Plasticity and selection of male sexual traits across operational sex ratios in Japanese medaka (Oryzias latipes)

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dc.contributor.advisor Weir, Laura K.
dc.creator Allen, Emily R.
dc.date.accessioned 2019-10-16T13:49:05Z
dc.date.available 2019-10-16T13:49:05Z
dc.date.issued 2019
dc.identifier.other QL638 O78 A45 2019
dc.identifier.uri http://library2.smu.ca/handle/01/29125
dc.description vi, 76 leaves : illustrations ; 29 cm
dc.description Includes abstract.
dc.description Includes bibliographical references (leaves 59-66).
dc.description.abstract In many species, the mating advantage associated with sexually-selected traits may vary with operational sex ratio (OSR; the number of sexually active males to fertilizable females in a population), and this metric is often used as a proxy for the intensity of competition for mates. The goal of this research was to assess whether OSR influenced male mating behaviour and morphology of sexually-selected traits. I examined these effects both intra- and inter-generationally by housing Japanese medaka (Oryzias latipes) in four different OSRs ranging from female-biased to highly male-biased. I found that: (1) courtship behaviour decreased and aggression tended to increase with increasing OSR, and male body size was the best predictor of aggression; (2) there is plasticity in mating behaviour, particularly courtship; (3) within males, larger primary and secondary sexual structures occurred in female-biased OSRs; and (4) overall levels of courtship and aggression were higher after one generation within OSRs. en_CA
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dc.description.provenance Made available in DSpace on 2019-10-16T13:49:05Z (GMT). No. of bitstreams: 1 Allen_Emily_MASTERS_2019.pdf: 2367424 bytes, checksum: 1873896e8cb6f3a064ce83a238641a77 (MD5) Previous issue date: 2019-08-13 en
dc.language.iso en en_CA
dc.publisher Halifax, N.S. : Saint Mary's University
dc.subject.lcc QL638.O78
dc.subject.lcsh Oryzias latipes -- Sexual behavior
dc.subject.lcsh Oryzias latipes -- Morphology
dc.subject.lcsh Sexual selection in animals
dc.subject.lcsh Fishes -- Sex ratio
dc.title Plasticity and selection of male sexual traits across operational sex ratios in Japanese medaka (Oryzias latipes) en_CA
dc.type Text en_CA
thesis.degree.name Master of Science in Applied Science
thesis.degree.level Masters
thesis.degree.discipline Biology
thesis.degree.grantor Saint Mary's University (Halifax, N.S.)
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