Translocation precipitates natural hybridisation and pervasive introgression between marine gastropods with divergent developmental modes

Assisted colonisation, the introduction of species beyond their historical range, is increasingly necessary for conserving species. However, empirical evidence of the long-term genetic outcomes of assisted colonisation is grossly lacking. A risk associated with moving species beyond their native range is the possibility of interspecific hybridisation with a closely related species, potentially resulting in outbreeding depression or the genetic swamping of a parental species. Here, we use a combination of genome-wide Single Nucleotide Polymorphism (SNP) markers and mitochondrial DNA sequencing to determine the long-term genetic consequences of introducing the intertidal periwinkle Bembicium vittatum (a direct developer) beyond its native range and into the native range of its congener Bembicium auratum (a species with planktotrophic larval dispersal). We found novel evidence of natural, multigenerational hybridisation between marine invertebrates with different modes of development. I..., , , # Translocation precipitates natural hybridisation and pervasive introgression between marine gastropods with divergent developmental modes

[https://doi.org/10.5061/dryad.g4f4qrfz4](https://doi.org/10.5061/dryad.g4f4qrfz4)

## Description of the data and file structure

\"Report_DBemb21-6115_2_SNP_mapping_2.csv\" contains raw SNP genotype data generated by Diversity Arrays Technology for each individual used in the study. Each allele is scored in binary fashion (\"1\"=Presence and \"0\"=Absence) and heterozygotes are scored as 1/1 (presence for both alleles/both rows).

Locus metatdata is also contained in this file (generated by DArT) including allele identification (AlleleID), the seaquence of each allele (AlleleSequence), average count of the reference (AvgCountRef) and SNP allele (AvgCountSnp), average polymorphism content of each locus (AvgPIC), locus call rate (CallRate), a unique identifier for the sequence that each SNP occurs in (CloneID), the proportion of samples scored as heteroz...