Title page for ETD etd-08192005-145124


Type of Document Master's Thesis
Author LeGrand, Holly Grace
Author's Email Address hlegra1@lsu.edu
URN etd-08192005-145124
Title Associations of Avian and Herpetofauna Communities with Forest Management at Multiple Spatial Scales
Degree Master of Science (M.S.)
Department Renewable Natural Resources
Advisory Committee
Advisor Name Title
Michael J. Chamberlain Committee Chair
Craig Miller Committee Member
Keith Ouchley Committee Member
Tom Dean Committee Member
Keywords
  • AIC
  • principal components
  • forest management
  • GLIMMIX
Date of Defense 2005-08-10
Availability unrestricted
Abstract
Decline of amphibians, reptiles, and numerous Neotropical migrant birds has been attributed to habitat destruction and alteration, which warrants examination of these groups in managed forests and their association with habitat characteristics at multiple spatial scales. We surveyed avifauna and herpetofauna communities in 3 managed forests in Louisiana during 2003-2004. Study areas included Sherburne Wildlife Management Area (WMA), a bottomland hardwood forest under uneven-aged management, Benís Creek WMA, an even-aged, short-rotation loblolly pine plantation, and Sandy Hollow WMA, a longleaf pine-savannah maintained with prescribed fire. Field techniques included surveys consisting of avian point counts, drift fence arrays (PFFT), cover boards, visual encounters, anuran calls (ACS), and microhabitat. We derived landscape variables with GIS landcover maps and ArcView GIS 3.3. General trends included the following: PFFT and ACS accounted for the greatest percentage of detections among herpetofauna surveys, and results primarily reflect these efforts. Anuran calling surveys made a substantial contribution to total number species of detected. Species of conservation concern were among detections of both early- and late-successional bird species. At Sherburne, abundance and richness of amphibians, and occurrence of late-successional birds were greater in uncut and individual-selection stands, whereas occurrence of early-successional birds was greater in recent selection cuttings with groups. Abundance of reptiles did not differ across stand type. At Benís Creek, abundance and richness of anurans was greater in 1-year and 11-23-year stands, whereas abundance and richness of lizards was similar across stand age. Late-successional bird species occurred with greater frequency in 11-23-year stands at Benís Creek, whereas frequency of occurrence of early-successional bird species was greater in 1-year and 4-5-year stands. At Sandy Hollow, abundance of reptiles was greater than amphibians, and occurrence of avifauna was similar to pine-savannah ecosystems elsewhere. Responses to habitat factors at all scales were species specific. In general, canopy closure and shrub cover were the most frequent predictors of occurrence at the microhabitat scale. At the landscape scale, canopy closure and streamside management zones were important predictors of occurrence at Benís Creek, whereas openings and shape complexity of longleaf pine and longleaf savannah were frequent predictors of occurrence at Sandy Hollow. Effects of selection cutting and stand age appear to benefit certain species, including species of conservation concern, but are potentially costly for other species. Efforts to combine management of timber with conservation of amphibians, reptiles, and songbirds must take into consideration both the complexity of habitat requirements of species within these groups and the landscape context in which these requirements occur.
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