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Density cycles and an offspring quantity and quality game driven by natural selection

Nature volume 406, pages 985–988 (2000)Cite this article

Abstract

A long-standing hypothesis1,2 posits that natural selection can favour two female strategies when density cycles. At low density, females producing many smaller progeny are favoured when the intrinsic rate of increase, r, governs population growth. At peak density, females producing fewer, high-quality, progeny are favoured when the carrying capacity, K, is exceeded and the population crashes. Here we report on the first example of a genetic r versus K selection3,4,5 game that promotes stable population cycles in lizards. Decade-long fitness studies and game theory demonstrated that two throat-colour morphs were refined by selection in which the strength of natural selection varied with density. Orange-throated females, r strategists, produced many eggs and were favoured at low density. Conversely, yellow-throated females, K strategists, produced large eggs and were favoured at high density. Progeny size should also be under negative frequency-dependent selection in that large progeny will have a survival advantage when rare, but the advantage disappears when they become common. We confirmed this prediction by seeding field plots with rare and common giant hatchlings. Thus, intrinsic causes of frequency- and density-dependent selection promotes an evolutionary game with two-generation oscillations.

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Figure 1: Cycles of demographic parameters and natural selection on egg mass.
Figure 2: Natural selection on throat-colour morphs.
Figure 3: Density-dependent survival and frequency-dependent selection on egg mass.
Figure 4: Frequency of orange female morphs and juvenile survival.

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Acknowledgements

We thank O. Bjornstad, C. Both, R. Calsbeek, A. Chaine, D. Croll, D. Doak, J. Estes, G. Pogson, N. Janzen, D. Kellogg, P. Lundberg, B. Lyon and J. Vogelzang for comments. Research was supported by NSF grants to B.S. and STINT, Fullbright, and NFR grants to E.S. We thank P. Stadler and R. Schrimp for permission to work on their land.

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  1. Erik Svensson

    Present address: Department of Animal Ecology, Lund University, S-223 62, Lund, Sweden

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  1. Department of Ecology and Evolutionary Biology, Earth and Marine Sciences Building, University of California, Santa Cruz, 95064, California, USA

    Barry Sinervo, Erik Svensson & Tosha Comendant

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Correspondence to Barry Sinervo.

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Sinervo, B., Svensson, E. & Comendant, T. Density cycles and an offspring quantity and quality game driven by natural selection. Nature 406, 985–988 (2000). https://doi.org/10.1038/35023149

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