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JOURNAL OF PLANKTON RESEARCH | VOLUME 1 | NUMBER 2 | PAGES 121-136 | 1979
© Oxford University Press

research-article

The effect of cadmium and lead on the growth of two species of marine phytoplankton with particular reference to the development of tolerance

J.R. Jennings

Department of Zoology and Comparative Physiology, Queen Mary College Mile End Road, London El 4NS

Received on November 1, 1978; accepted on April 1, 1979 Decreases in salinity (<10%) increased the growth rates of Phaeodactylum tricornutum and Dunaliella tertiolecta. Increasing levels of cadmium (1–50 ppm (mg 1–1)) reduced the growth rates of both species. 100 ppm cadmium was lethal to D. tertiolecta but not to P. tricornutum. Lead (1 –4 ppm) initially increased the growth rate of D. tertiolecta but then caused all but the 1 ppm culture to die. Lead (1–4 ppm) caused a decrease in growth rate of P. tricornutum. After exposure to 1 ppm cadmium, cultures of D. tertiolecta showed an increased tolerance to levels of cadmium, and a changed response to levels of lead. Exposure of P. tricornutum to either cadmium or lead, or exposure of D. tertiolecta to lead caused no change in response to either metal.


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