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Supervised by
Dr. Stephen Rossiter (QMUL) and Dr. James Cotton (Wellcome Trust
Sanger Institute).
In collaboration with Dr. Shiang-Fan Chen (Providence University,
Taiwan) and Dr. Yin-Ping Fang (National Chiayi University, Taiwan).
Funded with
grants awarded by Central Research Fund (CRF, University of London)
and Taiwan National Science Council.
For my PhD, I am studying
the tempo and mode of taxonomic diversification at multiple hierarchical
levels, focusing on several groups of bats.
At a micro-evolutionary
scale, I am comparing range-wide genetic structure among endemic
Taiwanese bat species of the genera Kerivoula, Murina,
Myotis and Rhinolophus. One of my aims is to determine
to what extent common physical and/or biological factors have led
to concordant patterns of population genetic structure in these
bats. My study animals include lowland species, highland species,
and species that range across all altitudes, and I therefore predict
that they will have been differentially impacted by Taiwan’s
dramatic topography, containing huge altitudinal changes over very
short geographic distance (0 to 3000 metres in 70 kilometers).
I am also focusing
on the processes that have led to speciation between Murina
gracilis and M. recondita, which were reported as
new species in 2009. A pilot phylogenetic study showed they are
probably sister species, suggesting that they diverged from each
other within Taiwan. This represents an unusual system, as some
experts have suggested that the occurrence of sister species of
mobile animals having limited co-distributions (as is the case of
these Murina spp.) represents potential evidence for the
occurrence of non-allopatric speciation. To investigate non-allopatric
speciation, I am using “isolation-with-migration” models
to test on the occurrance of historical gene flow between these
species during their divergence. Detection of such gene flow in
this special system would add credence that these species initially
diverged from each other non-allopatrically.
At a macro-evolutionary
scale, I am interested in the factors influencing the tempo and
pattern of radiation within large clades of bats. For this, I am
constructing dated phylogenies to determine diversification rates
and relating my results to environmental factors, biological factors,
or interactions between these.
I hope all these different
approaches will offer new insights into the processes of speciation
and diversification in bats and other groups.
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