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Distribution and Habitat Association of the Northern Long-Eared Bat Zachary A

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Distribution and Habitat Association of the Northern Long-Eared Bat Zachary A University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Dissertations & Theses in Natural Resources Natural Resources, School of 8-2018 Distribution and Habitat Association of the Northern Long-eared Bat Zachary A. Warren University of Nebraska - Lincoln, [email protected] Follow this and additional works at: http://digitalcommons.unl.edu/natresdiss Part of the Hydrology Commons, Natural Resources and Conservation Commons, Natural Resources Management and Policy Commons, Other Environmental Sciences Commons, and the Water Resource Management Commons Warren, Zachary A., "Distribution and Habitat Association of the Northern Long-eared Bat" (2018). Dissertations & Theses in Natural Resources. 277. http://digitalcommons.unl.edu/natresdiss/277 This Article is brought to you for free and open access by the Natural Resources, School of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Dissertations & Theses in Natural Resources by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. DISTRIBUTION AND HABITAT ASSOCIATION OF THE NORTHERN LONG- EARED BAT by Zachary A. Warren A THESIS Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Master of Science Major: Natural Resource Sciences Under the Supervision of Professor Craig Allen Lincoln, Nebraska August, 2018 DISTRIBUTION AND HABITAT ASSOCIATION OF THE NORTHERN LONG- EARED BAT Zachary A. Warren, M.S. University of Nebraska, 2018 Advisor: Craig R. Allen Because of white-nose syndrome, the northern long-eared bat (Myotis septentrionalis) is experiencing rapid population declines across the majority of its range. This decline has prompted increased regulatory protection and thus an increased need for effective habitat management strategies. Insight into the species habitat associations, however, is a prior necessity to ensure management practices are biologically relevant. Understanding these relationships requires a holistic approach that addresses the multiple ways in which the species is interacting with its environment. The objective of my thesis was to address these relationships following a multi-scale approach that assessed the factors associated with roost tree selection, distribution, and habitat use. I conducted a quantitative meta-analysis of all northern long-eared bat roost-selection studies, thus enabling inference across the range of the species. Secondly, I sought to understand the factors associated with the northern long-eared distribution in Nebraska by conducting a multiscale occupancy study with four acoustic survey stations nested within 101 10 km x 10 km grids distributed across Nebraska. Lastly, to assess factors associated with multi- scale occupancy at finer spatial scales, I combined presence/absence results from 5 intensively sampled study sites in Nebraska with on-the-ground habitat measurements. Results from the meta-analysis indicate selected roost trees had a greater amount of bark remaining on the bole, a larger diameter at breast height, a lower decay class, and were taller. Results from the statewide occupancy study provide evidence for relationships between large-scale occupancy (ψ) and forest clumpiness, proximity to potential hibernacula, and summer temperature. Within occupied grids, evidence supported a positive relationship between small-scale occupancy (θ) and forest area within 125 m. Results failed to provide evidence of habitat factors associated with ψ at the 5 study sites likely due to high presence of the species. Evidence, however, did support a positive relationship between canopy closure and θ. Reported occupancy estimates between the two studies results serve as a pre-white-nose syndrome baseline, as I collected all data prior to the detection of white-nose syndrome in Nebraska. i Acknowledgments I wish to thank my wife for the endless support and understanding she provided during this process. I also thank Sarah Haas who supported a young technician’s desire to learn all he could about desert bats. I thank my field technicians, Cody Dreier, Samantha Lange, Aaron Aguirre, and Catherine Berrick. They drove countless miles, worked long hours in the Nebraska heat, entered thousands of lines of data, and most importantly maintained a positive attitude. Without their dedication to the project, none of this would have been possible. I thank the hundreds of Nebraska landowners that provided access to their property and exhibited a genuine dedication to wildlife conservation on their land. I thank Nebraska Game and Parks staff for their guidance, support, and land access. I thank my Department of Transportation technical advisory committee for their support and guidance to ensure I addressed the conservation needs for the Department. I thank my committee members for their guidance and understanding. I thank my office support staff, Wilma Gerena and Caryl Cashmere, for their endless understanding and support keeping the project running as smoothly as possible. I thank the other coop unit graduate students for their advice, coding prowess, encouragement, and comradery. I thank my advisor, Craig Allen, for broadening my ecological understanding beyond the world of bats and for supporting me both personally and professionally through a lengthy journey. I thank Michael Whitby for countless white-board sessions, coding assistance, research advice, mentorship, friendship, and the opportunity to come to Nebraska. Lastly, I thank Baxter Seguin for his unwavering support, a couch to crash on, a listening ear, exceptional advice, and his generous friendship. I cannot imagine the last few years without the support of the Nebraska Bat Team. ii Grant Information A grant from The Nebraska Department of Transportation provided financial support for this project. iii Table of Contents FRONT MATTER Abstract Acknowledgments................................................................................................ i Grant Information ............................................................................................... ii Table of Contents ............................................................................................... iii List of Tables ...................................................................................................... v List of Figures ................................................................................................... vii CHAPTER 1: AN INTRODUCTION TO THE DISTRIBUTION AND HABITAT ASSOCIATION OF THE NORTHERN LONG-EARED BAT ............................ 1 Introduction ......................................................................................................... 1 Literature Cited ................................................................................................... 5 CHAPTER 2: A QUANTITATIVE META-ANALYSIS OF NORTHERN LONG- EARED BAT ROOSTING BEHAVIOR ............................................................... 9 Introduction ......................................................................................................... 9 Methods............................................................................................................. 11 Results ............................................................................................................... 16 Discussion ......................................................................................................... 19 Literature Cited ................................................................................................. 27 Tables and Figures ............................................................................................ 31 CHAPTER 3: THE SPATIAL DISTRIBUTION OF NORTHERN LONG-EARED BATS DURING MATERNITY SEASON IN NEBRASKA ............................... 54 Introduction ....................................................................................................... 54 Methods............................................................................................................. 57 Results ............................................................................................................... 67 Discussion ......................................................................................................... 71 Literature Cited ................................................................................................. 79 Tables and Figures ............................................................................................ 86 CHAPTER 4. UTILIZING A MULTI-SCALE OCCUPANCY APPROACH TO UNDERSTAND THE FACTORS THAT AFFECT OCCUPANCY AND DETECTION OF THE NORTHERN LONG-EARED BAT ............................. 101 Introduction ..................................................................................................... 101 Methods........................................................................................................... 104 Results ............................................................................................................. 113 Discussion ....................................................................................................... 115 iv Literature Cited ............................................................................................... 118 Tables and Figures .......................................................................................... 124 CHAPTER 5: SYNTHESIZING THE FACTORS ASSOCIATED WITH ROOST
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