482 JENNISON 



before those in natural populations. Females in the outfall begin 

 gametogenesis at the same time as control animals but spawn earlier. 



Control females transplanted to the outfall in November 1975 

 underwent accelerated vitellogenesis and spawned by the end of 

 March 1976, 4 to 5 months ahead of either unmanipulated control or 

 acclimated outfall anemones. 



Control anemones spawn during the period of peak summer 

 temperatures, which may reach 15°C. Outfall anemones spawn after 

 temperatures in the thermal canal reach 25° C. It is suggested that 

 outfall anemones have become acclimated to the warmer water 

 (which is regularly 10°C higher in temperature than that in the 

 control area) and are responding at 25° C to the same temperature 

 cues that influence spawning in control populations at 15° C. 



ACKNOWLEDGMEIMTS 



This paper is part of a thesis submitted for the Ph.D. degree in 

 zoology at the University of California, Berkeley. I thank my major 

 advisor, Cadet Hand, and the members of my committee. The 

 cooperation and assistance of the Pacific Gas and Electric Company 

 are gratefully acknowledged. This work was performed while I was 

 supported by a traineeship associated with Project #R/E-10, Grant 

 #04-6-158-44021, awarded to Cadet Hand and Ralph I. Smith by the 

 University of California Sea Grant College Program, National Oceanic 

 and Atmospheric Administration, U. S. Department of Commerce. 

 The Harbor Branch Foundation, Inc., provided support during 

 manuscript preparation. This is contribution number 91, Harbor 

 Branch Foundation, Inc. 



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