Long-term variations of zooplankton community in Lake Edku, Egypt | ||
| Egyptian Journal of Aquatic Biology and Fisheries | ||
| Article 18, Volume 23, Issue 4, October 2019, Pages 215-226 PDF (829.42 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2019.53997 | ||
| Authors | ||
| Howaida Y. Zakaria; Hussein A. El-Naggar | ||
| Abstract | ||
| Lake Edku receives huge amounts of waste waters discharged from various effluents that could be affecting on its ecological and biological features. Samples were collected seasonally for seven subsequent years (2009 - 2015) from 9 stations represent the different habitats in Lake Edku to assess the ecological status of the lake through long-term variations of zooplankton community. The data of physico-chemical parameters indicated that some parameters had wide variations in yearly average and others changed within narrow range. Lake Edku is considered among the highly eutrophic lakes as the average values of Chlorophyll- a concentrations all over the study period always higher than the eutrophication level. Zooplankton community in the lake comprised 77 species. Rotifera and Copepoda were the most abundant and diversified groups. Long-term variations of zooplankton abundance and diversity indicated that the lake is in continuous degradation. This also confirmed by the dominance of rotifer species belonging to genera Brachionus, Polyarthra, Keratella and Filinia which were considered as bio-indicators of organic pollution. However, it would be concluded that Lake Edku is highly eutrophic basin, under severe conditions and their ecological status is too bad and needs repair. | ||
| Keywords | ||
| Zooplankton; Long-term variations; diversity; Lake Edku; Egypt | ||
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