Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Degradation of the Peritrophic Membrane of Fresh-Water Zooplankton Fecal Pellets.
Author Bathelt, R. W. ; Schelske, C. L. ;
CORP Author Michigan Univ., Ann Arbor. Great Lakes Research Div.;Environmental Research Lab.-Duluth, MN.
Year Published 1983
Report Number EPA-R-806294; EPA-600/J-83-118;
Stock Number PB84-128107
Additional Subjects Zooplankton ; Feces ; Water pollution ; Lake Michigan ; Membranes ; Degradation ; Examination ; Bacteria ; Bioassay ; Sampling ; Chemical analysis ; pH ; Chlorophylls ; Inorganic nitrates ; Ammonia ; Chlorides ; Tables(Data) ; Water pollution detection ; Path of pollutants
Library Call Number Additional Info Location Last
NTIS  PB84-128107 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 15p
Fecal pellets produced by Lake Michigan and Douglas Lake zooplankton in laboratory experiments were settled gently onto microscope slides in specially designed settling chambers. Permanent slides of settled pellets were made in triplicate 24, 48, 72, 96, 120, and 144 hours after removal of zooplankton. Light microscopic examination of the fecal material revealed variations in the amount of pellet degradation within each time interval as well as between successive time intervals. Degradation of the peritrophic membrane of fecal pellets from Douglas Lake zooplankton occurred more rapidly than those from Lake Michigan zooplankton. Degradation of the peritrophic membrane was not accompanied by significant changes in bacteria or chemical conditions in water surrounding the pellets. Results of degradation and sinking rate experiments showed that fecal pellets produced in the upper water column could be transported intact to the sediments of the deepest parts of Lake Michigan. (Copyright (c) 1983, by the American Microscopical Society, Inc.)