Premium
The Limnology of Canyon Ferry Reservoir
Author(s) -
WRIGHT JOHN C.
Publication year - 1958
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.1958.3.2.0150
Subject(s) - zooplankton , phytoplankton , photic zone , standing crop , environmental science , grazing , primary production , canyon , zoology , oceanography , nutrient , biomass (ecology) , ecology , biology , ecosystem , geology , geomorphology
Phytoplankton and zooplankton standing crop, gross and net primary production were measured. From these data the daily rate of loss of phytoplankton from the euphotic zone was calculated. The phytoplankton loss correlated well with zooplankton during September and with vertical water movement during October. A grazing coefficient was calculated ( G = 1.064 L water/mg dry wt. zooplankton/day). By use of this coefficient the loss of phytoplankton by zooplankton grazing was calculated for the period of study and averaged 0.255 mg glucose/L/day. Zooplankton assimilation averaged 0.216 mg glucose/L/day, indicating a digestive efficiency of 85%. Gross and net primary production from September 6 to October 17 amounted to 137.2 and 114.0 g glucose/m 2 , respectively. Zooplankton assimilation was estimated to be 85% of net primary production. The ratio of zooplankton net production to zooplankton assimilation was 10.5%.