Date of Award
Level of Access
Master of Science (MS)
Wildlife Ecology and Wildlife Conservation
Second Committee Member
Third Committee Member
Early successional forest and shrubland habitats are collectively called young forest. Changes in disturbance regimes and land use conversion resulted in declines of young forest and associated wildlife across eastern North America. Conservation of declining young forest birds relies on the maintenance and creation of young forest habitats used for breeding. American Woodcock (AMWO; Scolopax minor) and Golden-winged Warbler (GWWA; Vermivora chrysoptera) are two declining young forest species. Conservation plans for both species use an adaptive management framework, which is an iterative process of planning, management actions, and monitoring and evaluation, in the context of species conservation goals. Adaptive management programs often fail to meet their conservation goals when monitoring and evaluation is missing or ineffective. To address this short coming, my research focuses on the monitoring and knowledge gathering aspects of the iterative process.
First, I investigated the role of landowners in monitoring the response of AMWO to habitat management on private properties. I interviewed Wisconsin landowners to determine their monitoring preferences and then developed a pilot monitoring protocol where landowner citizen scientists documented the response of male AMWO to habitat management on their properties. I conducted sideby- side AMWO monitoring with landowners followed by an interview to gauge landowner understanding, ability, and satisfaction with the monitoring protocol. Although landowners were willing and excited to participate in AMWO monitoring, their hearing often limited their ability to collect quality data. In order to create a successful AMWO monitoring program that suits the needs of landowners and managers, I recommend in-person training, periodic hearing assessments, and flexible data submittal options.
Second, I quantified the response of male GWWA to woody vegetation shearing, a best management practice intended to create quality breeding habitat. GWWA point counts and associated patch-level vegetation surveys were conducted in three habitat management types throughout Minnesota and Wisconsin (mature alder shrubland, sheared alder shrubland, and sheared aspen sapling). Using integrated likelihood models in a distance sampling framework, I investigated the impact of 1) habitat management, and 2) patch-level vegetation characteristics, on the relative abundance of male GWWA. Habitat-management type and habitat age were included in my top supported management model, and occurrence of graminoids, no woody regeneration, and 1-2m tall woody regeneration were supported habitat factors affecting male GWWA abundance. I recommend the continuation of the shearing management practice, particularly when habitat elements are missing.
Finally, I tracked the migratory connectivity patterns of GWWA and Blue-winged Warbler (BWWA; Vermivora cyanoptera) in four previously unstudied populations. I used light-level geolocators deployed on male Vermivora to determine individual wintering ranges. Previous research has shown weak migratory connectivity structure in BWWA and strong migratory connectivity structure in GWWA, with GWWA breeding in the Great Lakes region wintering in Central America and those breeding in the Appalachians wintering in South America. I discovered previously unknown intricacies of GWWA migratory connectivity structure with birds from one site in the Great Lakes region wintering in Central America (n=2) and South America (n=3). I propose incorporating migratory connectivity as a criterion for population segment and conservation region designation.
Buckardt Thomas, Anna, "Improving Conservation of Declining Young Forest Birds Through Adaptive Management" (2019). Electronic Theses and Dissertations. 2999.