engleski

Spring Temperatures in Relation to Laying Dates and Clutch Size of the Blue Tit (Parus caeruleus) in Croatia

This study was based on spring temperatures, laying dates, and clutch size of the first nesting attempt of the Blue Tit (Parus caeruleus) from 1982 to 2004 in Hrvatsko Zagorje rural area, Croatia. The results suggest that timing of breeding of the Blue Tit is influeced by spring air temperatures. There was a significant correlation between spring temperature and years, consistent with a global warming trend. The date of clutch initiation in the Blue Tit population studied did not decrease over a 23-year period. Correlations between sprig temperatures and clutch size, and year and clutch size were not significant.

Blue Tit; Parus caeruleus; spring temperatures; laying dates; clutch size

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