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J. Confer, T. Kaaret, G. Likens (1983)
Zooplankton Diversity and Biomass in Recently Acidified LakesCanadian Journal of Fisheries and Aquatic Sciences, 40
G. Fryer (1980)
Acidity and species diversity in freshwater crustacean faunasFreshwater Biology, 10
S. Parent, R. Cheetham (1980)
Effects of acid precipitation onDaphnia magnaBulletin of Environmental Contamination and Toxicology, 25
PURIFICATION OF CYCLOPS CULTURES BY PH SHOCK (COPEPODA) BY LORETTA BULKOWSKI, WILLIAM F. KRISE and KEITH A. KRAUS U.S. Fish and Wildlife Service, National Fishery Research and Development Laboratory, R.D. #4, Box 63, Wellsboro, Pennsylvania 16901, U.S.A. INTRODUCTION Cyclops and Daphnia frequently inhabit the same bodies of water and are ex- cellent foods for zooplanktivorous fish. Intensive rearing of Cyclops for research or as a forage species requires the removal of Daphnia to alleviate interspecific competition. Mechanical separation is not completely successful because the screens that are commonly used allow small Daphnia to pass with Cyclops. The objective of this work was to develop a physiological separation technique bas- ed on relative survival of both Daphnia and Cyclops in solutions adjusted to various pH's. Daphnia has repeatedly been shown to be sensitive to low pH. Acid toxicity tests on Daphnia demonstrated that a several-day exposure to pH 4.5 was lethal (Allen, 1980); the organism reportedly does not occur in lakes with a pH below 5 (Confer et al., 1983), and reproduction is unlikely below pH 5.5 (Parent & Cheetham, 1980); among Daphnia exposed to pH 3. 7, 33 % died in 1 hour and 80% in 3 hours
Crustaceana – Brill
Published: Jan 1, 1985
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