Record Display for the EPA National Library Catalog


Main Title Production cycles in aquatic microcosms /
Author Jassby, A. ; Dudzik, M. ; Rees, J. ; Lapan, E. ; Levy., D.
Other Authors
Author Title of a Work
Jassby, A.
CORP Author California Univ., Berkeley. Div. of Energy and Environment.;Environmental Protection Agency, Washington, D.C. Office of Energy, Minerals and Industry.;Energy Research and Development Administration, Washington, D.C. Div. of Biomedical and Environmental Research.
Publisher Energy and Environment Division, Lawrence Berkeley Laboratory, University of California,
Year Published 1977
Report Number EPA-600/7-77-097
Stock Number PB-273 675
OCLC Number 03249030
Subjects Aquatic ecology ; Water--Microbiology ; Aquatic microbiology
Additional Subjects Primary biological productivity ; Nutrients ; Aquatic microbiology ; Fresh water biology ; Nitrogen cycle ; Seasonal variations ; Catfishes ; Snails ; Marine fishes ; Phytoplankton ; Chlorophylls ; Carbon ; Phosphorus cycle ; Zooplankton ; Ocean environments ; Concentration(Composition) ; Food supply ; pH ; Oxygen ; Crustacea ; Physa ; Trophic level ; Gambusia affinis ; Placostomas placostomas ; Predators
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600-7-77-097 Headquarters Library/Washington,DC 03/22/2016
EKCD  EPA-600/7-77-097 CEMM/GEMMD Library/Gulf Breeze,FL 08/21/2018
ELBD ARCHIVE EPA 600-7-77-097 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
EMBD  EPA/600/7-77/097 NRMRL/GWERD Library/Ada,OK 09/29/1995
ERAD  EPA-600/7-77-097 Region 9 Library/San Francisco,CA 04/27/2016
ESAD  EPA 600-7-77-097 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-273 675 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 51 pages.
Four 700-liter cylindrical containers were filled with demineralized water, enriched with nutrients, and inoculated with 3.5-liter lakewater samples. The microcosms were maintained at a temperature of 18C under a 12:12 L:D cycle for 6 months and several manipulations of their trophic structure were carried out, including addition of snails (Physa sp.), mosquitofish (Gambusia affinis), and catfish (Placostomas placostomas). Temporal variation of the phytoplankton resembled the bimodal patterns in certain natural systems. Further analysis demonstrated a close analogy with the predator-prey oscillations of temperate marine waters: an initial bloom is terminated by zooplankton grazing; the resulting low phytoplankton levels lead to gradual starvation of the zooplankton; and a second bloom follows the final dieoff of zooplankton. Both decreasing the concentration of initial nutrients or stocking the microcosms with Gambusia decreases the time between the 'spring' and 'fall' blooms.
"LBL 5965" Prepared U.S. Energy Research and Development Administration under contract no. W-7405-ENG-48. UC-11. Includes bibliographical references (pages 37-39).