Počet záznamů: 1  

Spatial heterogeneity and seasonal succession of phytoplankton along the longitudinal gradient in a eutrophic reservoir

  1. 1. 0360225 - BC-A 2012 RIV NL eng J - Článek v odborném periodiku
    Rychtecký, Pavel - Znachor, Petr
    Spatial heterogeneity and seasonal succession of phytoplankton along the longitudinal gradient in a eutrophic reservoir.
    Hydrobiologia. Roč. 663, č. 1 (2011), s. 175-186 ISSN 0018-8158
    Grant CEP: GA ČR(CZ) GP206/07/P407; GA ČR(CZ) GA206/08/0015
    Výzkumný záměr: CEZ:AV0Z60170517
    Klíčová slova: phytoplankton * reservoir * spatial heterogeneity * seasonal succession * functional classification * f lood event
    Kód oboru RIV: DA - Hydrologie a limnologie
    Impakt faktor: 1.784, rok: 2011

    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 (pinnate 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.
    Trvalý link: http://hdl.handle.net/11104/0197824