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Biodiversity and its Assessment in Boreal and Nemoral Forests

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Abstract:

We review species richness in major organism groups, mainly using examples from northern Europe. A high proportion of these species is forest living, and large numbers are dependent on decaying wood. Biodiversity can be assessed at various scales using two different principles. One is to use features, such as ancient and dead trees, known to be important for a large number of species. The other method is to choose species or groups of species known to indicate high biodiversity or presence of many red-listed species. We argue that any serious biodiversity assessment method should include the most species rich organism groups, for example insects. In the present paper we point out the most important features for high biodiversity (old trees and large dead trees), and review the quantities of these features in near-virgin forests. The natural disturbance regime of a region should be the basis for defining a suitable scale and the appropriate features for biodiversity assessment. Possible indicator species for high biodiversity in northern Europe are suggested, based on previous investigations. Among epiphytic lichens and wood-living beetles there are many potentially useful species in addition to vascular plants in the nemoral forest. Among vertebrates, woodpeckers and grouses seem to be the most useful. Validation tests for indicator structures and species are largely lacking but urgently needed. The implications of possible delayed local extinctions are important to bear in mind when managing for sustainable forestry. The knowledge of forest history is useful when developing cost-efficient measures.

Keywords: ANCIENT; BEETLES; DEAD; DISTURBANCE; EPIPHYTIC; FIRE; FOREST; INDICATOR; LICHENS; RED-LISTED; REGIME; RICHNESS; SPECIES; STRUCTURE; TREES

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/028275801300090546

Affiliations: 1: Department of Ecology, University of Lund, Ecology Building, SE-223 62 Lund, Sweden 2: Department of Ecology, University of Lund, Ecology Building, SE-223 62 Lund, Sweden, 3: Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre, P.O. Box 49, SE-230 53 Alnarp, Sweden

Publication date: March 15, 2001

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