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Intraspecific competition favours niche width expansion in Drosophila melanogaster

Nature volume 410, pages 463–466 (2001)Cite this article

Abstract

Ecologists have proposed that when interspecific competition is reduced, competition within a species becomes a potent evolutionary force leading to rapid diversification1. This view reflects the observation that populations invading species-poor communities frequently evolve broader niches2. Niche expansion can be associated with an increase in phenotypic variance3,4 (known as character release5), with the evolution of polymorphisms6,7,8,9, or with divergence into many species using distinct resources10,11,12,13 (adaptive radiation). The relationship between intraspecific competition and diversification is known from theory14,15, and has been used as the foundation for some models of speciation16,17,18,19,20. However, there has been little empirical proof that niches evolve in response to intraspecific competition. To test this hypothesis, I introduced cadmium-intolerant Drosophila melanogaster populations to environments containing both cadmium-free and cadmium-laced resources. Here I show that populations experiencing high competition adapted to cadmium more rapidly than low competition populations. This provides experimental confirmation that competition in a population can drive niche expansion onto new resources for which competition is less severe.

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Figure 1: High competition Drosophila populations (squares) adapt to cadmium more rapidly than low competition populations (crosses).
Figure 2: Survivorship of eggs from matings of parents emerging from different cadmium concentrations.

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Acknowledgements

I thank S. Nuzhdin, M. Doebeli, R. Haygood, M. Servedio and B. Holland for discussions on experimental design. P. Wescott, E. Barker and E. Baumgartner provided invaluable laboratory help. This research was supported by a Daphne and Ted Pengelly Grant (UC Davis), an NSF grant to S. Nuzhdin, and an NSF Pre-doctoral Fellowship.

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  1. Center for Population Biology, Storer Hall, University of California, Davis, 95616, California, USA

    Daniel I. Bolnick

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Bolnick, D. Intraspecific competition favours niche width expansion in Drosophila melanogaster. Nature 410, 463–466 (2001). https://doi.org/10.1038/35068555

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