Fragmentation effects on dead wood-dependent species associated with disturbed forest habitats: implications for stump harvesting
Effets de la fragmentation sur les espèces des habitats forestiers perturbés : implications pour la récolte des souches
Ranius, T. ; Mestre, L. ; Bouget, C. ; Schroeder, M.
Type de document
Article de revue scientifique à comité de lecture
Affiliation de l'auteur
SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES UPPSALA SWE ; SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES UPPSALA SWE ; IRSTEA NOGENT SUR VERNISSON UR EFNO FRA ; SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES UPPSALA SWE
Résumé / Abstract
Stump harvesting after clear-felling may be detrimental for species’ landscape-scale persistence. Sensitivity to it is most likely due to reductions in habitat density, resulting in a non-linear relationship between population size and total habitat amount (i.e. fragmentation effects). Here we summarize theoretical expectations and empirical findings on fragmentation effects in stumps and other types of dead wood in disturbed forest habitats and draw conclusions about the consequences of stump harvesting. Within disturbed patches, some negative fragmentation effects have been observed for beetles and lichens, but most studies have found a linear relationship between habitat amount and population size. At landscape scale, evidence of fragmentation effects in disturbed forest habitats has been detected in some published investigations, but none of them focused on stumps. Thus, although organisms associated with disturbed forest habitats are assumed to be strong dispersers, they may still be sensitive to habitat fragmentation. We conclude that stump harvesting at a moderate level is not likely to increase risks for landscape-scale species extinctions markedly, despite clearly negative local effects. However, due to large uncertainties, adaptive management with monitoring of dead wood-dependent species should be applied wherever stump harvesting is more extensive.
Scandinavian Journal of Forest Research, vol. 32, num. 3, p. 260 - 267