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Female masculinization and reproductive life history in the western mosquitofish (Gambusia affinis)

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Abstract

In this study, we explored the relationship between female masculinization and various morphological and reproductive parameters of male and female western mosquitofish (Gambusia affinis), including body size, anal fin length, testes mass and female fecundity. We detected high levels of female masculinization in the Brazos and Little Brazos Rivers (Falls County, Texas) in March 2008, but not 2009. In both populations, masculinized females were smaller, possessed shorter anal fins, and had significantly lower total fecundity (collective number of eggs and embryos) compared to non-masculinized females. In addition, 2008 non-masculinized females were smaller and less fecund than 2009 non-masculinized females in both populations. Moreover, 2008 males were smaller, had shorter gonopodia, and smaller testes than 2009 males. Our results support the hypothesis that female masculinization can have a strong influence on reproductive life history and population dynamics of livebearing fishes.

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Acknowledgments

We thank Sibyl Bucheli for microscope use and Sarah Marshall, Stacy Stoops, and Justin Degrate for field assistance. We also thank Chad Hargrave for field assistance, fish samples, and use of laboratory equipment. All fish were collected with permission of Texas Parks and Wildlife (permit SPR-0607-1370 to R Deaton) and approval of the Institutional Animal Care and Use Committee at Sam Houston State University (# 07-01-31-1012-3-01 to R Deaton).

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Correspondence to Raelynn Deaton.

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Deaton, R., Cureton, J.C. Female masculinization and reproductive life history in the western mosquitofish (Gambusia affinis). Environ Biol Fish 92, 551–558 (2011). https://doi.org/10.1007/s10641-011-9878-z

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  • DOI: https://doi.org/10.1007/s10641-011-9878-z

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