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vol.37 número1POLEN FÓSIL DE ISLA REY JORGE (ANTÁRTICA) Y CHILE CONTINENTAL, AFIN A PROTEACEAE CHILENASESTRUCTURA COMUNITARIA DEL TAXA FORAMINIFERIDA (PROTOZOA), SEGÚN PROFUNDIDAD, EN EL FIORDO COMAU, CHILOÉ, CHILE índice de autoresíndice de materiabúsqueda de artículos
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Anales del Instituto de la Patagonia

versión On-line ISSN 0718-686X

Resumen

HROMIC, Tatiana. BATHYMETRIC DISTRIBUTION OF BENTHIC FORAMINIFERA (PROTOZOA: FORAMINIFERIDA), SOUTHERN MAGELLAN STRAITS (52°-56°S), CHILE. Anales Instituto Patagonia (Chile) [online]. 2009, vol.37, n.1, pp.23-38. ISSN 0718-686X.  http://dx.doi.org/10.4067/S0718-686X2009000100003.

Bathymetric distribution of benthic foraminifera from the southernmost part of the Chilean chan-nels and fiords (52 - 56°S) was analyzed. Thirty four samples were collected from the Magallanes shelf, south of the Magellan Strait (35 - 650 m). During the Cimar 3 Fiord cruise (1998) organized by the Comité Oceanógrafico Nacional (CONA). 21.190 specimens were collected and classified into 169 spe-cies. Only 8.3% of species had an abundance of more than 2% and 47 species were selected according to their abundance to verify their distribution. Three associations are described: a) shallow water (0-150 m). In the upper layer (0-50 m) BucceUa frigida, Buliminella elegantissima and Discorbis berthelothi were found. Between 50m and 100 m, Cibicides dispars, BucceUa frigida and Ammonia beccarii were abundant and, in the inner part, Anguíogerina angulosa and Ehrenbergina pupa were found. b) Intermedíate water (150 - 350 m); Uvigerina brunnensis, Buíimina notovata and Nonionoides grateíoupi were common between 150 - 200 m. The most abundant species between 200 and 250 m were Nonionoides grateíoupi, Buíimina notovata and Oridorsaíis tener. Anguíogerina angulosa, Cassiduíina carinata and Globocassidulina rossensis were found in the deepest water of this layer (250 y 300 m). c) deep water (>350 m). Oridorsaíis tener and Cibicides refulgens were the main species present and Discanomalina vermiculata, Cibicides refulgens and Anguíogerina angulosa were also found. Anguíogerina angulosa, Anguíogerina carinata and Cassiduíina laevigata were found in the deepest part of the Magellan shelf (below 600 m).

Palabras clave : Benthic foraminifers; bathymetric distribution; Southern Magellan Strait.

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