10.5061/DRYAD.HDR7SQVJG
Bock, Dan
0000-0001-7788-1705
Washington University in Saint Louis
Baeckens, Simon
University of Antwerp
Pita-Aquino, Jessica
University of Rhode Island
Chejanovski, Zachary
University of Rhode Island
Michaelides, Sozos
Concordia University
Muralidhar, Pavitra
University of California, Davis
Lapiedra, Oriol
Centre for Ecological Research and Applied Forestries
Park, Sungdae
University of Georgia
Menke, Douglas
University of Georgia
Geneva, Anthony
Rutgers University
Losos, Jonathan
Washington University in Saint Louis
Kolbe, Jason
University of Rhode Island
Changes in selection pressure can facilitate hybridization during
biological invasion in a Cuban lizard
Dryad
dataset
2021
FOS: Biological sciences
Natural Sciences and Engineering Research Council
https://ror.org/01h531d29
502659
Natural Sciences and Engineering Research Council
https://ror.org/01h531d29
411730
National Science Foundation
https://ror.org/021nxhr62
IOS-1827647
National Science Foundation
https://ror.org/021nxhr62
DEB-1354897
John Templeton Foundation
https://ror.org/035tnyy05
52287
National Science Foundation
https://ror.org/021nxhr62
DEB-1927194
2021-10-08T00:00:00Z
2021-10-08T00:00:00Z
en
https://doi.org/10.5281/zenodo.5556025
1700385368 bytes
6
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Hybridization is among the evolutionary mechanisms most frequently
hypothesized to drive the success of invasive species, in part because
hybrids are common in invasive populations. One explanation for this
pattern is that biological invasions coincide with a change in selection
pressures that limit hybridization in the native range. To investigate
this possibility, we studied the introduction of the brown anole (Anolis
sagrei) in the southeastern United States. We find that native populations
are highly genetically structured. In contrast, all invasive populations
show evidence of hybridization among native-range lineages. Temporal
sampling in the invasive range spanning 15 years showed that invasive
genetic structure has stabilized, indicating that large-scale contemporary
gene flow is limited among invasive populations and that hybrid ancestry
is maintained. Additionally, our results are consistent with hybrid
persistence in invasive populations resulting from changes in natural
selection that occurred during invasion. Specifically, we identify a
large-effect X chromosome locus associated with variation in limb length,
a well-known adaptive trait in anoles, and show that this locus is often
under selection in the native range, but rarely so in the invasive range.
Moreover, we find that the effect size of alleles at this locus on limb
length is much reduced in hybrids among divergent lineages, consistent
with epistatic interactions. Thus, in the native range, epistasis
manifested in hybrids can strengthen extrinsic post-mating isolation.
Together, our findings show how a change in natural selection can
contribute to an increase in hybridization in invasive populations.
These data were obtained from multiple populations across the range of A.
sagrei (including Cuba, Bahamas, Florida and Southern Georgia), and
consist of genomic and morphological data. The genomic data were obtained
using double-digest RAD-seq. The VCF files included in this archive have
been filtered using methods described in Bock et al. (2021). The scripts
needed to perform these filtering steps are also included in the data
archive. The raw reads used at the beginning of the analyses have been
deposited on the NCBI SRA (accession numbers are given in Dataset S1 of
Bock et al. 2021). The morphological data (also included in Dataset S2 of
Bock et al. 2021) were obtained from X-ray images. The specimens used
to collect these morphological data along with associated X-ray
images have been deposited in the Herpetological Collection of the Harvard
Museum of Comparative Zoology (MCZ; museum identification codes are given
in Dataset S1 of Bock et al. 2021). Backup tail tip tissue for these
specimens is maintained in the cryogenic collection at MCZ.