Bioaccumulation of heavy metals in freshwater snails in relation to lining of water courses in Egypt.

Abstract

The present study was aimed to determine the heavy metal concentrations in whole body of fresh water snails in relation to lining of water courses in two governorates (Behaira (Nubaria) and Giza) Through four successive seasons from Septemper 2013, to October 2014. The obtained results indicated that the electrical conductivity (EC) and iron metal (Fe) showed the highest values and generally the physicochemical measurements indicated that no significant difference between the two tested habitats, however, the conductivity of water in lined water bodies was lower than those of unlined ones. The present study recorded 14 species of snails belonging to class Gastropoda; these species belonged to Pulmonate and Prosobranch snails. The density of all recorded Pulmonate snails in lined sites were lower than those in unlined ones. On the other hand, the abundance of Prosobranch snails was higher in numbers in the lined sites than those in the unlined. In Nubaria the most abundant snails were Melanoides tuberculata and Theodoxus niloticus and exhibited their maximum percentages in the lined (82.15%) and unlined (72.34%) sites during summer, respectively. While, in Giza Governorate Physa acuta snails had the highest percentages among collected snails approximately at all seasons, and exhibited its maximum percentages during spring in lined (90.22%) and unlined sites (85.38%). Correlations between physicochemical parameters and the collected snails, revealed that there were different negative or positive correlations depending on the sites of investigation. The bioconcentration factor of heavy metals in snail's soft tissues at the investigated in lined and unlined sites compared to the content of the metals (Cd, Cu, Fe, Pb and Zinc) in the water showed high variation in BCF values depending on the type of metal and the snail. Generally P. acuta (7626.95μg.g-1 DW for Fe) and H. duryi (8787.10 μg.g-1 DW for Cu) were the highest snails of accumulated metal contents in the tested sites of the two surveyed governorates, respectively.

Biomonitoring of manganese metal pollution in water and its impacts on biological activities of Biomphalaria alexandrina snail and larvicidal potencies

“…The bioaccumulation of Mn heavy metal in H. duryi tissue was higher than that in tissues of P. acuta and B. alexandrina snails. These results were in good accordance with Abdel Kader et al ( 2016 ) who found that P. acuta and H. duryi were the highest snails that could accumulate heavy metals in their tissue and reasoned the high variation in BAF values depended on the type of the snail and the metal. The present results showed that BAF is higher than one in the three snails type and this indicated that these snails were tolerant (Liao et al 2003 ; Ávila et al 2017 ; Kachenga et al 2020 ).…”

“…Determination of heavy metals in water samples and snail’s tissues was performed by using atomic absorption spectrophotometry (AAS) in Environmental Research Laboratory, Theodor Bilharz Research Institute (TBRI), according to the method of Abdel Kader et al ( 2016 ). Analysis of heavy metals in water: For the analysis of total heavy metals, water samples (200 ml) were digested with 5 ml of acidified concentrated nitric acid (HNO3) on a hot plate and filtered by Whatman No.…”

Impacts of Climate Change on Water Quality using GIS Technique in Water Courses at Egyptian Delta Governorates

“…Water samples (200ml) were digested with 5ml of di-acid mixture (9 HNO 3 : 4 HCIO 4 ) on a hot plate and filtered by Whatman No. 42 filter paper, and double distilled water was added to bring the volume up to 50ml, following the method outlined by Abd El- Kader et al (2016). Determination of heavy metals in water samples were performed by atomic absorption spectrophotometer, according to the guidelines of A.O.A.C.…”

Biological Indicators for Pollution Detection Using Two Freshwater Snails, Biomphalaria alexandrina and Lanistes carinatus in Egypt

“…Initial digestion was conducted at room temperature for 4h, followed by heating at 40-45°C for 1h in a water bath and then raised to 70°C until the end of digestion. After cooling at room temperature, each digested sample was diluted to 60ml with deionized water and filtered out into a volumetric flask for analyzing heavy metals (Mahmoud & Abu Taleb, 2013;Abdel Kader et al, 2016).…”