Environmental predictors of habitat use patterns of Pacific harbor seals (Phoca vitulina richardii) in an urbanized estuary By EMMA KATHRYN GRIGG B.A. (McGill University, Montreal) 1988 M.A. (San Francisco State University, San Francisco) 1999 DISSERTATION Submitted in partial satisfaction of the requirements for the degree of DOCTOR OF PHILOSOPHY in Ecology in the OFFICE OF GRADUATE STUDIES of the UNIVERSITY OF CALIFORNIA DAVIS Approved: Committee in Charge 2008 -i-