Researches on Population Ecology

, Volume 37, Issue 1, pp 29–36 | Cite as

Demographic attributes of an introduced herbivorous lady beetle

  • Takayuki Ohgushi
  • Hiroichi Sawada
Original Paper

Abstract

Demographic attributes of the adults of an introduced herbivorous lady beetleEpilachna niponica (Coleoptera: Coccinellidae) were investigated from 1975 to 1981 in the Botanical Garden of Kyoto University. Population growth rate varied from 4.8 to 16.8 throughout the study period. Fecundity and mortality in the late larval period contributed most to annual changes in the population growth rate. Population growth rate was negatively correlated with the density of overwintering adults. Adult survival from emergence to the reproductive season, which varied from 0.03 to 0.36 throughout the study, was almost completely determined by survival during the pre-hibernation period. Adult survival to the preproductive season changed in a size- and sex-dependent manner. Larger adults survived better than smaller individuals; male-biased mortality occurred from adult emergence to the reproductive age. Severe intraspecific competition among late instar larvae due to host plant defoliation produced a higher proportion of small-sized adults, resulting in lower adult survival to hibernation. The introduced population had a higher population growth rate and a lower adult survival to the reproductive season than the source population.

Key words

Adult survival body size Epilachna niponica herbivorous insect intraspecific competition introduced population population growth rate source population 

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Copyright information

© Society of Population Ecology 1995

Authors and Affiliations

  • Takayuki Ohgushi
    • 1
  • Hiroichi Sawada
    • 1
  1. 1.Laboratory of Entomology, Faculty of AgricultureKyoto UniversityKyotoJapan

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