel, Argentina
Instituto de Histología y Embriología "Dr. Mario H. Burgos" (IHEM-CONICET)
Lugar: Mendoza; Año: 2007 vol. 3 p. 75 - 75
Taxonomy of harpacticoida copepods in UshuAia and Golondrina Bays, Beagle CHANNEL, argentina Biancalana F.1 and Veit-Köhler G.2 1Instituto Argentino de Oceanografía (IADO-CONICET), Camino La Carrindanga Km. 7,5, B8000FWB Bahía Blanca, Argentina. 2Forschungsinstitut Senckenberg, DZMB Deutsches Zentrum für Marine Biodiversitätsforschung. Südstrand 44, D-26382 Wilhelmshaven, Germany. e-mail: Harpacticoida copepods are second in abundance and species diversity in benthic marine habitats.This group frequently occurs in planktonic samples as occasional forms, particularly in shallow and algae-covered coastal waters. Several shallow coastal zones in Ushuaia and Golondrina bays, are characterized by the presence of dense macroalgae beds in which Macrocystis pyrifera is the dominating species. The latter serves as a substratum to a large number of organisms such as harpacticoid copepods, amphipods and isopods. The aim of the present study was to taxonomically identify the harpacticoid copepods found in mesozooplankton samples from both bays. Samples were collected in both bays (54º79’, 54º85’S - 68º22’, 68º36’W) during August and December 2004. A Nansen net (0.30 m mouth; 200 μm mesh) and oblique tows were used for the collection. Copepods were identified at the lowest possible taxonomic level using a Leica DMLS2 stereomicroscope and an M Leica MZ 9.5 optical microscopy. Taxa of 13 harpacticoid families were identified in 24 samples. The species found in 10 of these families belonged to 15 genera. The families Tisbidae, Porcellidiidae and Thelastridae were dominant in the study area (with 75%, 62.5% and 58.33% frequency of occurrence, respectively). Ameiridae, Canthocamptidae and Idyanthidae played a minor role, not reaching 4.16% each one. The genus Porcellidium showed the highest frequency of occurrence (62.5%) while Tisbe and Scutellidium showed 50%. Three new species belonging to the genera Mesochra, Idyanthe and Scutellidium were found in both bays. This study is the first record of the taxonomy and occurrence of harpacticoid copepods in Ushuaia and Golondrina Bays.