Predation rates of zooplankton in arctic ponds1

Heterotrophy in corals: zooplankton predation by the hydrocoral Millepora complanata

Heterotrophy is examined in the hydrocoral Millepora complanata Lamarck and compared with scleractinian corals. Natural zooplankton catch rates and digestion rates were determined from counts of prey items captured by the gastrozooids on surfaces of millepore colonies collected in the field. The mean catch rate or feeding rate (+ SD) was 7.1 ? 4.10 prey items cm-2 surface d' and complete digest...

Water mite predation on zooplankton of a tropical lake.

Water mite (Krendowskia sp.) predation on zooplanktonic species from Lake Monte Alegre (São Paulo State, Brazil) was tested in laboratory experiments. One cladoceran, Daphnia gessneri, two copepods, Tropocyclops prasinus and Thermocyclops decipiens, and Chaoborus larvae III and IV were supplied as prey to adult mites. The cladoceran Ceriodaphnia cornuta was used in the experiment with mite nymp...

Predation, Competition, and Zooplankton Community Structure: An Experimental Study

An experimental investigation of the zooplankton community of a small Minnesota pond was conducted for 2 years to determine the mechanisms maintaining its structure and to show that it is predictably organized. A mechanistic interpretation of the strncture o f this community cannot be made solely on the basis of predation, but also requires evaluation o f the relative competitive abilities of t...

Diel vertical migration of Arctic zooplankton during the polar night

High-latitude environments show extreme seasonal variation in physical and biological variables. The classic paradigm of Arctic marine ecosystems holds that most biological processes slow down or cease during the polar night. One key process that is generally assumed to cease during winter is diel vertical migration (DVM) of zooplankton. DVM constitutes the largest synchronized movement of biom...

Diel vertical migration of Arctic zooplankton during the polar