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This dissertation work was begun under the guidance of Edward 

 S. Deevey, Jr., my major professor for more than 9 years. Ed's death 

 in November 1988 was a blow to many academic disciplines, and a 

 sad personal loss of which I am especially cognizant at this time. I 

 have benefitted from Frank Nordlie's particulalry competent 

 guidance through the completion of my studies. Claire Schelske 

 generously provided the space, resources and financial support that 

 allowed me to complete my graduate work. Joseph S. Davis and 

 Ronald G. Wolff have been supportive members of my graduate 

 committee for many years. It is largely due to Ron's encouragement 

 that I pursued graduate studies at the University of Florida. No list 

 of acknowledgements for my graduate work would be complete 

 without expressing sincere thanks for all manner of support and 

 encouragement to Mark Brenner, my colleague of 11-1/2 years who 

 introduced me to paleolimnology. 



Ill 



