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Foraminíferos (PROTOZOA: FORAMINIFERIDA)de la superfamilia BULIMINACEA JONES 1875, en canales y fiordos patagónicos, Chile

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Author
Hromic, Tatiana
Zúñiga, Mireya
Date
2003

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Alternative Title
BULIMINACEA super family foraminifers JONES 1875, (PROTOZOA:FORAMINIFERIDA) in patagonics channels and fjords, Chile
Abstract
En la región de canales y fiordos patagónicos del Pacífico sudoriental, Chile (42º - 56º S) se obtuvieron 12.343 ejemplares de la superfamilia Buliminacea Jones, 1875 (Protozoa: Foraminiferida), siendo clasificados en 4 familias, 6 géneros y 17 especies. Los foraminíferos fueron extraídos durante las expediciones Cimar 2 Fiordos, Cimar 3 Fiordos, Cimar 7 Fiordos, Cimar 8 Fiordos, organizadas por el Comité Oceanográfico Nacional (CONA) en el área comprendida entre 44º y 56º S. Los taxones con mayor representación fueron las familias Uvigerinidae y Buliminidae, las cuales alcanzaron un 79,9% y 18,2% respectivamente. Además, destacaron la abundancia de las especies: Angulogerina angulosa (67,9%) y Globobulimina notovata (13,1%). La distribución geográfica mostró que los uvigerínidos tienden a ocupar las zonas externas de canales y fiordos patagónicos con características oceánicas, mientras que los bulimínidos fueron más abundantes en el interior de los fiordos, con aguas de tipo estuarino. Las especies que lograron una mayor distribución en el área de estudio fueron A. angulosa y Globobulimina notovata, encontradas en el 45,2% y 35,7% de las estaciones respectivamente. Respecto de la distribución batimétrica no se observó un patrón; sin embargo, los bulimínidos prefirieron aguas más profundas, al menos por debajo de los 100 m.
A total of 12.343 specimens of the Buliminacea Jones, 1875, super family (Protozoa: Foraminiferida) were collected in the channels and fjords of the Patagonian Region in the south east Pacific, Chile (42º - 56º S). They were classifided in four families, six genera and seventeen species. Sediments samples were taken during three expeditions: Cimar 2 Fiordos, Cimar 3 Fiordos, Cimar 7 Fiordos, Cimar 8 Fiordos, all of them organized by the Comité Oceanográfico Nacional (CONA) to the area between 44º and 56º S. In terms of abundance, the most representative groups were Uvigerinidae and Buliminidae families with 79,9% and 18,2% respectively, standing out between them Angulogerina angulosa (67,4%) and Bulimina notovata (13,5%). Geographical distribution shows that uvigerinids tend to be more abundants in the outer part of the channels and fjords, were enviroment presents oceanic characteristics, while Buliminidae are more abundants in the inner parts of the fjords (estuarine water). A. angulosa and Globobulimina notovata presents the highest distribution in the study area with 45,2% y 35,7% of frecuency respectively. With regard to bathimetric distributions, there is no apparent pattern for this. However, Buliminacea seem to prefer deeper waters, at least under 100 meters.
Journal
Anales del Instituto de la Patagonia
Issue/Article Nr
31
Publisher or University
UMAG, Punta Arenas (Chile)
URI
http://hdl.handle.net/1834/4339
Collections
1. Anales del Instituto de la Patagonia

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