期刊
ECOLOGY LETTERS
卷 4, 期 3, 页码 229-235出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1461-0248.2001.00223.x
关键词
chaos; nonlinear population dynamics; population control; phase space; population perturbations; ecological sensitivity; flour beetles; Tribolium
类别
We used small perturbations in adult numbers to control large fluctuations in the chaotic demographic dynamics of laboratory populations of the flour beetle Tribolium castaneum. A nonlinear mathematical model was used to identify a sensitive region of phase space where the addition of a few adult insects would result in a dampening of the life stage fluctuations. Three experimental treatments were applied: one in which perturbations were made whenever the populations were inside the sensitive region (in-box treatment), another where perturbations were made whenever the populations were outside the sensitive region (out-box treatment), and an unperturbed control. The in-box treatment caused a stabilization of insect densities at numbers well below the peak values exhibited by the out-box and control populations. This study demonstrates how small perturbations can be used to influence the chaotic dynamics of an ecological system.
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