Long-term persistence of agricultural pest insects by risk-spreading dispersal

Abstract

© 2018, The Ecological Society of Japan. Insects are the most diverse organisms on earth consisting of more than 900 thousand species. However, only few of them are considered agricultural pests. Life history traits such as high fecundity, fast population growth, and high dispersal ability have been used to characterize agricultural pest insects. However, many other non-pest insects also share these traits, which indicates that there has not been a decisive condition characterizing agricultural pest insects. Agricultural habitats are risky and ephemeral to pests because of pest control and harvesting. The usual arithmetic mean fitness cannot be used to measure the persistence of these pests, because the maximal mean fitness is achieved only when they exhibit no dispersal, but that leads to immediate extinction. Using a geometric mean fitness model, we propose a quantitative measure of long-term reproductive success for agricultural pest insects. By using this approach, we can evaluate the trade-off between long-distance dispersal and high reproduction correctly and estimate the condition for the long-term persistence of pest insects in agricultural habitats. We discuss some general perspectives of pest control from the proposed characterization.

Source or Periodical Title

Ecological Research

ISSN

9123814

Page

1031-1037

Document Type

Article

Subject

Agricultural pest, Long-distance dispersal, Pest control, Risk of extinction, Risk-spreading

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