| Pak. J. Bot., 18(1): 137-145. | Back to Contents | ||||
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Updated: 10-12-12 | ||||
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BIOASSAY STUDIES OF PHYTOPLANKTON OF COASTAL WATERS OF KARACHI IN
RELATION TO HEAVY METAL POLLUTION: I. EFFECT OF COPPER AND LEAD ON
SKELETONEMA COST ATI]M SHAUKAT HAY AT KHAN1 AND S.M. SAIFULLAH2 Abstract: Toxic effects of copper and lead on a local diatom species Skeletonema costatum were studied using bioassay technique. Copper inhibited growth at a concentration of 10 Mg Cu I 1 and killed the cells at and above 30 Mg Cu l"1. Lead inhibited growth, the lowest tolerance limit being 50 Mg Pb l"1. The effect of both metals increased with age of culture and a significant inverse relaŽtionship existed between their concentrations and growth of the spccies. The combined effect of copper and lead on the species was synergistic. Centre of Excellence in Marine Biology, University of Karachi, Karachi-32, Pakistan. |
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