Mar 23, 2002

K-selection, alpha-selection, effectiveness, and tolerance in competition: density-dependent selection revisited

Journal of Genetics
Amitabh JoshiMallikarjun Shakarad

Abstract

In the Drosophila literature, selection for faster development and selection for adapting to high density are often confounded, leading, for example, to the expectation that selection for faster development should also lead to higher competitive ability. At the same time, results from experimental studies on evolution at high density do not agree with many of the predictions from classical density-dependent selection theory. We put together a number of theoretical and empirical results from the literature, and some new experimental results on Drosophila populations successfully subjected to selection for faster development, to argue for a broader interpretation of density-dependent selection. We show that incorporating notions of alpha-selection, and the division of competitive ability into effectiveness and tolerance components, into the concept of density-dependent selection yields a formulation that allows for a better understanding of the empirical results. We also use this broader formulation to predict that selection for faster development in Drosophila should, in fact, lead to the correlated evolution of decreased competitive ability, even though it does lead to the evolution of greater efficiency and higher population g...Continue Reading

  • References24
  • Citations17

References

Mentioned in this Paper

Competitive Behavior
Crowding
Drosophila
Underpopulation
Subfecundity
Metazoa
Selection, Genetic

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