laboratory and at the CEPEX installations in Saanich Inlet. 

 British Columbia, Canada. Kinetic uptake patterns obtained by 

 this technique permit an assessment of appropriate parameters 

 that uniquely and sensitively describe organic carbon assimila- 

 tion in a variety of experimentally defined situations. 



Studies completed the past summer at Saanich Inlet were 

 to determine the effects of copper on the local marine com- 

 munity. Present indications are that copper concentrations 

 within the range 10 to 50 ppb cause a dramatic increase in 

 heterotrophic activity during the initial 3 to 4 days of a 20 day 

 experiment. Plate counts indicative of total heterotrophic bio- 

 mass also show a corresponding increase in bacterial numbers. 

 Such stimulation appears to reflect the appearance of increased 

 amounts of labile organic material caused by the toxic effect of 

 copper on the autotrophic component of the marine community. 

 Actually the enhanced heterotrophic response is accomplished 

 by the ascendency of selected bacterial species that have an 

 increased tolerance for copper. Ancillary data on phytoplankton 

 behavior indicate that either death or lysis of primary auto- 

 trophs is the important source of the necessary organic material, 

 and that the organic substrates involved are typical of those 

 excreted in dissolved form by a stressed phytoplankton popu- 

 lation. In this sequence, heterotrophic bacteria provide a useful 

 function by ensuring a rapid mineralization of stress-derived 

 organic excretions, whose end products provide an abundant 

 source of inorganic nutrients for the development of a secon- 

 dary phytoplankton regime less susceptible to copper stress. 



NODC Accession No.: 75-0529 

 Organization: University of Georgia 



Skidaway Institute of Oceanography 

 Investigator: M. Takashashi for CEPEX participants 

 Project title: Controlled Ecosystem Pollution Experiment 



(CEPEX) 



The following summary identifies items submitted to 

 NOAA Environmental Data Service's National Oceanographic 

 Data Center. 



Report: CEPEX Progress Report, May 1, 1973 to May 1. 

 1 974 — Addendum. 



Field Assessment Data — Saanich Inlet: 



1 ) Table of depth, temperature, salinity, NO., NO2, POj, and 

 SiO,. 



2) Tables of chlorophyll-a concentration. 



3) Tables of concentration of phaeopigments. 



Pollutant Transfer and Biological Effects 

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 hydrocarbons from oil by the bivalves Rangia cimeata and 

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 Inputs, Fates, and Effects of Petroleum in the Marine En- 

 vironment, Ocean Affairs Board of the National Academy 

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Anderson, J. W., J. M. Neff, B. A. Cox, H. E. Tatem, and 

 G. M. Hightower, 1973: The effects of oil on estuarine 

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 Symposium: Effects of Pollutants on the Physiological 

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Anderson, J. W., J. M. Neff, B. A. Cox, H. E. Tatem, and 

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