Invasive Species Management in Two-Patch Environments: Agricultural Damage Control in the Raccoon (Procyon Lotor Problem, Hokkaido, Japan)

Koji Kotani, Hiromasa Ishii, Hiroyuki Matsuda () and Tohru Ikeda ()
Additional contact information
Hiromasa Ishii: Yokohama National University, http://www.ynu.ac.jp/
Hiroyuki Matsuda: Yokohama National University, http://www.ynu.ac.jp/
Tohru Ikeda: Hokkaido University

No EMS_2009_01, Working Papers from Research Institute, International University of Japan

Abstract: We develop discrete-time models for analyzing the long run equilibrium outcomes on invasive species management in two-patch environments with migration. In particular, the focus is upon a situation where removal operations for invasive species are implemented only in one patch (controlled patch). The new features of the model are that (i) asymmetry in density dependent migration is considered, which may originate from impact of harvesting as well as heterogeneous habitat conditions, and (ii) the effect of density-dependent catchability is well-taken to account for the nature that the required effort level to remove one individual may rise as the existing population decreases. The model is applied for agricultural damage control in the raccoon problem that has occurred in Hokkaido, Japan. Numerical illustrations demonstrate that the long run equilibrium outcomes highly depend on the degree of asymmetry in migration as well as the sensitivity of catchability in response to a change in the population size of invasive species. Furthermore, we characterize the conditions under which the economically optimal effort levels are qualitatively affected by the above two factors and aiming at local extermination of invasive species in the controlled patch is justified.

Keywords: Catchability; Density dependent migration; Local extermination; metapopulation; Removal effort (search for similar items in EconPapers)
Pages: 30 pages
Date: 2009-01
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https://www.iuj.ac.jp/workingpapers/index.cfm?File=EMS_2009_01.pdf First version, 2009 (application/pdf)

Related works:
Working Paper: Invasive species management in two-patch environments: Agricultural damage control in the raccoon (procyon lotor) problem, Hokkaido, Japan (2007)
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