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Long-Term Trends in Reproductive Traits of Tits (Parus major, P. caeruleus) and Pied Flycatchers Ficedula hypoleuca

Wolfgang Winkel and Hans Hudde
Journal of Avian Biology
Vol. 28, No. 2 (Jun., 1997), pp. 187-190
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3677313
Stable URL: http://www.jstor.org/stable/3677313
Page Count: 4
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Long-Term Trends in Reproductive Traits of Tits (Parus major, P. caeruleus) and Pied Flycatchers Ficedula hypoleuca
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Abstract

Between 1970 and 1995, Great and Blue Tits in northern Germany started breeding progressively earlier. Also Pied Flycatchers showed a significant trend towards earlier breeding, and in this species clutch size and number of fledged young increased significantly from 1970 to 1995. In all three species the fluctuations in annual mean hatching dates were significantly correlated with the mean average spring temperatures. The recorded time trends in breeding correspond with increasing March and April temperatures from 1970 to 1995.

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