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dc.contributor.authorMartiskainen, Henna
dc.date.accessioned2011-06-28T11:38:04Z
dc.date.available2011-06-28T11:38:04Z
dc.date.issued2011
dc.identifier.otheroai:jykdok.linneanet.fi:1163743
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/27236
dc.description.abstractNatural selection theory predicts low variance in traits closely related to reproductive success, since the most fit trait value should replace all the others. However, a considerable amount of variation is found in life-history traits throughout the animal kingdom. The most widely accepted mechanism maintaining this variation is a balance between mutation and selection; however, observed variance is higher than predicted by mutation – selection balance alone and thus additional processes must be involved. One possible mechanism which has only recently started to gain attention is intralocus sexual conflict, where the optima of fitness related traits are sex dependent. This leads to sexually antagonistic variation in life-history traits, especially those related to reproduction where the sexes diverge most. Intralocus conflict alone might only be able to slow down the depletion of variation, but become really powerful when combined with negative frequency-dependent selection, which favors the rare morphs in the population. In my master ‟s thesis I investigate the interaction between these two selective forces, sexually antagonistic selection and frequency-dependent selection, and their potential to maintain variation in life- history traits. Bank voles (Myodes glareolus) were artificially selected in the laboratory according to sexually antagonistic selection to create two lines with opposing reproductive success (high-dominance males with low- fecundity sisters and vice versa). I found a significant difference between the lines in male dominance in behavioral laboratory trials and plasma testosterone levels. The frequency of these two lines was then manipulated in semi- natural field enclosures to be either rare or common in the population. Reproductive success was measured by observing female litter size and determining male siring success with genetic paternity analysis. Reproductive success of males in the field was negatively frequency-dependent regardless of their selected dominance status, whereas in females only the selected fecundity status explained their reproductive success. The results of my thesis suggest that the negative frequency-dependence experienced by male bank voles could maintain sexually antagonistic variation in this species by a cyclic fluctuation in the frequency of the different (male) tactics.
dc.format.extent23 sivua
dc.language.isoeng
dc.rightsThis publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.en
dc.rightsJulkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.fi
dc.subject.otherlokuksensisäinen seksuaalikonflikti
dc.subject.othermetsämyyrä (Myodes glareolus)
dc.subject.othermikrosatelliitit
dc.subject.othermuuntelun säilyminen
dc.subject.otherseksuaalisesti antagonistinen valinta
dc.subject.othertasapainottava valinta
dc.titleThe maintenance of sexually antagonistic variation in reproductive success by negative frequency-dependence in the bank vole (Myodes glareolus)
dc.identifier.urnURN:NBN:fi:jyu-2011062811066
dc.type.dcmitypeTexten
dc.type.ontasotPro gradufi
dc.type.ontasotMaster’s thesisen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Sciencesen
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosDepartment of Biological and Environmental Scienceen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineEkologia ja evoluutiobiologiafi
dc.contributor.oppiaineEcology and evolutionary biologyen
dc.rights.accesslevelopenAccessfi
dc.contributor.oppiainekoodi4011
dc.subject.ysometsämyyrä
dc.subject.ysomikrosatelliitit
dc.subject.ysomikrosatelliitit
dc.subject.ysogeneettinen muuntelu


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