Some aquatic insects and invertebrates as bioindicators for the evaluation of bacteriological pollution in El-Zomor and El-Mariotya canals, Giza, Egypt

Abstract

Some aquatic insects and invertebrates were used for monitoring the effect of bacteriological pollution upon water quality during two years (October, 2001-August, 2003 at six sampling sites situated at El-Zomor and El-Mariotya canals (branches from the River Nile), Giza Governorate, Egypt. Results obtained revealed that 5 species of bacteria (Escherichia coli, Klebsiella pneumonia, Enterococcus faecalis, Streptococcus faecium & Proteus mirabilis) were detected from water samples. K. pneumonia, S. faecium and P. mirabilis were not detected at IIIZ site and; S. faecium was not detected at IIZ sampling site. Meanwhile only two species (E. coli & E. faecalis) were detected in all El-Mariotya canal sampling sites. E. coli & E. faecalis showed high bacterial counts during summer months. The bacterial species isolated from aquatic insects belong to different orders mainly Diptera; Ephemeroptera and Odonata; however, there is no isolation of bacteria from aquatic invertebrate belonging to orders Cladocera & Cyclopoida. The 5 bacterial species that were detected in the water samples were isolated from the collected aquatic insects at IZ sampling site, while at IIZ sampling site 4 species (E. coli, K. pneumonia, E. faecalis & P. mirabilis) and only two species (E. coli & E. faecalis) at IIIZ sampling site. However, only 2 species of bacteria (E. coli & E. faecalis) were isolated from El-Mariotya canal. It is clear that some aquatic stages of Diptera, Ephemeroptera and Odonata could be selected as bioindicator of water bacterial pollution.

Biodiversity and seasonal fluctuation of aquatic and semiaquatic insects in Rashid stream, kafr El Zayat (Gharbyia governorate)

“…By observing the presence & absence of sensitive organisms from a habitat, the level of pollution can be estimated (Paparisto et al, 2008). Biological assessments of human and environmental impacts on water quality and aquatic organisms have been used since the early 1900s; since 1972, many research institutions have been developing various techniques to measure the health of the country's water (Hu et al, 2007;Stein et al, 2008;Adham et al, 2009;Paparisto et al, 2010). From these techniques the use of macroinvertebrate which are an ideal indicators to assess water quality has become a standard addition to many countries; aquatic insects as bioindicators for water pollution is less expensive than the evaluation of physical and chemical parameters used in assessing quality (Arimoro & Ikomi, 2009;Trigal et al, 2009;Lili et al, 2010); aquatic insects also play an important ecological role in nitrogen remobilization by eating small organisms and being consumed by other animals and fishes (Shabrawy et al, 2007).…”