A consistent long-lasting pattern of spatial variation in egg size and shape in blue tits (<i>Cyanistes caeruleus</i>).

The latter is also the case in our present study, where we found a decreasing trend in egg volumes instead of an increasing trend that would be expected from earlier arguments [ 44 ].

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While the effect of site remained highly significant, a significant negative effect of years was also revealed, with the clutch size covariate being non-significant (Table 1 ).

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