Valuation of water pollution using enzymatic biomarkers in aquatic insects as bioindicators from El-Mansouriya stream, Dakahlia, Egypt

Abstract

This investigation was aimed to evaluate water pollution with heavy metals using three biomarkers, as well as the study of the aquatic insects-seasons interaction. Three species of aquatic insects collected from El-Mansouriya stream (Dakahlia, Egypt), during the different seasons from spring 2014 to winter 2015. Water samples, sediments and whole body of the three aquatic insects were analyzed for heavy metal contents. As well as, two enzyme biomarkers, Acetylcholinesterase (AChE) and glutathione-S-transferase (GST) were used to monitor aquatic insects' response to water pollutants. Results showed various activities of the three biomarkers at the different studied seasons. Where, the concentration of selected heavy metals, in the whole body of the three insects, showed a relatively wide range for each metal analyzed. Also, higher values of metal pollution index (MPI) were attained in hotter seasons (spring and summer) and its decrements were observable during cooler seasons (autumn, winter), that provides a representative picture to the environmental state of environmental impacts on the aquatic ecosystem. While the heavy metals were found to be highly accumulated in selected aquatic insects body, as well as the variation of enzymes activity, thus both enzymes could be used as biomarker of water and sediment contamination.

Effect of pollution with lead, cupper, cadmium on gene expression pattern of liver GST and serum lysozymes in Nile tilapia (Oreochromis. niloticus)

“…niloticus) in different localities in Delta Egypt as showing in table (1) There was very highly significant increase in lead level in G2 in organs of Nile tilapia fish (Oreochromis. niloticus)) more than G3,G4,G5,G6 is an indication for the presence of very high level of pollution in this area due to industrial waste effluents discharged from Talkha factory of fertilizers, Increasing lead level in G4 more than G3,G5,G6, is an indication also for the presence of very high level of pollution in this area due to agricultural and industrial waste effluents discharged from factories around Manzala lake..These results agree with the findings of [22]who found that level of trace elements within different tissues of fish mirrors amount of water pollution within ecosystem where these fish exist. [23] concluded that if environment obtains foreign pollutants like metals, the organisms existing within it can absorb pollutants from water or/and food and deposit it into their bodies.…”

Morphometric Comparison Between Different Populations of Darkling Beetles “Pimilia nilotica (Coleoptera: Tenebrionidae)” In Egypt

“…Palaeoclimatic cycles continually adjusted the boundaries between the desert, alternative environments, and their associated biodiversity (Dumont, 1982;Le Houerou, 1992;1997;Drake et al, 2011). Vicariance events associated with Saharan aridity episodes become the most diversification force for post-Pleistocene allopatry (Douady et al, 2003;Nyari et al, 2010;Bream et al, 2017). Such events are believed to result in allopatric isolation, which in turn induced the interruption of gene flow, and therefore the evolution of freelance lineages or new species.…”

A comparative biological study on Oreochromis niloticus from two Nilotic Canals in the Delta of Egypt

“…Due to the vital importance of water resources to human health and natural ecosystems, their qualitative and quantitative monitoring overtime would be of utmost importance (Tavakol et al, 2017). The environmental impacts in any aquatic ecosystems can be assessed and monitored by physical and chemical techniques and also by biological methods (Foil, 1989;Chae et al, 2000;Bream et al, 2017).…”