Influence of competition on size, brood production and sex ratio in spruce beetles (Col.: Scolytidae)

Authors

  • L. Safranyik Pacific Forestry Centre Canadian Forestry Service Victoria, B.C.
  • D. A. Linton Pacific Forestry Centre Canadian Forestry Service Victoria, B.C.

Keywords:

spruce beetle, <i>Dendroctonus rufipennis</i>, Coleoptera, Scolytidae

Abstract

In spruce beetles, <i>Dendroctonus rufipennis</i> Kirby, the effects of intraspecific competition on reproductive biology were studied in the laboratory at constant temperature. The factors were: egg gallery length, brood production per female, adult size in the broods, and sex ratio of the young spruce beetles, using egg gallery spacings of 1, 3, 6, 9 and 12 per 30 cm. All variables except sex ratio were significantly and inversely related to gallery spacing. The results indicate that density-dependent compensatory processes operate in spruce beetle populations during gallery construction and brood development.

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Published

2019-09-17

Issue

Vol. 82 (1985): Journal of the Entomological Society of British Columbia

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Articles

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