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227 109 109 3 3 A. Metaxas A. G. Lewis Department of Oceanography University of British Columbia 6270 University Boulevard V6T 1W5 Vancouver British Columbia Canada Department of Biology Dalhousie University B3H 4J1 Halifax Nova Scotia Canada Abstract The purpose of this study was to examine the effect of the interaction of two species of marine diatoms, Skeletonema costatum (Cleve) Greville and Nitzschia thermalis (Ehrenberg) Auerswald, on their individual copper tolerances. The two species, obtained from stock cultures in 1989, were grown together at three copper concentrations (1, 4 and 5 × 10 −7 M added total copper). In the unialgal cultures that were used as controls, the two species grew as predicted from their tolerance tests. However, in mixed cultures, N. thermalis was the only species that exhibited growth, regardless of the copper concentration in the medium. Growth retardation of S. costatum in the presence of N. thermalis was attributed to an inhibitory exudate. The effect of the exudate appeared to have been temporary, as demonstrated by the extended lag phase and subsequent satisfactory exponential growth rate of S. costatum. It is suggested that the exudate degraded within a period of 5 d (=lag phase) because exponential growth rate was resumed. It thus appears that the interaction between the two diatom species is more important in determining the survival of S. costatum than its individual copper tolerance. This is not the case for N. thermalis. Such interactions would be unaccounted for in single-species toxicity tests. On the other hand, if they are known, prediction of how a community that includes these two species would respond to copper additions becomes possible.
Marine Biology – Springer Journals
Published: Oct 1, 1991
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