Record Display for the EPA National Library Catalog


Main Title Trophic structure modifications by planktivorous fish in aquatic microcosms /
Author Jassby, A., ; Rees, J. ; Dudzik, M. ; Levy, D. ; Lapan., E.
Other Authors
Author Title of a Work
Rees, J.,
Dudzik, M.,
Levy, D.,
Lapan, E.,
Harte, J.,
Jassby, A.
CORP Author California Univ., Berkeley. Lawrence Berkeley Lab. ;Energy Research and Development Administration, Washington, D.C. Div. of Biomedical and Environmental Research.;Environmental Protection Agency, Washington, D.C. Office of Energy, Minerals, and Industry.
Publisher Environmental Protection Agency, Office of Research and Development, Office of Energy, Minerals and Industry,
Year Published 1977
Report Number EPA-600/7-77-096
Stock Number PB-274 342
OCLC Number 03490410
ISBN pbk.
Subjects Aquatic biology
Additional Subjects Food chains ; Fishes ; Plankton ; Fresh water biology ; Ecology ; Zooplankton ; Phytoplankton ; Bacteria ; Nutrients ; Respiration ; Carbon ; Concentration(Composition) ; Organic compounds ; Chlorophylls ; Nitrogen ; Animal behavior ; Acclimatization ; Trophic level ; Microcosms ; Gambusia affinis ; Simocephalus vetulus ; Alona guttata ; Rotifera
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600-7-77-096 c.1 Headquarters Library/Washington,DC 11/13/2012
EKCD  EPA-600/7-77-096 CEMM/GEMMD Library/Gulf Breeze,FL 08/21/2018
ELBD ARCHIVE EPA 600-7-77-096 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ELBD  EPA 600-7-77-096 AWBERC Library/Cincinnati,OH 08/21/2019
ESAD  EPA 600-7-77-096 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-274 342 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18 pages ; 28 cm
Two of 4 replicate 700-liter aquatic microcosms each were stocked with 2 mosquito fish (Gambusia affinis). The dominant zooplankter shifted from the large cladoceran Simocephalus vetulus to the smaller Alona guttata. The subsequent release of grazing pressure resulted in a rise in both phytoplankton and bacteria levels, which in turn were responsible for an increased rotifer biomass. Particulate organic carbon was higher and dissolved inorganic nitrogen was lower in the presence of Gambusia, reflecting a net shift of nutrients from inorganic to organic form, presumably because of smaller zooplankton respiratory losses. Ratios of particulate to dissolved organic carbon and of phytoplankton carbon to chlorophyll a were unnaturally high in the microcosms containing fish. An increase in total nitrogen was deduced for all 4 systems during the experiment; the increase could be explained by the presence of heterocystous Anabaena sp, and was independent of the presence of fish.
"Running head: Microcosm trophic structure." Research supported by the U.S. Energy Research and Development Administration and the Environmental Protection Agency D5-E681 through contract #77BCC. "LBL-5978." Issued Aug. 1977. Includes bibliographical references (pages 14-15).