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Note: Session titles beginning with an asterisk (*) have student presenters.
AUTHORS: Helen E. Tripp, Auburn University, School of Forestry and Wildlife Sciences; Robert A. Gitzen, Auburn University, School of Forestry and Wildlife Sciences; Amy L. Silvano, Alabama Division of Wildlife and Freshwater Fisheries; James B. Grand, U.S. Geological Survey, Alabama Cooperative Fish and Wildlife Research Unit
ABSTRACT: Population projection models are applied tools for considering the potential effects of land and population management alternatives. Incorporating spatially explicit processes and individual dynamics into these models can be important when assessing viability for relatively small populations in patchy habitats. We developed a spatially-explicit, individual-based population simulation model (IBM) for gopher tortoises (Gopherus polyphemus) incorporating demographic rates from published studies throughout the range of the species. We then demonstrate this approach’s utility for evaluating potential viability under alternative management scenarios on two areas of state managed property in southern Alabama. Management scenarios included alternative forest management strategies with and without augmentation of tortoise populations. Under all scenarios, projected populations declined to local extinction within 100-200 years. The IBM projected sharper declines compared to projections from a non-spatial, stochastic, stage-structured model, potentially indicating the importance of considering spatial dynamics and individual interactions in this context. The IBM approach is especially useful when dealing with real management units because it allows for identification of projected hotspots of consistent occupancy and important habitat connections on the landscape.
Monday October 30, 2017 1:40pm - 2:00pm EDT
Carroll Ford