INVESTIGADORES
GIBERTO Diego Agustin
congresos y reuniones científicas
Título:
Benthos of the Argentinean Continental Shelf: faunal assemblages, species distribution and richness along a latitudinal gradient
Autor/es:
BREMEC, C.S.; SCHEJTER, L.; GIBERTO, D.A.; ESCOLAR, MARIANA; SOUTO, VALERIA; ACHA, E. M.; MIANZAN, H.
Lugar:
Valencia, España
Reunión:
Congreso; World Conference on Marine Biodiversity; 2008
Resumen:
<!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:-1610611985 1107304683 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:ES; mso-fareast-language:ES;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> The aim of this study was to assess benthic species composition and richness considering their spatial distribution and density, according to a latitudinal gradient in the Argentine Sea. The study area is located between 37º-44ºS and 80-130m depth, with homogeneous soft bottoms. The epibenthos is dominated by Zygochlamys patagonica and associated invertebrates. We studied material from 167 samples obtained during 2007. In the case of Porifera, Hydrozoa (taxonomic resolution difficult) and scallop epibionts, we used previous information. A total of 129 species were registered in the study area, 90 of which were identified in our samples. Sponges and hydroids reached a total of 19 and epibionts 20 species. Most of the species were widely distributed, some showed disrupted or rare presence. Sample diversity estimates do not show a latitudinal gradient. Differences in structure of the conspicuous assemblage along the latitudinal range are attributed to variable density of the taxa. We emphasize the subantarctic origin of the fauna, related with the highly productive waters at the shelf break frontal system. This study was partially financed by Inidep, Pict15080 and 1553, Conicet5009.