Abstract
Impact of physicochemical parameters on 2 compositions and abundances in Selameko Reservoir, Debre Tabor, South Gondar from August 2009 to May 2010 was assessed. Water quality parameters, such as temperature, water transparency, water depth, dissolved oxygen, pH, total dissolved solids, phosphate, nitrate, and silicate were measured in situ from two sites (littoral and open water zone) of the reservoir. Phytoplankton compositions and abundances were analyzed in Tana fisheries and other aquatic organisms’ research center. ANOVA result of the physicochemical parameters included chlorophyll-a showed the presence of significance difference among seasons and between sites (P < 0.05). A total of seven families, 36 genera from three groups (Diatom, Blue green algae and Green algae) of phytoplankton were identified during the study period. From all groups, diatoms were the most abundant at both sites and Blue green algae were the least abundant. ANOVA of all phytoplankton showed highly significant difference among seasons and between sites (P < 0.05). ANOVA of all phytoplankton showed highly significant difference among seasons and between sites (P < 0.05). Based on the stepwise regression, a total number of phytoplanktons had positive correlation with some of the physicochemical parameters (R2 = 0.99, P < 0.001, N = 16). The study concluded that some of physicochemical parameters (NO3-N and PO4-P) indicated the presence of reservoir water pollution. This is supported by the presence of pollution-resistant phytoplankton species such as Melosira and Microcystis. The reservoir water was eutrophic (productive) throughout the year. To avoid such pollution, basin and reservoir management are recommended.
Highlights
Phytoplankton are free-floating uni-cells and colonies that grow photoautotrophically in aquatic environments
This work was aimed to determine the impacts of physicochemical parameters on the phytoplankton compositions and abundances in Selameko manmade reservoir, Debre Tabor, South Gondar, Ethiopia
Temperature of the reservoir water ranged from 18.7 °C (PORS, SI) to 24.2 °C (DS, SI and SII, pre-rainy season (PRS), SII)
Summary
Phytoplankton are free-floating uni-cells and colonies that grow photoautotrophically in aquatic environments. Phytoplankton play a key role in the primary production and global nutrient cycles of the Earth (Daniel 2001) by making up the main producers in any given water body (Biddanda and Benner 1997). It colonizes the upper part of the water column, down to the limit of penetration of light. Phytoplankton communities are sensitive to changes in their environment and phytoplankton total biomass and many phytoplankton species are used as indicators of water quality (Reynolds et al 2002; Brettum and Andersen 2005). This work was aimed to determine the impacts of physicochemical parameters on the phytoplankton compositions and abundances in Selameko manmade reservoir, Debre Tabor, South Gondar, Ethiopia
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