On the evolution of distyly and morph ratio distortion in Lithospermum caroliniense
dc.contributor.author | Ladd, Cody | |
dc.contributor.author | Llamas, Miriam | |
dc.contributor.advisor | Price, Jordan | |
dc.date.accessioned | 2019-02-14T20:39:31Z | |
dc.date.available | 2019-02-14T20:39:31Z | |
dc.date.issued | 2018 | |
dc.identifier.uri | https://hdl.handle.net/2027.42/147898 | |
dc.description | Natural History and Evolution | |
dc.description.abstract | Two conflicting models presently exist describing the evolutionary history of heterostyly, a condition in which there presents two morphs -- different plant sexual organ structure that some individuals within the same species exhibit as a means of promoting outcrossing. The charlesworth model (1979) and the Lloyd-Webb model (1992) differ in that the latter assumes the ancestral character state was one of approach herkogamy, whereas the former assumes it was homostyly. One such heterostylic species, Lithospermum caroliniense (Walt.) MacMill. (Boraginaceae), is unique in that it additionally exhibits morph ratio distortion, that is, in natural populations, one morph is disproportionately represented over the other morph, which is of particular interest because inverse frequency dependent selection should presumably shape a 1:1 morph ratio. In this paper, we discuss the Levin (1968) model of morph ratio distortion in L. caroliniense, and propose the superthrum model, in which we hypothesize the existence of superthrums, a genetically unique form of the thrum morph that, after 5 generations, produces distortion to the degree recorded by several field studies (Cartmill and Murray 2011; Levin 1968; Levin 1972). | |
dc.title | On the evolution of distyly and morph ratio distortion in Lithospermum caroliniense | |
dc.type | Working Paper | |
dc.subject.hlbsecondlevel | Natural Resources and Environment | |
dc.subject.hlbtoplevel | Science | |
dc.contributor.affiliationumcampus | Ann Arbor | |
dc.description.bitstreamurl | https://deepblue.lib.umich.edu/bitstream/2027.42/147898/1/Ladd_Llamas_2018.pdf | |
dc.owningcollname | Biological Station, University of Michigan (UMBS) |
Files in this item
Remediation of Harmful Language
The University of Michigan Library aims to describe library materials in a way that respects the people and communities who create, use, and are represented in our collections. Report harmful or offensive language in catalog records, finding aids, or elsewhere in our collections anonymously through our metadata feedback form. More information at Remediation of Harmful Language.
Accessibility
If you are unable to use this file in its current format, please select the Contact Us link and we can modify it to make it more accessible to you.