Abstract
Abstract. Natural forests have been progressively replaced by other forest types, mainly monoculture plantations. We compared the abundance of Great Tits and its main food competitors, the Chaffinch Fringilla coelebs and other tits species (Blue Tit Cyanistes caeruleus, Coal Tit Periparus ater and Crested Tit Lophophanes cristatus), and breeding parameters of Great Tits in four forest types: a mixed forest, a native broadleaf forest, a Maritime Pine Pinus pinaster plantation and a Blue Gum Eucalyptus globulus plantation in Central Portugal. The breeding parameters (laying date, clutch size, egg volume, hatching success, fledging success and chick body mass) were collected from nest boxes placed in the four forest types. The censuses indicated a higher abundance index of Great Tit and its food competitors in the mixed and broadleaf forest, when compared to the monoculture plantations. Occupancy rate of nest boxes was not directly related with tit abundance due to differences in the availability of natural ...
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