Evolution of a Balanced Sex Ratio by Frequency-Dependent Selection in a Fish

Balanced (1 to 1) sex ratios are thought to evolve by a process known as frequency-dependent selection of the minority sex. Five populations of a fish with genetically based variation in temperature-dependent sex determination were maintained for 5 to 6 years in artificial constant-temperature envir...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 1990-12, Vol.250 (4987), p.1556-1558
Hauptverfasser:	Conover, David O., Van Voorhees, David A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Animal reproduction Biological and medical sciences Biological evolution Brackish Effect of water temperature on Embryos Evolution Fish Fishes Fishing lines Freshwater Fundamental and applied biological sciences. Psychology Genetics Genetics of eukaryotes. Biological and molecular evolution Larval development Marine Marine biology Menidia menidia Population genetics Reproduction Sex determination Sex ratio Sexes Temperature ratio Water temperature Young animals
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Beschreibung
Zusammenfassung:	Balanced (1 to 1) sex ratios are thought to evolve by a process known as frequency-dependent selection of the minority sex. Five populations of a fish with genetically based variation in temperature-dependent sex determination were maintained for 5 to 6 years in artificial constant-temperature environments that initially caused the sex ratio to be highly skewed. Increases in the proportion of the minority sex occurred in subsequent generations until a balanced sex ratio was established, thus confirming a central premise underlying the theory of sex-ratio evolution.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.250.4987.1556