Plankton and hydrochemistry of Lake Futalaufquen (Patagonia,Argentina) during the growing season |
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Authors: | L. Pizzolon N. Santinelli M. C. Marinone S. A. Menu-Marque |
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Affiliation: | (1) Laboratorio de Ecología Acuática, Universidad Nacional de la Patagonia, 9200 Esquel, Chubut, Argentina;(2) Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia, 9100 Trelew, Chubut, Argentina;(3) Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, 1428 Buenos Aires, Argentina |
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Abstract: | Plankton communities and hydrochemistry of an oligotrophic lake occupying a glacial valley in Argentinian Patagonia (42 °49S; 71 °43W) were studied. Monthly samples at three stations integrated from 0 to 50 m and stratified samples at the site of maximum depth, were taken during the growing season. Transparency was always controlled by glacial silt, and not by phytoplankton. Lake water belongs to the calcium-bicarbonate type, with low conductivity (24 µS cm–1), and poor buffering capacity. Forty-five phytoplankton taxa were found. Mean phytoplankton density was 49 cells ml–1 and mean biomass 69 µg l–1. N:P relationships, inorganic nitrogen exhaustion in the photic layer, and correlations between nutrients and phytoplankton density suggests nitrogen as the main limiting factor. Fifteen zooplankton species were found. Mean zooplankton density was 12.2 ind. l–1 and mean biomass 22.9 µg l–1. Diatoms and Boeckellidae were the dominant planktonic groups. Morphometry and hydrological factors were responsible for horizontal heterogeneity in phytoplankton and chemical variables. |
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Keywords: | Patagonia oligotrophy nitrogen limitation phytoplankton zooplancton spatial heterogeneity |
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