Hoppenheit, M. (1978). On the dynamics of exploited populations of Tisbe holothuriae (Copepoda, Harpacticoida). VI. Response to perturbation by temporary elevated mortality. Helgoländer Wissenschaftliche Meeresuntersuchungen. 31(3):285-297, figs. 1-10. (viii-1978).

93101

Hoppenheit, M.

1978

31(3):285-297, figs. 1-10. (viii-1978)

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A total of 75 weekly exploited populations of the harpacticoid copepod Tisbe holothuriae Humes were exposed to 0.06, 0.3, 1.5, 7.5 or 37.5 #g Cd§ combined with exploitation rates of 10, 30, 50, 70 or 90 ~ under conditions of surplus food supply at 22 ~ C and 30 %0 S. An unusually high mortality was observed for some weeks which could not be ascribed to the added amounts of Cd §247A change in properties of supplied water is considered responsible for the unintentional perturbation whidl offered a further opportunity to study the effect of compensating reactions in stress situations. The results obtained clearly indicate an effect of exploitation rate on responses to detrimental influences. A superior performance has been found in populations exploited at higher rates. The findings are discussed with respect to earlier investigations on the population dynamics of T. holothuriae.

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