Family Variation of Aquatic Insects and Water Properties to Assess Freshwater Quality in El-Mansouriya Stream, Egypt

摘要: The use of family variation aquatic insects in assessing freshwater quality ecosystems has only recently been applied the northern parts Africa. current study along with El Husseiny et al. (2015) and Bream (2017) can be considered first such studies Egypt. survey was conducted during period April 2015 to February 2016, permanent stream, El-Mansouriya, Dakahlia province, water health status for human this stream determined using different invertebrate biotic indices formulations (BMWP, SWRC EPT indexes) physical chemical properties. Water samples were analysed parameters compared WHO (2004) standards. Most found within permissible limits, except turbidity nutrient salts. Aquatic collected identified order levels. A total seven orders 19 families collected, including a few intolerant (EPT orders) more tolerant pollution (chironomid larvae). values sampled showed significant correlations insect diversity. canonical correspondence analysis clarified that electrical conductivity most variable affecting taxa. From these results it seen is moderately impacted, could therefore harmful, since main supply Central Station Aga. degradation generally due impacts associated population growth, industrialisation agricultural activities. These used assist conservation planning decision-making