Graduate Thesis Or Dissertation
 

The phytoplankton and limnological characteristics of Lago Rupanco, Osorno, Chile

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  • Lago Rupanco is located in the central plain of Chile (Borgel, 1964) at 40° 50' S; 72° 30' W. It lies at 117 m above sea level, and corresponds to type 28c of Hutchinson's (1967) classification. Lago Rupanco is a warm, monomictic lake, with winter circulation and summer stratification. Physical, chemical and biological parameters of this lake were studied during a cycle of 18 months for the first time in 1981-1982. Lago Rupanco has a maximum depth of 160 m. The euphotic zone was sampled and the temperature ranged from 10 to 18 C with an oxygen content between 9 and 11 mg/1. This lake had small amounts of nitrate-nitrogen and phosphate-phosphorous, as is characteristic of oligotrophic lakes. The phytoplankton was analyzed qualitatively and quantitatively. A total of 84 taxa was identified. Maximum and minimum values of phytoplankton relative abundance occurred in spring and fall, respectively. The phytoplanktonic biomass was at its maximum in summer and at its minimum in fall. Four species were the most abundant, Melosira granulata, Sphaerocystis schroeteri, Botryococcus braunii and Dinobryon divergens. Seasonal succession among the Bacillariophyceae, Chlorophyceae and Chrysophyceae was observed. The relationships between abiotic factors and the phytoplankton standing crop are discussed.
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