Abstract
ppm on a wet weight basis, or approximately 38 ppm on a lipid basis. The murres of the Farallons, with a 13 per cent decrease in shell thickness, might be expected to experience lowered reproductive success. A reduction in shell thickness of 13 per cent in eggs of Mallards (Anus phty~hynchos) induced by dietary DDE under controlled experimental conditions was associated with increased numbers of cracked eggs, reduced hatchability of eggs with untracked shells, and increased embryonic mortality (Heath et al. 1969). Studies of the effects of marine pollution upon the Common Murres and other marine avifauna are continuing at the Farallon Island Station of the Point Reyes Bird Observatory. The study was supported by NSF grant GB 11649 to the Institute of Marine Resources, H. S. Olcott, principal investigator. We thank H. S. Olcott, D. W. Anderson, and personnel of the United States Coast Guard and the Point Reyes Bird Observatory for their assistance.
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