Abstract
In most animals, the origins of mating preferences are not clear. The "sensory-bias" hypothesis proposes that biases in female sensory or neural systems are important in triggering sexual selection and in determining which male traits will become elaborated into sexual ornaments. Subsequently, other mechanisms can evolve for discriminating between high- and low-quality mates. Female guppies (Poecilia reticulata) generally show a preference for males with larger, more chromatic orange spots. It has been proposed that this preference originated because it enabled females to obtain high-quality mates. We present evidence for an alternative hypothesis, that the origin of the preference is a pleiotropic effect of a sensory bias for the colour orange, which might have arisen in the context of food detection. In field and laboratory experiments, adult guppies of both sexes were more responsive to orange-coloured objects than to objects of other colours, even outside a mating context. Across populations, variation in attraction to orange objects explained 94% of the inter-population variation in female mate preference for orange coloration on males. This is one of the first studies to show both an association between a potential trigger of a mate-choice preference and a sexually selected trait, and also that an innate attraction to a coloured inanimate object explains almost all of the observed variation in female mate choice. These results support the "sensory-bias" hypothesis for the evolution of mating preferences.
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- Altarescu G., Moore D. F., Pursley R., Campia U., Goldstein S., Bryant M., Panza J. A., Schiffmann R. Enhanced endothelium-dependent vasodilation in Fabry disease. Stroke. 2001 Jul;32(7):1559–1562. doi: 10.1161/01.str.32.7.1559. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Archer S. N., Endler J. A., Lythgoe J. N., Partridge J. C. Visual pigment polymorphism in the guppy Poecilia reticulata. Vision Res. 1987;27(8):1243–1252. doi: 10.1016/0042-6989(87)90200-8. [DOI] [PubMed] [Google Scholar]
- Archer S. N., Lythgoe J. N. The visual pigment basis for cone polymorphism in the guppy, Poecilia reticulata. Vision Res. 1990;30(2):225–233. doi: 10.1016/0042-6989(90)90038-m. [DOI] [PubMed] [Google Scholar]
- Basolo A. L. Female preference predates the evolution of the sword in swordtail fish. Science. 1990 Nov 9;250(4982):808–810. doi: 10.1126/science.250.4982.808. [DOI] [PubMed] [Google Scholar]
- Basolo A. L. Phylogenetic evidence for the role of a pre-existing bias in sexual selection. Proc Biol Sci. 1995 Mar 22;259(1356):307–311. doi: 10.1098/rspb.1995.0045. [DOI] [PubMed] [Google Scholar]
- Endler J. A. Variation in the appearance of guppy color patterns to guppies and their predators under different visual conditions. Vision Res. 1991;31(3):587–608. doi: 10.1016/0042-6989(91)90109-i. [DOI] [PubMed] [Google Scholar]
- Enquist M., Arak A. Selection of exaggerated male traits by female aesthetic senses. Nature. 1993 Feb 4;361(6411):446–448. doi: 10.1038/361446a0. [DOI] [PubMed] [Google Scholar]
- Grether G. F. Carotenoid limitation and mate preference evolution: a test of the indicator hypothesis in guppies (Poecilia reticulata). Evolution. 2000 Oct;54(5):1712–1724. doi: 10.1111/j.0014-3820.2000.tb00715.x. [DOI] [PubMed] [Google Scholar]
- doi: 10.1098/rspb.1999.0938. [DOI] [PMC free article] [Google Scholar]
- Phelps S. M., Ryan M. J. Neural networks predict response biases of female túngara frogs. Proc Biol Sci. 1998 Feb 22;265(1393):279–285. doi: 10.1098/rspb.1998.0293. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ryan M. J. Sexual selection, receiver biases, and the evolution of sex differences. Science. 1998 Sep 25;281(5385):1999–2003. doi: 10.1126/science.281.5385.1999. [DOI] [PubMed] [Google Scholar]
- Stavenga D. G., Smits R. P., Hoenders B. J. Simple exponential functions describing the absorbance bands of visual pigment spectra. Vision Res. 1993 May;33(8):1011–1017. doi: 10.1016/0042-6989(93)90237-q. [DOI] [PubMed] [Google Scholar]