Birds of Indian Subcontinent

Insulation of Nests and the Northern Limits of Three Phylloscopus Warblers in Finland

Publication Type:Journal Article
Year of Publication:1983
Authors:Tiainen, J, Hanski, IK, Mehtälä, J
Journal:Ornis Scandinavica
Date Published:1983
ISBN Number:00305693
Keywords:Finland, Phylloscopidae, Phylloscopus, Phylloscopus collybita, Phylloscopus sibilatrix, Phylloscopus trochilus, Sibilatrix, Sibilatrix sibilatrix, Trochilus
Abstract:The nests of the Wood Warbler Phylloscopus sibilatrix are not as insulative as those of the Willow Warbler Ph. trochilus and the Chiffchaff Ph. collybita. The northern limit of the distribution of the Wood Warbler has expanded towards the north in this century, but is still some hundred kilometres further south than those of the Willow Warbler and Chiffchaff. The change of the range of the Wood Warbler correlates well with the change of the 13°C June isotherm describing the amelioration of climate in this century. Simultaneous population changes of the Willow Warbler can be explained by habitat changes. The Chiffchaff population has not changed markedly. Differences in the insulation of nests may serve as a contributing causal explanation for these interspecific differences in regional population dynamics.
Short Title:Ornis Scandinavica
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