Record Display for the EPA National Library Catalog


Main Title Basic Research in the Aquatic Environment: Effects of Eutrophication on Phytoplankton Populations and Selected Species of Aquatic Vascular Plants.
Author Mulliga, Hugh F. ;
CORP Author Cornell Univ., Ithaca, N.Y. Water Resources and Marine Sciences Center.
Year Published 1973
Report Number DI-14-01-0001-1533; OWRR-B-011-NY; 06835,; B-011-NY(1)
Stock Number PB-231 358
Additional Subjects Water pollution control ; Weed control ; Aquatic weeds ; Phytoplankton ; Biological productivity ; Water chemistry ; Nitrogen ; Phophorus inorganic acids ; Ponds ; Fertilizers ; Vegetation ; Nitrogen cycle ; Eutrophication ; Nitrogen enrichment
Library Call Number Additional Info Location Last
NTIS  PB-231 358 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 50p
Changes in nutrient concentration are reflected in changes in plant populations. Planktonic algae and benthic plants are in direct competition. An increase in one componenet usually is accompanied by a decline in the population of the other. Continuous fertilization with N and P above the level of .05 mg N/l and .005 mg P/l leads to a dominance in the summer phytoplankton population. A cessation of enrichment causes the plant population to return to natural levels. The concentrations of P-PO4 remain high and it appears that nitrogen is the more limiting of the two elements under natural conditions. Prolonging the cover of the ice has the same consequence as adding additional nitrogen to the water. Although aquatic environments can recover rapidly from enrichment and re-establish near normal vegetation conditions, they are liable to be easily disturbed by unusual natural occurrences such as prolonged ice cover due to exceptionally cold winters.