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  • A Tale of Two Islands: Long Distance Dispersal to Oceanic Islands and the Influence of Dispersal Potential on Large-Scale Phylogeographic Patterns

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    Cottle_2014_02Thesis.pdf (7.210Mb)
    Author(s)
    Cottle, Ceaira
    Primary Supervisor
    Hughes, Jane
    Other Supervisors
    Schmidt, Daniel
    Page, Timothy
    Year published
    2014
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    Abstract
    Comparative phylogeography seeks to compare phylogeographic patterns of multiple co-distributed species in order to examine levels of temporal and spatial congruence. Comparative assessments can lead to reconstructions of major trends in the recent histories of dispersal of a region and can provide significant advances in understanding how behaviour, demography and natural histories of species and populations can influence phylogeographic patterns. When common spatial patterns of evolutionary sub-division are found between co-distributed species they are thought to share a biogeographic history. Although concordant phylogeographic ...
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    Comparative phylogeography seeks to compare phylogeographic patterns of multiple co-distributed species in order to examine levels of temporal and spatial congruence. Comparative assessments can lead to reconstructions of major trends in the recent histories of dispersal of a region and can provide significant advances in understanding how behaviour, demography and natural histories of species and populations can influence phylogeographic patterns. When common spatial patterns of evolutionary sub-division are found between co-distributed species they are thought to share a biogeographic history. Although concordant phylogeographic patterns have been found across multiple taxa, not all comparative phylogeographic studies have found evidence of congruence. The influence of dispersal potential on the phylogeographic structuring of multiple co-distributed species was the main focus of this thesis. The main goal was to explore how dispersal potential, based on life history characteristics, influenced phylogeographic structure on a large-scale in multiple co-distributed species, and in particular how this influenced oceanic island populations. Whilst there are disagreements in the biogeographic literature as to whether vicariant or dispersal processes best explain the geographic distribution of a species, the colonisation and accumulation of biotic assemblages on oceanic islands is unequivocally the result of transoceanic dispersal. The biotic communities present on oceanic islands therefore inevitably consist of species that are able to disperse well. Genetic variation within island populations is directly influenced by the dispersal potential of the species in question. Species that disperse frequently will be more closely related to the source population due to continual migration to the islands from mainland (or other island) sources; whereas species that do not disperse as often will be more genetically distinct and divergent from the source population.
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    Thesis Type
    Thesis (PhD Doctorate)
    Degree Program
    Doctor of Philosophy (PhD)
    School
    Griffith School of Environment
    DOI
    https://doi.org/10.25904/1912/828
    Copyright Statement
    The author owns the copyright in this thesis, unless stated otherwise.
    Item Access Status
    Public
    Subject
    Phylogeography
    Dispersal of species, Tasman Sea
    Phylogeography, Lord Howe Island
    Phylogeography, Norfolk Island
    Publication URI
    http://hdl.handle.net/10072/367140
    Collection
    • Theses - Higher Degree by Research

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