Size of successively laid eggs decreased in the egg clutch of Epirrita autumnata. The laying order of the eggs in autumn had a significant effect on the development of the eggs the following spring; larvae from the first-laid eggs hatched first. First-hatched larvae grew slightly larger than the ones that hatched last. Pupal mass, total number of eggs laid, number of fertile eggs, and proportion of unfertilized eggs did not differ among siblings originating from the different parts of the female's egg clutch. Rearing larvae solitarily or in groups did not differentially affect the performance of indi- viduals originating from successively laid egg groups. Larger, earlier laid eggs of E. autumnata did not perform better than smaller, later laid eggs.
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