Ardea
Official journal of the Netherlands Ornithologists' Union

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Yuta T. & Koizumi I. (2012) Long breeding season and high frequency of multiple brooding in Great Tits in northern Japan. ARDEA 100 (2): 197-201
The Great Tit Parus major is one of the most intensively studied birds and has contributed greatly to the current understandings of evolution and ecology of natural populations. However, despite its wide geographic distribution and high variations in the life history traits among regions, most ecological studies are concentrated in Europe, and there are relatively few studies elsewhere. We studied the breeding ecology of a Great Tit population in northern Japan and compared their breeding parameters to those described previously for European populations. This population was characterized by a long breeding season, up to four months from May to as late as the end of August (egg-laying to fledging), and a high frequency of multiple brooding (≥60%) including two occasions of third broods. In addition, for the latitude of the location, the clutch size was large with a mean of over ten, compared to less than eight in European populations at the equivalent latitude. The high productivity of the studied population may be a consequence of the high diversity and abundance of prey items in northern Japan associated with past and present climatic characteristics.


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