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JOURNAL OF PLANKTON RESEARCH | VOLUME 12 | NUMBER 2 | PAGES 415-422 | 1990
© Oxford University Press

research-article

The size-abundance distribution and taxonomic composition of plankton in an oligotrophic, high mountain lake (La Caldera, Sierra Nevada, Spain)

Fidel Echevarría, Presentación Carrillo1, Francisco Jimenez, Pedro Sanchez-Castillo2, Luis Cruz-Pizarro1 and Jaime Rodriguez

Unidad de Ecología, Universidad de Málaga 29071-Málaga 1Departamento de Biología Animal, Genéticay Ecología, Universidad de Granada Spain 2Departamento de Biología Vegetal, Universidad de Granada Spain

Received on July 7, 1989; accepted on November 9, 1989 In this paper we describe the main features of the size-abundance distribution and taxonomic structure of plankton in an oligotrophic, high mountain lake (La Caldera, Sierra Nevada, Spain). The distribution is characterized by a discontinuity in the size range between {small tilde}2000 and 32 000 µm3 (cell volume). Phytoplankton are numerically dominated by the cyanobacteria Cyanarcus sp., followed by the chrysophyte Chromulina nevadensis and the diatom Cyclotella ocellata. Some microplanktonic species such as the diatom Navicula radiosa were observed sporadically. The size spectrum and composition of the zooplanktonic community are dominated by the copepod Mixodiaptomus laciniatus. On considering biomass, however, the maximum values are associated with the largest size classes, dominated by the cladoceran Daphnia pulex. Both the size structure and taxonomic composition of the planktonic community studied are consistent with expectations based on theories relating the pattern of energy flow and trophic status in lakes.


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