Seasonal variation of physico-chemical characteristics of water, using diatoms as a bio-indicator and diversity index of water quality, district Mardan, KP, Pakistan

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Research Paper 01/03/2018
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Seasonal variation of physico-chemical characteristics of water, using diatoms as a bio-indicator and diversity index of water quality, district Mardan, KP, Pakistan

Mursaleen, Syed Zahir Shah, Liaqat Ali
J. Bio. Env. Sci.12( 3), 50-59, March 2018.
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The present research work was conducted to study the impact of water on diatoms growth in different seasons. Diatoms are excellent indicators and used for the assessment of water quality of district Mardan, KP, Pakistan. Algal and water samples were collected in different seasons during the year 2016. A total of 78 species and 27 genera of diatoms were isolated. Results revealed that maximum number of diatoms (49 species) were recorded in winter followed by autumn (39 species) summer (22 species) to the minimum (17 species) in spring. This may be attributed to the presence of favourable nutrients requirement in winter, autumn and summer than spring resulted in maximum number of diatoms. This fact may revealed that water in winter and autumn receiving more effluents from residential areas and industries than summer and spring that positively promoted the diatoms growth. Most dominant species of diatoms were reported for the genera Navicula, Nitzschia, Cymbella, Gyrosigma and Ghomphonema. Water was analysed for their physicochemical properties: temperature (12.5–31.7˚C), pH (8.7–9.2), turbidity (59.6–156 NTU), TDS (158.6–414 mg/l), TSS (100–212 mg/l) and electrical conductivity (341–435 μS/cm) were calculated. Diversity of the diatoms species was calculated through Margalef index (d), Pielou’s evenness index (J′), Simpson’s index (D) and Shannon-Wiener index (H′). Statistical analysis showed that temperature and total dissolved solids were highly significant while pH was only significant in diatoms growth. The growth of diatoms showed positive correlation with total dissolved solids, electrical conductivity and total suspended solids.


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