Contrasting temporal changes in lay-date distributions in co-occurring populations of Blue Tits Cyanistes caeruleus and Great Tits Parus major
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Journal: Bird Study
Capsule Between 1990 and 2004 changes in first-egg date (FED) differed in co-occurring populations of Blue Tits and Great Tits. In Blue Tits mean FED advanced by five days but the within-year variability in FEDs did not change, while in Great Tits mean FED did not change but there was a significant increase in within-year variability. © 2011 British Trust for Ornithology.
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Authors: Goodenough, A.E., Hart, A.G., Stafford, R. and Elliot, S.L.
Journal: BIRD STUDY