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Investigaciones marinas

versión On-line ISSN 0717-7178

Resumen

HROMIC, Tatiana. Latitudinal distribution of suborder and family levels of benthic foraminifers (Protozoa: Foraminiferida), in Chilean Patagonian channels and fjords. Investig. mar. [online]. 2006, vol.34, n.1, pp.71-81. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71782006000100006.

The latitudinal distribution of benthic foraminifers is studied at the levels of suborder and family. 106 samples were collected on the continental shelf (50-300 m) between 43ºS and 55ºS in the area of channels and fjords, eastern South Pacific, during Cimar Fiordos Expeditions 2, 3, 7 and 8. The foraminifers (50,480 specimens) were classified in 5 suborders, 46 families and 228 species. The number of suborders, families, and the families by suborder do not depend on the latitudinal gradient. Likewise, abundance at the suborder and family levels does not fluctuate with latitude. A major change was observed at 44ºS (Baeza and Memory channels), where the number and abundance of suborders and families, species richness, and diversity decreased drastically. The same occurred between 46º and 48º S (Steffen and Mitchell estuaries and Escape channel). This may suggest that local events, such as oceanic currents, could be more important than latitude in controlling microfauna distribution patterns

Palabras clave : benthic foraminifers; continental shelf; istribution; Patagonic channels and fjords; Chile.

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