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Limnology of Canyon Ferry Reservoir
Author(s) -
WRIGHT JOHN C.
Publication year - 1959
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1959.4.3.0235
Subject(s) - photosynthesis , photic zone , phytoplankton , chlorophyll a , chlorophyll , standing crop , seston , deep chlorophyll maximum , botany , biology , biomass (ecology) , ecology , nutrient
In general, one µ g chlorophyll was equivalent to 0.5 mm 3 cell volume and 0.12 mg ash‐free dry weight. The average seston content consisted of 34.5% phytoplankton, 9.8% zooplankton, and 55.7% detritus. Optimal photosynthesis per unit chlorophyll and cell volume averaged 0.39 µ mole O 2 / µ g chl/hr and 0.86 µ mole O 2 /mm 3 /hr, respectively. The average euphotic zone photosynthetic rate was 52% of the optimal rate. Chlorophyll content per unit volume of cells and photosynthesis per unit chlorophyll or cell volume decreased with increase in population size. Evidence was found of an interacting effect of temperature, light intensity, and phosphates on photosynthesis. An empirical method was described for estimating photosynthesis on the basis of chlorophyll content, optimal ra.te of photosynthesis per unit chlorophyll, extinction coefficient, and the ratio of euphotic zone photosynthesis to optimal photosynthesis. Determinations of phytoplankton respiration were made, and net euphotic zone photosynthesis was computed for various sizes of chlorophyll standing crop. It was concluded that the most frequently occurring values of chlorophyll standing crop were most likely to produce a maximum net production and to be at a steady state level.