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PHYSICOCHEMICAL FACTORS AND THEIR EFFECTS ON ALGAL GROWTH IN A NEW SOUTHERN CALIFORNIA RESERVOIR 1
Author(s) -
Elder John F.,
Fuller Richard H.,
Home Alexander J.
Publication year - 1979
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1979.tb01174.x
Subject(s) - hypolimnion , nutrient , environmental science , phytoplankton , phosphorus , thermocline , algae , algal bloom , epilimnion , diel vertical migration , population , oceanography , nitrogen , biomass (ecology) , redfield ratio , eutrophication , ecology , geology , chemistry , biology , demography , organic chemistry , sociology
Some physical and chemical characteristics of Lake Perris, a new southern California reservoir, were investigated with regard to their influence on phytoplankton biomass and community structure. The concentration of three major nutrients – nitrogen, phosphorus, and iron – was approximately equivalent to the demand ratio of fresh water plants. Large increases in iron and phosphorus concentrations in late summer due to releases from sediments, however, tended to shift the balance toward a nitrogen‐limited situation. Nitrogen limitation favored nitrogen‐fixing blue‐green algae, and after a decline of competing algae during the summer, the blue‐green population bloomed in September. Series of measurements taken over one‐day periods during summer stratification showed that some iron, phosphorus, and manganese from the hypolimnion could move upward, corresponding to diel shifts in the thermocline depth. Vertical transport of nutrients could thus occur long before complete lake mixing and could support summer/fall algal blooms.