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Providing evidence to improve practice

Individual study: Foraging by bats in cleared, thinned and unharvested boreal forest

Published source details

Patriquin K.J. & Barclay R.M.R. (2003) Foraging by bats in cleared, thinned and unharvested boreal forest. Journal of Applied Ecology, 40, 646-657


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Thin trees within forest and woodland Bat Conservation

A replicated, controlled, site comparison study in 1999–2000 of 36 deciduous, coniferous and mixed forest sites in Alberta, Canada (Patriquin & Barclay 2003) found that thinned tree stands had similar activity for three bat species to unthinned tree stands, but one bat species was recorded less often in thinned stands than in clearcut patches. The activity of little brown bats Myotis lucifugus, northern long-eared bats Myotis septentrionalis and silver haired bats Lasionycteris noctivagans did not differ significantly between thinned and unthinned tree stands in any of the three types of forest (data reported as statistical model results). In all three types of forest, silver-haired bat activity was significantly lower in thinned tree stands than in clearcut patches. Experimental forest patches (10 ha) had four tree density treatments (0% clearcut, 20% and 50% thinned, 100% unthinned) in three types of forest (deciduous, coniferous and mixed, all >50 years old). Three replicates of each treatment in each forest type were surveyed. At each of 36 sites, bat activity was recorded with bat detectors at the centre and edge of each patch in June–July 1999 and June–August 2000 for a total of 11–14 nights.

(Summarised by Anna Berthinussen)