Abstract
Following the disappearance of all Lake Tahoe cladocera in 1970, Daphnia rosea reappeared in the lake during the summer and fall of 1983. Since the introduction and population increase of the omnivorous opossum shrimp, Mysis relicta , was heavily implicated in the initial disappearance, we investigated the D. rosea recurrence with respect to fluctuating M. relicta abundance and steadily increasing primary productivity. An analysis of D. rosea population dynamics, fecundity, feeding characteristics and M. relicta feeding selectivity, suggested that D. rosea was able to coexist with M. relicta in 1983 only because D. rosea birth rates were substantially higher than historical levels due to the increase in algal productivity since 1970. The variation of cladoceran success in lakes of M. relicta introductions may be due, in large part, to variations in primary productivity.
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