Abstract
The widespread occurrence of pollutants such as polychlorinate@ biphenyls (PCB's) and chlorinated hydrocarbon pesticides has been well documented for a number of marine organisms in the Atlantic Ocean (JENSEN et al. 1969; RISEBROUGH et al. 1968; RISEBROUGH et al. 1972) as well as in the Pacific Ocean off California and Panama (ZITKO 1971). Specifically~ PCB's have been recently identified in marine birds from Antarctica (RISEBROUGH and CARMIGNANI 1972). Opportunity was provided for collecting vertebrates on Ascension Island~ a remote volcanic island in the South Atlantic O , O , Ocean (7 57 S, 14 22 W). On this island pelagic-feeding birds such as the Sooty Tern (Sterna fuscata) nest in huge colonies on the volcanic "fairs" or "plains" (ASHMOLE 1963) and others, such as the Fairy Tern (Gygis alba) and Brown Booby (Sula leucosaster)~ breed commonly on nearby cliffs (DORWARD 1963). Some of these birds were taken in March 1972 for pollutant and pesticide analyses in our Florida laboratories.
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