10.5061/DRYAD.63DR0
Bouchemousse, Sarah
French National Centre for Scientific Research
Liautard-Haag, Cathy
Sorbonne University
Bierne, Nicolas
University of Montpellier
Viard, Frédérique
French National Centre for Scientific Research
Data from: Distinguishing contemporary hybridization from past
introgression with postgenomic ancestry-informative SNPs in strongly
differentiated Ciona species
Dryad
dataset
2016
secondary contacts
Ciona robusta
Ciona intestinalis
contemporary hybridization
tunicates
past introgression
2016-09-22T13:10:45Z
2016-09-22T13:10:45Z
en
https://doi.org/10.1111/mec.13854
433495 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Biological introductions bring into contact species that can still
hybridize. The evolutionary outcomes of such secondary contacts may be
diverse (e.g. adaptive introgression from or into the introduced species)
but are not yet well examined in the wild. The recent secondary contact
between the non-native sea squirt Ciona robusta (formerly known as C.
intestinalis type A) and its native congener C. intestinalis (formerly
known as C. intestinalis type B), in the Western English Channel, provides
an excellent case study to examine. To examine contemporary hybridization
between the two species, we developed a panel of 310 ancestry-informative
SNPs from a population transcriptomic study. Hybridization rates were
examined on 449 individuals sampled in eight sites from the sympatric
range and five sites from allopatric ranges. The results clearly showed an
almost complete absence of contemporary hybridization between the two
species in syntopic localities, with only one-first-generation hybrid and
no other genotype compatible with recent backcrosses. Despite the almost
lack of contemporary hybridization, shared polymorphisms were observed in
sympatric and allopatric populations of both species. Furthermore, one
allopatric population from SE Pacific exhibited a higher rate of shared
polymorphisms compared to all other C. robusta populations. Altogether,
these results indicate that the observed level of shared polymorphism is
more probably the outcome of ancient gene flow spread afterwards at a
worldwide scale. They also emphasize efficient reproductive barriers
preventing hybridization between introduced and native species, which
suggests hybridization should not impede too much the expansion and the
establishment of the non-native species in its introduction range.
Full dataset 310 SNPsFull dataset of the 310 SNPs using to investigate
contemporary hybridization and introgression patterns between two Ciona
species (Ciona robusta and Ciona intestinalis). The file contains the
genotype of the 451 individuals studied (213 of C. robusta, 236 of C.
intestinalis and 2 F1 hybrids from experimental crosses; note that the
natural F1 hybrid found in our study is included in the 236 individuals of
C. intestinalis). The file contains also informations on the 310 SNPs
(chromosome number, exact nucleotide position along chromosomes and
category of polymorphism).Datafile_CrobCint_310SNPs.xlsx
NE Atlantic (English Channel South of Brittany)
NW Atlantic (USA)
SE Pacific (Chile)
North Sea (Sweden)
Mediterranean Sea