Abstract
During July 2004, various limnological characteristics of 24 floodplain lakes and reservoirs have been explored along the Middle Daugava for the first time in order to reveal possible impact of the long-term mean annual flooding frequency on their phytoplankton, zooplankton, macrozoobenthos and macrophyta communities. Obtained data series were analysed by Spearman’s rank correlation method, Principal Component Analysis (PCA) method and Renkonen’s similarity test. UPMGA method was used for single linkage clustering of the lakes based on the abundance of phyto- and zooplankton taxa. Low similarity between the obtained cluster trees and hydrological grouping was stated indicating minor impact of the flooding hydrology on summer plankton communities of these lakes. Significant correlation between the flooding frequency and several physicochemical and biological parameters was found. Six main factors, which explain observed variations, were extracted by PCA. Significant negative impact of hydrological connectivity on zooplankton species diversity as well as positive impact on Oligochaeta density was stated, whereas other biotic parameters were affected by local factors, such as lake morphology, internal loading of nutrients from sediments, throphic interactions as well as local source of dissolved organic matter.
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Acknowledgements
This study has been supported by VPD1/ESF/PIAA/04/NP/3.2.3/0003/0065 project. The authors would like to thank Ecological Laboratory of Daugavpils Regional Environment Board for preparing chemical analysis of water samples.
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Gruberts, D., Druvietis, I., Parele, E. et al. Impact of hydrology on aquatic communities of floodplain lakes along the Daugava River (Latvia). Hydrobiologia 584, 223–237 (2007). https://doi.org/10.1007/s10750-007-0587-8
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DOI: https://doi.org/10.1007/s10750-007-0587-8