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- Title
Effects of rotifers and ciliates on the growth and survival of Daphnia.
- Authors
Wickham, Stephen A.; Gilbert, John J.; Berninger, Ulrike-G.
- Abstract
can suppress ciliates and rotifers through predation and interference competition, but it is not known whether this produces any direct benefit to . We conducted survivorship and cohort lifetable experiments to determine whether can utilize ciliates and rotifers as food. Three species of oligotrich ciliates ( and ) and one rotifer () were used. Lifetable experiments were conducted with a basal level of algae ( sp.), plus either ciliates or rotifers, while survivorship experiments had only the rotifers or ciliates. Densities of 30 ml, 50 ml and 15 S. ml enhanced 's population growth rate 35–50% over controls with only algae. Ten ml did not produce a significant change in growth rate. Densities of 100 and 300 increased population growth rates by II and 10%, respectively. Both 10 and 50 ml enhanced 's survivorship compared to starved controls, but neither 100 nor 300 l enhanced its survivorship. The amount of enhancement of growth rates by rotifers and ciliates is roughly proportional to the death rates imposed by . The death rate imposed by on rotifers is a function of both algal density and size. Per unit biomass, neither ciliates nor appear to be as nutritious for as is .
- Publication
Journal of Plankton Research, 1993, Vol 15, Issue 3, p317
- ISSN
0142-7873
- Publication type
Article