Figure 5. Comparison of Δ (delta) egg temperatures among Cassin's auklets, western gulls, and Laysan albatrosses during the day and night.

Delta temperatures represent the difference between the maximum and minimum egg temperature of each day and subsequent night cycle. Shown are the mean ± SE for each species where N = 19, 11, and 14 individual deployments of each species (respectively) during the day and N = 19, 15, and 16 individual deployments of each species (respectively) during the night. Statistical differences (P<0.05) were designated by symbols a & b. During the day, Δ temperatures of albatrosses were significantly lower than auklets and gulls (a) whereas during the night, both gulls and albatrosses had significantly lower Δ temperatures than auklets (b). See Table 3 for specific temperatures and Figure 6 for temperature cycling.