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20:36
Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
Published on: July 4, 2007
Predicting bison migration out of Yellowstone National Park using bayesian models
Chris Geremia1, P J White, Rick L Wallen
1Yellowstone Center for Resources, National Park Service, Yellowstone National Park, Wyoming, United States of America. Chris_Geremia@nps.gov
Plos One
|February 23, 2011
Summary
Conserving migratory ungulates like Yellowstone bison requires integrating scientific data into management. Allowing bison to migrate outside park boundaries during severe weather may prevent population declines.
Area of Science:
- Wildlife ecology
- Conservation biology
- Population dynamics
Background:
- Long-distance ungulate migrations often cross protected area boundaries, leading to human-wildlife conflicts and management actions that can threaten populations.
- The Yellowstone National Park bison population (Bison bison) is partially migratory and faces challenges from bovine brucellosis exposure and culling of migrating individuals.
- Management of migratory wildlife necessitates integrating scientific understanding of their movements and ecological drivers.
Purpose of the Study:
- To integrate scientific data into management policies for conserving migratory ungulates, using the Yellowstone bison population as a case study.
- To develop predictive models for bison migration patterns to inform conservation strategies.
- To assess the impact of environmental factors and population size on bison migration dynamics.
Main Methods:
- Utilized a hierarchical Bayesian framework to assimilate data and model competing hypotheses of bison migration from 1990-2009.
- Developed a unifying logistic model to predict migration patterns for different bison herds.
- Analyzed the influence of herd size, snow water equivalent, and dried biomass on migration beyond park boundaries.
Main Results:
- Bison migration patterns varied at the herd scale, but a single logistic model effectively predicted migration for both herds.
- Migration beyond the northern park boundary was significantly influenced by herd size, snow water equivalent, and dried biomass.
- Migration beyond the western park boundary showed less influence from these predictors, suggesting other unmodeled factors are important.
Conclusions:
- Simulations indicate that allowing bison to migrate beyond park boundaries during severe climate conditions may be crucial for avoiding future population reductions.
- Incorporating long-distance migration dynamics into management policies is essential for effective conservation of migratory ungulate populations.
- This study exemplifies the application of ecological modeling to inform evidence-based wildlife management decisions.
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