Study

Protecting red-cockaded woodpecker cavity trees predisposed to fire-induced mortality

  • Published source details Williams B.W., Moser E.B., Hiers J.K., Gault K. & Thurber D.K (2006) Protecting red-cockaded woodpecker cavity trees predisposed to fire-induced mortality. Journal of Wildlife Management, 70, 702-707.

Summary

From the mid-1990s onward, construction of artificial cavities and rotational burning to maintain longleaf pine Pinus palustris habitat are amongst measure that have enabled red-cockaded woodpecker Picoides borealis numbers to increase on Eglin Air Force Base, Florida (southeast USA). However, about 28% of natural cavity trees (6,226) surveyed since 1995 are dead, fire being responsible for 26% of deaths. Measures to reduce fire-induced mortality of longleaf cavity trees (used by woodpeckers) as a result of prescribed burns were assessed.

Prior to the 2001 burning season, 800 active and inactive cavity trees had one of six protection treatments applied: 1) clearing with hand tools and light raking; 2) mechanical clearing (using a mower); 3) mechanical clearing and light raking; 4) mechanical clearing and raking to mineral soil; 5) burning out from tree base prior to the actual burn; and 6) control (no treatment).

Treatments were assigned randomly but followed U.S. Fish and Wildlife Service recommendations such that active trees received only treatments 1, 3 and 5, and treatment 2 was applied only to trees with large, long-inactive cavities. Trees were monitored for post-burn survival after 1 year, and data collected on a range of characteristics useful in determining cavity tree predisposition to fire-induced mortality.

Protected tree mortality (2.6%) was significantly lower than that of unprotected trees (6.2%). Protection method did not differ in effectiveness at preventing mortality. Bark char was also significantly less on protected trees (again, no differences apparent among protection treatments). Extent of truck charring, needle scorch, sap cover, and whether the cavity burned were the characteristics most closely related to tree deaths.

The authors recommend that for greatest efficacy, percent of the bole covered in sap (sap being prone to ignition) and cavity height should be considered when deciding whether or not to implement protective measures. Mechanical clearing was the most efficient (least amount of time and resources) preparation method.

Note: If using or referring to this published study please read and quote the original paper, this can be viewed at: http://www.jonesctr.org/research/research_publications/Unrestricted/WilliamsJrlofWildlifeManagement70P702.pdf

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 19

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 Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust