||Estimation of Phytoplankton Decomposition Rates Using Two-Stage Continuous Flow Studies.
Rodgers, P. W. ;
DePinto, J. ;
||De Paul Univ., Grosse Ile, MI. Large Lakes Research Station.;Environmental Research Lab.-Duluth, MN.
Mathematical models ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
A two-stage continuous flow (TSCF) system was used to quantify phytoplankton decomposition rates and to characterize the decay process as a function of phytoplankton species, phytoplankton physiological state, and the presence and character of a decomposer community. A TSCF system allowed a steady-state phytoplankton culture, grown in the first stage, to be the feed to a darkened second stage decomposition culture. A mass balance on the phytoplankton biomass in the second stage quantitatively assessed the magnitude of the decomposition rate. The results of 12 experimental runs revealed that the relative order of decay rates among three phytoplankton species tested was Microcystis (blue-green) > Asterionella (diatom) > Scenedesmus (green). The results also suggest a strong dependence of decay rates on the presence and origin of the decomposer community in the second stage. A decomposer community originating from a hypereutrophic lake accounted for higher decay rates than did an inoculum from mesotrophic waters of Lake Ontario. (Copyright (c) 1983 Pergamon Press Ltd.)