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vol.38 issue1ALEXANDRIUM CATENELLA (WHEDON & KOFOID) BALECH, 1985, IN MAGELLAN WATERS, CHILEEL NIÑO AND THE BIRDS: A RESOURCE-BASED INTERPRETATION OF CLIMATIC FORCING IN THE SOUTHEASTERN PACIFIC author indexsubject indexarticles search
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Anales del Instituto de la Patagonia

On-line version ISSN 0718-686X

Abstract

DE LOS RIOS, Patricio; SOTO, Doris  and  MANSILLA, Andrés. ZOOPLANKTONIC COMMUNITIES IN LAKES FROM TORRES DEL PAINE NATIONAL PARK: A REASSESSMENT OF REGULATING FACTORS ON COMMUNITY STRUCTURE. Anales Instituto Patagonia (Chile) [online]. 2010, vol.38, n.1, pp.111-119. ISSN 0718-686X.  http://dx.doi.org/10.4067/S0718-686X2010000100008.

The Torres del Paine National Park is characterized by the presence of numerous water bodies, such as large oligotrophic lakes, small lakes with fishes, and small shallow ponds. The published studies, based on data obtained between 1989 and 1991, indicates that species richness is inversely related with the conductivity and directly related with chlorophyll concentration. The present study consisted of an analysis from unpublished data obtained during 2001, where it was also considered the dissolved organic carbon concentration as a potential protector against natural ultraviolet radiation penetration, reported during the last two decades. The results were similar to the first studies on the role of chlorophyll concentration and conductivity as regulators of species richness, and in the present study was denoted that the species richness was directly related with dissolved organic carbon concentration. The maximum species richness was observed in mesotrophic status, low conductivity and high dissolved organic carbon concentration. These results agree partially with co-occurrence null model analysis.

Keywords : mesotrophy; oligotrophy; conductivity; zooplankton; dissolved organic carbon.

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