Phenotype and temperature affect the affinity for dissolved inorganic carbon in a cyanobacterium <Emphasis Type="Italic">Microcystis</Emphasis> |
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Authors: | Xinghua Wu Zhongxing Wu Lirong Song |
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Institution: | 1.Faculty of Science,University of South Bohemia,?eské Budějovice,Czech Republic;2.Biology Centre of AS CR, v.v.i., Institute of Hydrobiology,?eské Budějovice,Czech Republic |
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Abstract: | In order to evaluate the effects of contrasting hydrological scenarios on the spatial and temporal heterogeneity of phytoplankton
in a reservoir, vertical chlorophyll and temperature profiles were measured and functional classification of phytoplankton
was applied. From April to October 2007, at 1–2 week intervals, seasonal changes in various parameters were studied along
the longitudinal axis of the canyon-shaped, eutrophic Římov Reservoir (Czech Republic). At the river inflow, phytoplankton
markedly differed from the rest of the reservoir, being dominated by functional groups D and J (pennate diatoms and chlorococcal
algae) without a clear seasonal pattern. From April to mid-June, groups Y and P (large cryptophytes and colonial diatoms)
prevailed in the whole reservoir. Phytoplankton spatial heterogeneity was the most apparent during the summer reflecting a
pronounced gradient of environmental parameters from the river inflow to the dam (e.g., decreasing nutrients, increasing light
availability, etc.). A dense cyanobacterial bloom (groups H1 and M) developed in the nutrient-rich transition zone, while
functional Group N (desmids) dominated the phytoplankton at the same time at the dam area. In late summer, a sudden flood
event considerably disrupted thermal stratification, altered nutrient and light availability, and later even resulted in cyanobacterial
dominance in the whole reservoir. Additionally, our study emphasizes the importance of having an intensive phytoplankton monitoring
program, which would allow for detecting severe consequences of sudden flood events on phytoplankton spatial and temporal
heterogeneity, which significantly affect water quality at the dam area used for drinking water purposes. |
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