Main Title |
Production cycles in aquatic microcosms / |
Author |
Jassby, A. ;
Dudzik, M. ;
Rees, J. ;
Lapan, E. ;
Levy., D.
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Other Authors |
|
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
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Internet Access |
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
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. |
Abstract |
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. |
Notes |
"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). |