10.5061/DRYAD.4F4QRFJBN
Sendell-Price, Ashley
0000-0002-1227-8929
University of Oxford
Ruegg, Kristen
Colorado State University
Robertson, Bruce
University of Otago
Clegg, Sonya
University of Oxford
An island-hopping bird reveals how founder events shape genome-wide divergence
Dryad
dataset
2021
FOS: Biological sciences
2021-03-24T00:00:00Z
2021-03-24T00:00:00Z
en
661884171 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
When populations colonise new areas, both strong selection and strong
drift can be experienced due to novel environments and small founding
populations, respectively. Empirical studies have predominantly focused on
the phenotype when assessing the role of selection, and limited
neutral-loci when assessing founder-induced loss of diversity.
Consequently, the extent to which processes interact to influence
evolutionary trajectories is difficult to assess. Genomic-level approaches
provide the opportunity to simultaneously consider these processes. Here,
we examine the roles of selection and drift in shaping genomic diversity
and divergence in historically documented sequential island colonisations
by the silvereye bird (Zosterops lateralis). We provide the first
empirical demonstration of the rapid appearance of highly diverged genomic
regions following population founding, the position of which are highly
idiosyncratic. As these regions rarely contained loci putatively under
selection, it is most likely that these differences arise via the
stochastic nature of the founding process. However, selection is required
to explain rapid evolution of larger body size in insular silvereyes.
Reconciling our genomic data with these phenotypic patterns suggests there
may be many genomic routes to the island phenotype, that vary across
populations. Finally, we show that accelerated divergence associated with
multiple founding steps is the product of genome-wide rather than
localised differences, and that diversity erodes due to loss of rare
alleles. However even multiple founder events do not result in divergence
and diversity levels seen in evolutionary older subspecies, and therefore
do not provide a shortcut to speciation as proposed by founder-effect
speciation models.
This dataset contains VCF files and custom script required to assign SNPs
chromosomal positions (based on zebra finch assembly).