Relationships among burn severity, forest canopy structure and bat activity from spring burns in oak–hickory forests
Michael J. Lacki A F , Luke E. Dodd B , Nicholas S. Skowronski C , Matthew B. Dickinson D and Lynne K. Rieske E
+ Author Affiliations
- Author Affiliations
A Department of Forestry and Natural Resources, University of Kentucky, Lexington, KY 40546, USA.
B Department of Biological Sciences, Eastern Kentucky University, Richmond, KY 40475, USA.
C USDA Forest Service, Northern Research Station, Morgantown, WV 26505, USA.
D USDA Forest Service, Northeastern Research Station, Forestry Sciences Lab, Delaware, OH 43015, USA.
E Department of Entomology, University of Kentucky, Lexington, KY 40546, USA.
F Corresponding author. Email: mlacki@uky.edu
International Journal of Wildland Fire 26(11) 963-972 https://doi.org/10.1071/WF16159
Submitted: 20 August 2016 Accepted: 10 August 2017 Published: 27 October 2017
Abstract
The extent to which prescribed fires affect forest structure and habitats of vertebrate species is an important question for land managers tasked with balancing potentially conflicting objectives of vegetation and wildlife management. Many insectivorous bats forage for insect prey in forested habitats, serving as the primary predators of nocturnal forest insects, and are potentially affected by structural changes in forests resulting from prescribed fires. We compared forest-stand characteristics of temperate oak–hickory forests, as measured with airborne laser scanning (light detection and ranging, LiDAR), with categorical estimates of burn severity from prescribed fires as derived from Landsat data and field-based Composite Burn Indices, and used acoustic monitoring to quantify activity of insectivorous bats in association with varying degrees of burn severity (unburned habitat, low severity and medium severity). Forest-stand characteristics showed greatest separation between low-severity and medium-severity classes, with gap index, i.e. open-air space, increasing with degree of burn severity. Greater mid-storey density, over-storey density and proportion of vegetation in the understorey occurred in unburned habitat. Activity of bats did not differ with burn severity for high-frequency (clutter-adapted or closed-space foragers) or low-frequency (edge or open-space foragers) bats. Results indicate that differing degrees of burn severity from prescribed fires produced spatial variation in canopy structure within stands; however, bats demonstrated no shifts in activity levels to this variation in canopy structure, suggesting prescribed fire during the dormant season, used as a management practice targeting desired changes in vegetation, is compatible with sustaining foraging habitat of insectivorous bats.
Additional keywords: clutter-adapted foragers, Eptesicus, foraging activity, habitat structure, insectivorous bats, Lasionycteris, Lasiurus, LiDAR, Myotis, Nycticeius, open-space foragers, Perimyotis, prescribed fire.
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