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THE EFFECT OF CURRENT ON PERIPHYTIC PRODUCTIVITY AS DETERMINED USING CARBON‐14 1
Author(s) -
Rodgers John H.,
Harvey R. S.
Publication year - 1976
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.1752-1688.1976.tb00247.x
Subject(s) - productivity , periphyton , biomass (ecology) , phytoplankton , environmental science , streams , chlorophyll a , current (fluid) , carbon fibers , photosynthesis , river ecosystem , hydrology (agriculture) , environmental chemistry , primary productivity , ecology , environmental engineering , chemistry , biology , nutrient , botany , oceanography , ecosystem , mathematics , geology , computer network , macroeconomics , geotechnical engineering , algorithm , computer science , composite number , economics
Productivity measurements of organisms attached to artificial substrates ranged from 6.5–7.6 mg C/m 2 /hr and were 17‐65% greater in stirred bottles (simulated flow) than under static conditions. Carbon‐14 was used to determine the effect of current on the primary productivity of these organisms in six artificial streams at the Flowing Streams Laboratory on the Savannah River Plant (U.S. Energy Research and Development Administration, Aiken, South Carolina, U.SA.). Seasonal changes in dominant organisms were monitored from June 1973 to March 1974. Estimates of productivity, accumulated biomass, and levels of chlorophyll a were compared for possible correlation. Production of chlorophyll a ranged from 50 to 381 mg/m 2 , and accumulated biomass ranged from 45 to 181 g/m 2 on the artificial substrates (glass microscope slides) during the period of study. Productivity of attached organisms was generally an order of magnitude greater than productivity of phytoplankton or tychoplankton. The consistently higher productivity in simulated flowing systems than in static systems tends to cast some doubt on values obtained when lotic communities have been enclosed or isolated in chambers or bottles without inducing a current or stirring action.