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Mean (±SEM) surface area of newly fertilized eggs collected in the first experiment from nesting sites with ambient (A) and high (H) CO2 (left panel) and overall mean (±SEM) surface area of eggs regardless of the stage of development in the two periods (early and late May; right panel). In this latter case, eggs belonged to both CO2 nesting sites. ***P = 0.001. n = 88 (A), n = 87 (H), n = 769 (early May) and n = 456 (late May).
