Exploring the Costs and Benefits of Self-Fertilization and Sex Change in Kryptolebias Marmoratus.

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dc.contributor Lozier, Jeffrey
dc.contributor Atkinson, Carla
dc.contributor Cherry, Julia
dc.contributor Tatarenkov, Andrei
dc.contributor.advisor Earley, Ryan L
dc.contributor.author Gresham, Jennifer Durham
dc.date.accessioned 2022-04-13T20:34:12Z
dc.date.available 2027-09-01
dc.date.issued 2020
dc.identifier.other http://purl.lib.ua.edu/182102
dc.identifier.other u0015_0000001_0004255
dc.identifier.other Gresham_alatus_0004D_14242
dc.identifier.uri https://ir.ua.edu/handle/123456789/8434
dc.description Electronic Thesis or Dissertation
dc.description.abstract Most eukaryotic organisms engage in sexual reproduction where gametes from two separate individuals of opposite sexes must fuse for fertilization (outcrossing). Despite the prevalence of this reproductive strategy, theoretical modeling for the last sixty years has suggested that sexual reproduction should be difficult to sustain over evolutionary time. How outcrossing is maintained has been a key question in the field of evolutionary biology for over a century. Mixed mating populations exploit the benefits of both outcrossing and self-fertilizing one’s own eggs (selfing), while reducing the costs associated with both reproduction strategies. An additional cost of outcrossing is the ‘cost of males.’ Males are viewed as costly because, compared to asexual or selfing individuals, males cannot contribute offspring and they reduce the parent’s genetic contribution to offspring by one half. I explored the costs and benefits of selfing and males in the mangrove rivulus fish Kryptolebias marmoratus. Mangrove rivulus populations offer an exemplary opportunity to study mixed mating and the cost of males; populations are made up of selfing hermaphrodites and males (androdioecy). Males are the result of sex change from hermaphrodites and can externally outcross with unfertilized eggs oviposited by hermaphrodites. I discovered males are significantly more likely to survive ecological conditions than hermaphrodites. I provide evidence of outbreeding depression in reproductive traits, and an association between reproductive fitness and the likelihood that a given genotype will change sex. Finally, I report the results of male mate choice among hermaphrodites of different ages; an experiment designed to understand how males might find unfertilized eggs.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other androdioecy
dc.subject.other Kryptolebias marmoratus
dc.subject.other lineage variation
dc.subject.other mate choice
dc.subject.other sex allocation
dc.subject.other sex change
dc.title Exploring the Costs and Benefits of Self-Fertilization and Sex Change in Kryptolebias Marmoratus.
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Department of Biological Sciences
etdms.degree.discipline Biology
etdms.degree.grantor The University of Alabama
etdms.degree.level doctoral
etdms.degree.name Ph.D.


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