http://cfs.nrcan.gc.ca/authors/read/14129?lang=en_CA Publications by J. Niemelä en-ca 2001-11-30 00:00:00 MST 2001-11-30 00:00:00 MST webmaster@nofc.cfs.nrcan.gc.ca http://cfs.nrcan.gc.ca/publications?id=18933 Fri, 30 Nov 2001 http://cfs.nrcan.gc.ca/publications?id=18933 http://cfs.nrcan.gc.ca/publications?id=20406 Wed, 31 Jul 2002 http://cfs.nrcan.gc.ca/publications?id=20406 http://cfs.nrcan.gc.ca/publications?id=19091 Thu, 13 Dec 2001 http://cfs.nrcan.gc.ca/publications?id=19091 http://cfs.nrcan.gc.ca/publications?id=20403 The effects of clear-cutting on assemblages of carabids were studied in boreal forest in Alberta and Finland by comparing pitfall samples from young, regenerating forests and natural, primary forests. More than half (15) of the 26 genera, but only 4 of the 108 species, were shared between the 2 continents. On both continents, carabid abundance was greatest in the youngest regenerating sites (1-10 years since cutting) and in certain types of primary forest. Species richness and diversity were higher in regenerating sites than in primary forest on both continents. Three types of numerical responses of species to logging were distinguished: species of open habitat appeared and/or increased in abundance; forests generalists were not dramatically affected and occurred in all or most forest types; and primary forest specialists disappeared after forest cutting. Most species in each of the 3 groups were taxonomically closely related on the 2 continents. It is suggested that biotic diversity can be maintained throughout the boreal forest by a general management approach that maximizes habitat diversity on a regional scale. However, knowledge of local conditions and fauna will be essential to conserve specific assemblages of litter-dwelling invertebrates. Wed, 31 Jul 2002 http://cfs.nrcan.gc.ca/publications?id=20403 http://cfs.nrcan.gc.ca/publications?id=11296 We compared pitfall catches from four types of mature lodgepole pine—white spruce forest with those from five age classes of young forest regenerating subsequent to clear-cutting. Ground beetles were most abundant in the youngest sites (1–2 years since cutting) and in the mature stands on moist soil. Species richness was higher in regenerating sites than in mature forest. Cluster analysis grouped the ground-beetle fauna according to forest age and forest type, suggesting that there is a general pattern of recovery after logging. Responses of common species to forest cutting fell into three groups: (1) forest generalists (2 species) were not dramatically affected, (2) species of open habitat (27 species) appeared and/or increased in abundance, and (3) mature forest species (10 species) disappeared or decreased in abundance. Populations of many mature forest species appear to recover following logging, but several specialists did not recolonize even the oldest regenerating stands. Furthermore, fragmentation and creation of large areas of relatively homogeneous young forest stages through logging may have detrimental long-term effects even on the more abundant forest generalists. We must better understand subtle variations in habitat in order to maintain invertebrate diversity while harvesting the boreal forest. Tue, 22 Aug 2000 http://cfs.nrcan.gc.ca/publications?id=11296