On the origin of Lake Malawi cichlids and mechanisms of their maintenance.

dc.contributor.advisorDanley, Patrick D.
dc.creatorDing, Baoqing.
dc.date.accessioned2015-03-18T16:07:08Z
dc.date.available2015-03-18T16:07:08Z
dc.date.created2014-12
dc.date.issued2014-10-28
dc.date.submittedDecember 2014
dc.date.updated2015-03-18T16:07:08Z
dc.description.abstractA fundamental task of evolutionary biology is to explore patterns of speciation. Evolutionary biologists have been intrigued for centuries by the fact that some species underwent extensive radiation while others diversified little. Speciation rates can be influenced by both ecological and lineage specific factors. However, a comprehensive understanding of how these factors operate on speciation is limited. Speciose communities, like the cichlids in the East African Great Lakes, offer unique opportunities to examine these factors. In this study I integrated ecological, behavioral and evolutionary genetics to investigate the mechanisms that govern the speciation and coexistence of Lake Malawi cichlids. First, I examined the genetic architecture of male coloration and female mate choice through quantitative genetic analyses. This study revealed that 1) male color pattern is polygenic, 2) female mate choice, however, may be controlled by a small number of genes. Furthermore, a joint analysis of color pattern and female mate choice suggests that genetic linkage between these two traits is unlikely. However, the simple genetic architecture of female mate choice can only partially explain the cichlids speciation. By testing the role of Prostaglandin F2α (PG) in cichlid female mate choice, I found that female mate choice can be invoked by the administration of PG. The molecular genetic mechanism of cichlids speciation was investigated through quantitative genetic mapping. I identified several putative quantitative trait loci (QTL) controlling male color pattern. Interestingly, genes that control the color of male body bar and pelvic fin seemed to be a pair of paralogs. However, I was unable to identify the loci associated with female mate choice. Finally, ecological mechanism of species coexistence was investigated. I found that habitat complexity predicts species and functional diversity of the cichlids communities: a higher rugosity allowed more species and functional groups to coexist.
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2104/9236
dc.language.isoen
dc.rights.accessrightsWorldwide access.en_US
dc.rights.accessrightsAccess changed 5/23/17.
dc.subjectSpeciation. Cichlids. Color pattern, mate choice. Gene duplication. Habitat complexity. Sexual hormone.
dc.titleOn the origin of Lake Malawi cichlids and mechanisms of their maintenance.
dc.typeThesis
dc.type.materialtext
local.embargo.lift2016-12-01
local.embargo.terms2016-12-01
thesis.degree.departmentBaylor University. Dept. of Biology.
thesis.degree.grantorBaylor University
thesis.degree.levelDoctoral
thesis.degree.namePh.D.

Files

Original bundle

Now showing 1 - 4 of 4
Loading...
Thumbnail Image
Name:
DING-DISSERTATION-2014.pdf
Size:
1.78 MB
Format:
Adobe Portable Document Format
No Thumbnail Available
Name:
Baoqing_Ding_copyrightandavailabilityform.pdf
Size:
238.72 KB
Format:
Adobe Portable Document Format
No Thumbnail Available
Name:
Baoqing_Ding_signaturepage.pdf
Size:
50.46 KB
Format:
Adobe Portable Document Format
No Thumbnail Available
Name:
Baoqimg_jDing_Copyright Permissions_chp5.pdf
Size:
229.58 KB
Format:
Adobe Portable Document Format

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
LICENSE.txt
Size:
1.95 KB
Format:
Plain Text
Description: