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Documents disponibles écrits par cet auteur (6)
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Article
O. Hogstad, AuteurThe breeding density of a Brambling Fringilla montifringilla population studied during 1966-1998 in a subalpine birch forest area covering 3.5 km(2) in central Norway Varied between two and 52 territories/km(2) with a mean of 28.4. The populatio[...]
Article
O. Hogstad, AuteurThe Fieldfare Turdus pilaris, a medium-sized passerine, is aggressive in nest defence and its use of faeces may be detrimental to avian but not to mammalian predators. The birds breed either solitarily or in colonies, the nesting pattern in suba[...]
Article
O. Hogstad, AuteurAlthough tit Parus species are considered suitable as biomonitors for local contamination, sexual differences in their accumulation of heavy metals have not been studied. Here I present data on the concentration (mg kg(-1) dry weight) of cadmium[...]
Article
O. Hogstad, Auteur ; I. Stenberg, AuteurBody-mass and wing-length of adult White-backed Woodpeckers Dendrocopos leucotos were measured in 57 males and 55 females in Surnadal community in western Norway during November-June from 1985 to 2001. The mean physical condition (ratio body-mas[...]
Article
I. Stenberg, Auteur ; O. Hogstad, AuteurMale white-backed woodpeckers (Dendrocopos leucotos) in a 250-km(2) study area in western Norway are significantly larger than females in bill length and depth, wing and tarsus lengths, and bodyweight. During the winters (October-March 1985-2002[...]
Article
O. Tenow, Auteur ; A. C. Nilssen, Auteur ; H. Bylund, Auteur ; O. Hogstad, Auteur1. In 1990-2003, during a complete 10-year outbreak cycle, the synchrony of the birch defoliating outbreaks of the geometrids Epirrita autumnata and Operophtera brumata was studied quantitatively in the northern part of the Fennoscandian mountai[...]
