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Providing evidence to improve practice

Individual study: Bird response to 'wildlife-forestry' treatments in bottomland hardwood forests on Tensas River National Wildlife Refuge, Louisiana, USA

Published source details

Twedt D.J. & Somershoe S.G. (2009) Bird response to prescribed silvicultural treatments in bottomland hardwood forests. The Journal of Wildlife Management, 73, 1140-1150

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

Use variable retention management during forestry operations Bird Conservation

A replicated, controlled study in the summers of 2003-2004 in bottomland hardwood forest on Tensas River National Wildlife Refuge, Louisiana, USA (Twedt & Somershoe 2009), found that densities of nine species of birds (six of conservation concern) were higher in stands under variable-retention timber harvests, compared to control (untreated) stands. Densities of five species were greater in untreated stands. Conservation concern scores and detection rates of 30 species, suggest that the mosaic of treated stands afforded greater community-wide bird conservation value than untreated stands. Bird densities were estimated (distance sampling) within forest subject to variable-retention harvests within a 13-year chronosequence (i.e. a set of forested sites with similar attributes but of different ages), and untreated stands.