Thayer, et al . , 1975). While any of these human perturbations may be 

 locally important, declining water quality has often resulted in the 

 largest areal losses of eelgrass and other seagrasses (Cambridge, 1979; 

 Cambridge and McComb, 1984; Lee and Olsen, 1985; Orth and Moore, 1983b; 

 Nienhuis, 1983). 



