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Monday, April 9 • 11:30am - 11:45am
SYMPOSIA-04: Simulating the Relationship Between Movement Behavior of Dispersing Animals and the Distribution of Active Subsidies

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AUTHORS: Daniel Bampoh*, Purdue University; Julia E. Earl, Louisiana Tech University; Patrick Zollner, Purdue University

ABSTRACT: Active subsidies are resource transfers by animals navigating ecosystems within landscapes. Animal movement behavior has the potential to significantly mediate the extent and intensity of ecological subsidies and corresponding ecosystem responses. Correlated random walk (CRW) and Lévy walk (LW) models are stochastic random-walk patterns that simulate animal dispersal and foraging movement behavior. We use spatially explicit individual-based model (IBM) simulations to investigate the relative effect of CRW and LW with mortality on the intensity and extent of nutrient (dead) and consumer (living) subsidy distribution. We found that variation in movement pattern scaling is the most significant determinant of the distances over which subsidies are deposited and the mortality probability was the strongest predictor of the impact or density of subsidy deposition for both living (consumer) and dead (nutrient or energy) subsidies. Consumer subsidies deposit further and at lower densities than nutrient subsidies, and straighter (CRW) and more scale-invariant (LW) movement result in the further displacement at lower densities for both consumer and nutrient subsidies. More scale-invariant (LW) movement at lower mortality deposits subsidies further and at lower densities than straighter (CRW) movements for both consumer and nutrient subsidies. Sinuous (CRW) and less scale-invariant (LW) movements deposit subsidies closer to the ecosystem boundary with higher densities at high mortality. Mortality as a function of distance deposits higher amounts of nutrient subsidies at lower densities than mortality as a function of time for LW. The results underscore the importance of characteristic animal movement behavior to understand and potentially predict variations in the impacts of animal-transported subsidies, which could have implications for species conservation, wildlife, and invasive species management.

Monday April 9, 2018 11:30am - 11:45am CDT
Adams Room