Record Display for the EPA National Library Catalog

RECORD NUMBER: 120 OF 292

Main Title Environmental Physiology of Fresh Water Planktonic Crustacea.
Author Armitag, Kenneth B. ;
CORP Author Kansas Water Resources Research Inst., Manhattan.
Year Published 1972
Report Number Contrib-95; DI-14-31-0001-3016; OWRR-A-027-KAN; 06603,; A-027-KAN(1)
Stock Number PB-208 023
Additional Subjects ( Water pollution ; Heat) ; ( Daphnia ; Temperature) ; ( Aquatic animals ; Ecology) ; Metabolism ; Crustacea ; Zooplankton ; Acclimatization ; Reproduction(Biology) ; Growth ; Thermal pollution ; Water pollution effects(Animals)
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NTIS  PB-208 023 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 25p
Abstract
The addition of heated effluents to fresh water environments could affect ecosystem energetics by its effects on metabolism. The poikilothermic planktonic crustaceans presumably have a temperature-dependent metabolism. However, metabolic compensation could markedly modify the metabolism-temperature (M-T) curve and hence, the energy budgets of fresh water ecosystems. Four species of Daphnia were cultured at 10C and 20C. Their metabolism was measured at 10 - 12C and 20 - 22C. D. pulex, D. similis, D. ambigua, and D. galeata mendotae showed some degree of metabolic compensation. Those animals acclimated at 10 - 12C had higher metabolic rates at 10 - 12C than animals acclimated at 20 - 22C. In most instances, metabolism at 20 - 22C was higher in the daphnids acclimated at 10 - 12C. R-T curves were determined for D. ambigua and D. galeata mendotae at five degree intervals from 5C to 30C. The curve of D. ambigua acclimated at 10C clearly was shifted to the left (translation) of the curve for 20C acclimation. D. galeata mendotae showed little acclimation over the temperature range of 10 - 20C. Possibly a combination of rotation and translation occurred. D. galeata mendotae were grown from neonates at 10C and 20C. There was no difference in the size of the animals at which eggs first appeared, but animals at 20C began reproduction several days earlier and produced more young than animals at 10C. There was some evidence that the temperature at which eggs developed influenced subsequent growth and reproduction.