2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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9/26/2018 | 5:00 PM - 5:15 PM | Range-Wide Abundance of Lesser Prairie-Chickens (2012-2018): Population Trend, Effect of Conservation Practices, and Comparison of Classical and Spatially Explicit Methods of Analysis | Eccles Conference Center Auditorium

Range-Wide Abundance of Lesser Prairie-Chickens (2012-2018): Population Trend, Effect of Conservation Practices, and Comparison of Classical and Spatially Explicit Methods of Analysis

The Western Association of Fish and Wildlife Agencies has overseen an aerial survey of lesser prairie-chicken (Tympanuchus pallidicinctus, LPCH) since 2012, with the objective to estimate the range-wide and ecoregional abundances of the species. Approximately 250-300 grid cells (15 × 15 km) were surveyed annually, with two line transects surveyed in each, following a multiple-observer distance-sampling protocol. Analyses to date used classical distance-sampling methods to estimate abundance range-wide and within each of four ecoregions, while accounting for variation in detectability due to distance from transect, group size, and five coarse habitat classes. Since the survey was designed, Geographical Information System (GIS) data layers have become readily available describing finer-scale habitat characteristics potentially related to LPCH abundance. We summarized these data layers to describe the prevalence and patch sizes of vegetative landcover types, conservation practices, and anthropogenic land uses within each surveyed grid cell. These GIS datasets allowed for spatially explicit predictions of LPCH abundance relative to habitat characteristics at a finer spatial scale (15 × 15 km grid cells) than former analyses (broad ecoregions). We analyzed the LPCH data using both the classical and spatially explicit methods, and we present preliminary results on range-wide abundance trends based on each method. We also compare the relative performance of each method. In addition we report on modeled relationships between abundance and habitat characteristics, including conservation and other anthropogenic practices. Finally, we contrast insights from this abundance estimation with those gained from a parallel analysis of LPCH multi-scale occupancy using only presence-absence data.

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Presenters/Authors

Jason Carlisle (), Western EcoSystems Technology, Inc., jcarlisle@west-inc.com;