Study

Managed forests in the western Cascades: the effects of seral stage on bat habitat use patterns

  • Published source details Erickson J.L. & West S.D. (1996) Managed forests in the western Cascades: the effects of seral stage on bat habitat use patterns. Pages 215-227 in: R.M.R. Barclay & R.M. Brigham (eds.) Bats and Forests Symposium. British Columbia Ministry of Forests, Victoria.

Actions

This study is summarised as evidence for the following.

Action Category

Thin trees within forest and woodland

Action Link
Bat Conservation
  1. Thin trees within forest and woodland

    A replicated, site comparison study in 1993–1994 of 24 forest sites in the Cascade mountains, USA (Erickson & West 1996) found that thinned tree stands of two different ages had higher bat activity than young unthinned tree stands, but lower bat activity than clearcut stands. A greater number of bat passes were recorded in 10–13-year-old thinned stands (average 2 bat passes/night) and mature thinned stands (4 bat passes/night) than in young unthinned stands (no bat passes). However, fewer bat passes were recorded in both thinned stands than in clearcut stands (8 bat passes/night). At least five bat species were recorded (see original paper for data for individual species). Six replicates of tree stands in four post-harvest stages were sampled: thinned stands (10–13 year old Douglas fir Pseudotsuga menziesii), mature thinned stands (51–62 year old Douglas fir or western hemlock Tsuga heterophylla), young unthinned stands (30–40 years old, high tree density with varied tree diameter), clearcut stands (2–3 years post-harvest, 1–2 m high Douglas fir seedlings). At each of 24 sites, bat detectors recorded bat activity for six nights in July–September 1993 and 1994.

    (Summarised by: Anna Berthinussen)

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 21

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust