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Article
J. J. Sanz, Auteur ; J. M. Tinbergen, Auteur ; M. Orell, Auteur ; S. Rytkonen, AuteurDans Ardea (86(1) 1998)We present data on the natural variation in daily energy expenditure (DEE, measured by the doubly labelled water technique) of individual female Great Tits Parus major tending their brood near the northern border of the species' distribution. We[...]
Article
S. Rytkonen, Auteur ; I. Krams, AuteurGreat tits Parus major have generally much poorer breeding success in northern Finland than in mid- and western Europe. The aim of this study is to find out whether the poor success is linked to foraging behaviour. This was studied by monitoring[...]
Article
L. Kvist, Auteur ; K. Viiri, Auteur ; P. C. Dias, Auteur ; S. Rytkonen, Auteur ; M. Orell, AuteurMitochondrial control region sequences from European populations of the blue tit Parus caeruleus were used to reveal the Pleistocene history and the post-glacial recolonization of Europe by the species. The southern subspecies, P. c. ogliastrae [...]
Article
S. Rytkonen, Auteur ; P. Kuokkanen, Auteur ; M. Hukkanen, Auteur ; K. Huhtala, AuteurPrey selection of the Sparrowhawk (Accipiter nisus) was studied in northern Finland during 1982-1993. A total of 540 prey items tall birds) were recorded from the surroundings of 12 nests. For each prey species a vulnerability index was calculat[...]
