EFFECTS OF THERMAL EFFLUENT 567 



simulated. It is particularly important to note that the more severe 

 temperature conditions measured in the field for the station 2 

 simulation experiment influenced only a very small section of the 

 shoreline immediately adjacent to the point of discharge. 



Although all the benthic invertebrates considered in the study are 

 relatively slow-moving forms, it is extremely difficult to mark, 

 follow, and measure individuals for extended periods in the field. 

 Long-term simulation experiments provide a convenient, alternate 

 means of obtaining detailed data on survival, growth, and condition 

 for such motile invertebrates. The fact that such species do move 

 slowly suggests they may be vulnerable to changes in temperature 

 and other characteristics of the effluent as the structure of the 

 thermal plume changes. 



ACKNOWLEDGMEWTS 



The research reported here was supported by research contracts 

 to the San Diego State University Foundation. We thank David B. 

 Innis, Stephen V. Orr, David C. Sommerville, Frederic L. Steinert, 

 and William R. Weber, who provided technical assistance. We also 

 thank Jon C. Van 01st of San Diego State University for reviewing 

 the manuscript. 



Contribution No. 32 from the San Diego State University Center 

 for Marine Studies. 



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