Phytoplankton structure and diversity in the eutrophic-hypereutrophic reservoir Paso de las Piedras, Argentina |
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Authors: | Carolina Fernández Elisa R Parodi Eduardo J Cáceres |
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Institution: | (1) CONICET-BB-IADO (Instituto Argentino de Oceanograf?a), CC 804, Camino La Carrindanga km 7.5, B8000FWB Bah?a Blanca, Argentina;(2) Laboratorio de Ecolog?a Acu?tica, Departamento de Biolog?a, Bioqu?mica y Farmacia, Universidad Nacional del Sur, San Juan 670, B8000ICN Bah?a Blanca, Argentina;(3) Laboratorio de Ficolog?a y Micolog?a, Departamento de Biolog?a, Bioqu?mica y Farmacia, Universidad Nacional del Sur, San Juan 670, B8000ICN Bah?a Blanca, Argentina |
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Abstract: | This study aimed at analyzing the phytoplankton structure and dynamics in Paso de las Piedras Reservoir, Argentina, through
the study of dominant species, diversity and similarity in relation with the abiotic environment. Samples were collected weekly
or biweekly (January 2004–June 2005) at four sampling stations. The reservoir experienced a seasonal progression in phytoplankton
composition that underlines six successional periods, each one characterized by the dominance of one or a few species. Cyanobacteria,
green algae and diatoms were the most important constituents of the reservoir’s phytoplankton. Cyanobacteria dominated during
summer and early autumn, green algae during late autumn and early winter, and diatoms during winter and spring. A high abundance
of R. lacustris (Cryptophyceae) was observed during late September and early October. The general pattern of species succession is coherent
with the general model of plankton seasonal succession described by the PEG model; however, the major discrepancy is the extremely
short clear water phase observed. Successional periods were associated with changes in abiotic variables, and they showed
differences in ecological traits. Cyanobacteria-Dictyosphaerium, Cyclotella, Stephanodiscus and Anabaena-diatom periods were
characterized by a low number of cells, high diversity, with both dominance and specific richness low. On the contrary, during
Cyanobacteria and Cyanobacteria II periods, the highest abundance was observed associated with low diversity and high dominance. |
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