Perturbation experiments and fluctuation enhancement in finite size of lattice ecosystems: Uncertainty in top-predator conservation |
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Authors: | Hiroyasu Nagata Satoru Morita Jin Yoshimura Tokiya Nitta Kei-ichi Tainaka |
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Institution: | aShizuoka University, Department of Systems Engineering, Hamamatsu 432-8561, Japan;bTokai University, Department of Navigation, Course of Logistics, Shizuoka 424-8610, Japan |
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Abstract: | Study of perturbation experiments is crucial for conservation biology. We carry out Monte Carlo simulations on finite-size lattices composed of n species (n ≤ 4). The value of mortality rate m of top predator is altered to a higher or lower level, and a fluctuation enhancement (FE) is explored. Here FE means an uncertainty in population dynamics. It is found for n ≥ 2 that FE is observed, when m is decreased. Namely, when we protect the top predator, its population dynamics becomes very difficult to predict. |
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Keywords: | Monte Carlo simulation Top-predator conservation Fluctuation enhancement Finite-size lattice Linear Langevin equation Population uncertainty |
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