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| Density cycles and an offspring quantity and quality game driven by natural selection |
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| Author(s): Sinervo B, Svensson E, Comendant T |
| Source: NATURE Volume: 406 Issue: 6799 Pages: 985-988 Published: AUG 31 2000 |
| Times Cited: 121 References: 28 |
| Abstract: A long-standing hypothesis(1,2) 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 selection(3-5) 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. |
| Document Type: Article |
| Language: English |
| Reprint Address: Sinervo, B (reprint author), Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, Earth & Marine Sci Bldg, Santa Cruz, CA 95064 USA |
Addresses:
1. Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, Santa Cruz, CA 95064 USA |
| Publisher: MACMILLAN PUBLISHERS LTD, PORTERS SOUTH, 4 CRINAN ST, LONDON N1 9XW, ENGLAND |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: 348ZW |
| ISSN: 0028-0836 |
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