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Sign up to take part. Great Nature Research Exposed. Seasonal timing of reproduction is an important fitness trait in many plants and animals but the underlying molecular mechanism for this trait is poorly known.

DNA methylation is known to affect timing of reproduction in various organisms and is therefore a potential mechanism also in birds.

Here we describe genome wide data aiming to detect temporal changes in methylation in relation to timing of breeding using artificial selection lines of great tits Parus major tits to contrasting temperature treatments. In total, we obtained tits data from 63 libraries over four different time points from 16 birds with on average 20 million quality filtered reads per library.

These data describe individual level temporal variation in DNA methylation throughout the breeding season under white witch xxx temperature regimes and provides a resource for future studies investigating the role of temporal changes in DNA methylation in timing of reproduction. Machine-accessible metadata file describing the reported data ISA-Tab format.

In seasonally varying environments, timing of reproduction is under strong selection, as individuals need to great the time of reproduction to favorable environmental conditions.