Population differentiation of Southern Ocean seabirds

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dc.contributor.authorAbeyrama, Dilini Kanachana
dc.contributor.authorUniversity of Lethbridge. Faculty of Arts and Science
dc.contributor.supervisorBurg, Theresa M.
dc.date.accessioned2023-06-29T19:11:47Z
dc.date.available2023-06-29T19:11:47Z
dc.date.issued2024
dc.degree.levelPh.D
dc.description.abstractThe Southern Ocean is a remote but unique ecosystem with high winds, strong currents, and a handful of islands surrounding the Antarctic continent. Reduced gene flow due to these physical and non-physical barriers supports rapid evolution and endemism within the Southern Ocean. Seabirds are a good model to study barrier-mediated speciation as they face a limited number of physical barriers, yet they are a highly diversified group. In my thesis, I used molecular markers to study population differentiation in five Southern Ocean seabird species at the three levels: among ocean basins, within oceans and within a single island. Sooty albatross (Phoebetria fusca) and yellow-nosed albatross showed population differentiation between Atlantic and Indian Ocean basins. Two sister species of yellow-nosed albatross, Atlantic (Thalassarche chlororhynchos) and Indian (Thalassarche carteri), both showed population genetic structure within Atlantic and Indian Oceans, respectively. The other two study species, Kerguelen shags (Phalacrocorax verrucosus) and gentoo penguins (Pygoscelis papua) breeding on Kerguelen Island, showed genetic structure among different breeding colonies of each species on the same island. Non-physical barriers such as natal philopatry and at-sea distribution, are limiting gene flow in the Southern Ocean at different geographic scales.
dc.description.sponsorshipNSERC Discovery Grant Alberta Innovates- Tech Futures Alberta Society of Professional Biologists The Seabird Group Mitacs Research Training Award French Polar Institute (Institut polaire français Paul-Émile-Victor)
dc.identifier.urihttps://hdl.handle.net/10133/6510
dc.language.isoen
dc.proquestyesNo
dc.publisherLethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences
dc.publisher.departmentDepartment of Biological Sciences
dc.publisher.facultyArts and Science
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)
dc.subjectpopulation differentiation
dc.subjectSouthern Ocean seabirds
dc.subjectgene flow
dc.subjectbarrier-mediated speciation
dc.subjectmolecular markers
dc.subject.lcshSea birds--Research--Antarctic Ocean
dc.subject.lcshGene flow--Research
dc.subject.lcshPhoebetria--Genetics--Research--Antarctic Ocean
dc.subject.lcshPhoebetria--Speciation--Research--Antarctic Ocean
dc.subject.lcshPhoebetria--Molecular genetics--Research--Antarctic Ocean
dc.subject.lcshGray-headed albatross--Genetics--Research--Antarctic Ocean
dc.subject.lcshGray-headed albatross--Speciation--Research--Antarctic Ocean
dc.subject.lcshGray-headed albatross--Molecular genetics--Research--Antarctic Ocean
dc.subject.lcshGentoo penguin--Genetics--Research--Kerguelen Island
dc.subject.lcshGentoo penguin--Speciation--Research--Kerguelen Island
dc.subject.lcshGentoo penguin--Molecular genetics--Research--Kerguelen Island
dc.subject.lcshShag (Bird)--Genetics--Research--Kerguelen Island
dc.subject.lcshShag (Bird)--Speciation--Research--Kerguelen Island
dc.subject.lcshShag (Bird)--Molecular genetics--Research--Kerguelen Island
dc.subject.lcshEndemic birds--Antarctic Ocean
dc.subject.lcshDissertations, Academic
dc.titlePopulation differentiation of Southern Ocean seabirds
dc.typeThesis
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