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Examining the Relative Lifetime Fitnesses for Alternative Mating Phenotypes in Xiphophorus multilineatus

Bono, Lisa M.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1249418078

Abstract Details

2009, Master of Science (MS), Ohio University, Biological Sciences (Arts and Sciences).
Males of the high-back pygmy swordtail Xiphophorus multilineatus display genetically-influenced alternative mating phenotypes. Evolutionary game theory predicts that genetically-influenced alternative phenotypes are maintained at equal fitnesses by negative frequency-dependent selection. I measured age at sexual maturity of the phenotypes and then used this estimate along with an estimate of the relative fertilization success to test the prediction of equal fitnesses. My results demonstrate that the size difference between sneakers and courters is due to differences in the age to sexual maturity. However, the advantages of reaching sexual maturity sooner for sneaker males did not compensate for the higher fertilization success of courter males. Using a model, I demonstrate that the alternative phenotypes did not have equal fitnesses when the frequency of sneakers was high, but preliminary evidence suggests that negative frequency-dependent selection may be maintaining the alternative phenotypes.
Molly R. Morris, PhD (Advisor)
Oscar Rios-Cardenas, PhD (Advisor)
Matthew M. White, PhD (Committee Member)
61 p.
Behaviorial Sciences; Biology; Ecology; Zoology
Xiphophorus multilineatus; alternative mating phenotypes; frequency-dependent selection; ESSt

Recommended Citations

Citations

  • Bono, L. M. (2009). Examining the Relative Lifetime Fitnesses for Alternative Mating Phenotypes in Xiphophorus multilineatus [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1249418078

    APA Style (7th edition)

  • Bono, Lisa. Examining the Relative Lifetime Fitnesses for Alternative Mating Phenotypes in Xiphophorus multilineatus. 2009. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1249418078.

    MLA Style (8th edition)

  • Bono, Lisa. "Examining the Relative Lifetime Fitnesses for Alternative Mating Phenotypes in Xiphophorus multilineatus." Master's thesis, Ohio University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1249418078

    Chicago Manual of Style (17th edition)

ohiou1249418078
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© 2009, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.