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- Title
Phytoplankton assemblages in a Brazilian subtropical cascading reservoir system.
- Authors
da Silva, Claudinéia Almedia; Train, Sueli; Rodrigues, Luzia Cleide
- Abstract
Variations in the structure and dynamics of a phytoplankton community were determined during two periods in 2001, along five cascading reservoirs of the Iguaçu River, Paraná State (Brazil). The vertical dynamics of the phytoplankton was related to underwater light availability and the water column-mixing regime. Correlations between physical and chemical variables and phytoplankton abundance were evaluated by Canonical Correspondence Analysis (CCA). No significant cascading effect throughout the serial reservoirs was obtained. Thus, the main factor affecting the structure of the phytoplankton assemblages of each reservoir was the hydrodynamic pattern. The instability of the water column during the winter favored the development of R-strategist species such asAulacoseira granulata, Urosolenia longisetaandU. eriensisin most reservoirs. In the period of the highest hydraulic stability and temperature, the greatest contribution to biomass came from Cyanophyceae S-strategists such asAphanocapsasp.1,Anabaena planctonicaandA. crassa. The phytoplanktonic associations recorded were important indicators of the environmental conditions of these reservoirs.
- Subjects
PHYTOPLANKTON; PLANKTON; ALGAE; UNDERWATER light climate; BIOMASS; NOSTOCACEAE
- Publication
Hydrobiologia, 2005, Vol 537, Issue 1-3, p99
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-004-2552-0