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Intra- and intergenotypic competition in Drosophila melanogaster: effects of density on larval survival and rate of development

  • Author(s): Moya, A
  • González-Candelas, F
  • Ayala, FJ
  • et al.
Abstract

We have examined the effects of density and frequency in the larval competition of Drosophila melanogaster by measuring three fitness components: viability (V), mean development time (MDT) and a combination of these two (E). We have detected (contrary to most published results) non-linear effects of density in single-genotype cultures; in addition, different functions are required to describe the density effects below and above the optimal density. Frequency has also non-linear effects in the two-genotype cultures. Only one polymorphic equilibrium frequency, which is stable, occurs with respect to V; but two polymorphic equilibria, one stable and one unstable, exist with respect to E. The responses in single-genotype cultures do not allow one to predict the outcome of the competition in two-genotype cultures. © 1986 Dr W. Junk Publishers.

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