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Providing evidence to improve practice

Individual study: Removing deciduous vegetation from regenerating forests decreases forest bird nesting density and success

Published source details

Easton W.E. & Martin K. (2002) Effects of thinning and herbicide treatments on nestsite selection by songbirds in young managed forests. The Auk, 119, 685-694


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

Apply herbicide to mid- and understorey vegetation Bird Conservation

A replicated, randomised, controlled study from 1992-1995 in nine 11-22 year old regenerating coniferous plantations (22-47 ha) in British Columbia, Canada (Easton & Martin 2002), found that bird nesting density and success was lower in areas with manual control of vegetation and herbicide application, compared to control areas (45 nests and 12% success in treatment areas vs. 79 nests and 18% success in controls). Overall, density and success increased with increasing area of deciduous vegetation remnants. Three years after treatment removed 90-96% of deciduous vegetation, experimental areas still had few deciduous trees, compared to controls.

 

Manually control or remove midstorey and ground-level vegetation (including mowing, chaining, cutting etc) in forests Bird Conservation

A replicated, randomised, controlled study from 1992-1995 in nine 11-22 year old regenerating coniferous plantations (22-47 ha) in British Columbia, Canada (Easton & Martin 2002), found that bird nesting density was lower, but success higher, in areas where deciduous trees and saplings were cut, compared to controls (40 nests and 28% success in treatment areas vs. 79 nests and 18% success in controls). Overall, density and success increased with increasing area of deciduous vegetation remnants. Three years after treatment removed 90-96% of deciduous vegetation, experimental areas had similar numbers of deciduous trees to controls. The effect also applying herbicide to the deciduous stumps is discussed in ‘Apply herbicide to mid- and understorey vegetation’.