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- W2520662016 abstract "The effects of forest thinning and fragmentation on bird species were studied in northern Finland in 1982-1985. Based on line transect censuses bird communities of vir gin and thinned pine forests, and contiguous and fragmented spruce forests were com pared. There were no statistically significant differences in total bird densities in virgin and thinned pine forests, nor in uniform and fragmented spruce forests. The structure of bird communities was, however, different both in pine and spruce forests. The densities of the generalist species Phylloscopus trochilus, Carduelis flammea and Twdus iliacus and the marsh-nesting Motacilla flava were higher, and those of Parus cinctus, Perisoreus infaustus and Phoenicurus phoenicurus were lower in thinned forests than in virgin pine forests. Forest fragmentation had a positive effect on the densities of Ph. trochilus, T. iliacus and C. flammea, and a negative effect on the group of northern taiga species (Tetrao urogallus, Picoides tridactylus, Parus cinctus, Perisoreus infaustus, Pinicola enucleator and Emberiza rustica). Line transect censuses had been carried out in the vicinity of the study area already in the 1940s and 1950s. Densities of the most common species in virgin forests were com pared using the 1940-50 censuses and the present results. Fringilla montifringilla had in creased fivefold from the 1940-50 period to the 1980s, but this was probably due to a collapse, caused by several cold winters, in the 1940s. Densities of species preferring old forests, such as P. cinctus, Ph. phoenicurus and P. infaustus, had remained nearly the same in the study area from the 1940-50s to the 1980s, although these species have drastically declined in the whole of northern Finland due to silvicultural practices. In my study area the densities probably remained almost unchanged as, even today, there are large, virgin forests left. The importance of these forests in the conservation of declining northern bird species is emphasized." @default.
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- W2520662016 title "Effects of forest management on birds breeding in northern Finland" @default.
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