2 research outputs found
Development of Abundance -Biomass Curves Indicating Pollution and Disturbance in Molluscan Communities on Four Beaches Near Karachi, Pakistan
No full textAbstract.-The abundance and biomass of rocky intertidal molluscs at four study sites along the Karachi coast were examined on quarterly basis, for a period of two years from December 1993 to December 1995 with reference to tidal level. Various stresses such as over-exploitation, pollution, industrialization and development of public facilities are known to affect adversely on the coastal fauna. Abundance / biomass comparison (ABC) plots showed undisturbed or unpolluted condition throughout the investigation period at Cape Monze. Nathiagali was unpolluted in most of the samples except in spring and autumn of first year. However, Manora and Buleji showed moderately disturbed or moderately polluted condition throughout the study period. At Nathiagali, the ABC curves generally show moderately disturbed condition at all tidal levels in most of the samples. The ABC curves in the low tidal zone generally show unpolluted or undisturbed condition in most of the samples at Manora and Buleji rocky shores. On the contrary, mid and high tidal zones of both sites indicates the moderately polluted situation during the whole study period
Monthly Variations of Physico-Chemical Factors of Keenjhar Lake, Sindh, Pakistan: Monthly Variations of Physico-Chemical Factors of Keenjhar Lake, Sindh, Pakistan
No full textThe present study was carried out with the aim to assess water quality using physico-chemical factors of Keenjhar lake. For this purpose, lake water was analyzed with regular intervals. The air temperature ranged between 21 °C to 38 °C, water temperature between 19 °C to 36 °C , pH 5.5 to 8, dissolved oxygen 2.26 mg/L to 6.81 mg/L, salinity 0.16 mg/L to 1.13 mg/L, alkalinity from 30 mg/L to 165 mg/L, acidity 8 to 110 mg/L, sulphate 2.6 mg/L to 310 mg/L, phosphate from 1 mg/L to 31 mg/L and nitrates 16 mg/L to 180 mg/L during 2006, 2007 and 2008. It was concluded that various parameters lie within the permissible range except in a few months and suitable for drinking, irrigation and fish culture purposes
