Clutch size showed a trend toward smaller clutches over time for blue tits (−0.021 [−0.026, −0.015] eggs per year) and great tits (−0.017 [−0.022, −0.012] eggs per year), with varying strengths among populations ( σ b year : 0.008 [0.006, 0.012]), but not for pied flycatchers (0.005 [−0.002, 0.011] eggs per year; Appendix S1 : Table S1 and Figure S3 ).
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Temperature synchronizes temporal variation in laying dates across European hole-nesting passerines.
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