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Figure 2. Survival 6 days after treatment and hatching success of mallard embryos treated (on 

 the 8th day of incubation) with petroleum hydrocarbons (A and B, No. 2 fuel oil; C and D, 

 Prudhoe Bay crude). Note: Treatments or weeks that do not have a letter in common were sig- 

 nificantly different at a<0.05, using Tukey's multiple comparison procedure. Differences be- 

 tween controls and 5 nl of fresh oil (weathered weeks) were significant at a<0.05, using a 

 binomial test. Sample size is 47 for all groups except the controls, where «=94 (Szaro et al. 

 1979). 



