Multigenerational hybridisation results in heterosis and facilitates adaptive introgression, with no evidence of outbreeding depression in a pair of marine gastropods

Anthropogenic environmental changes continue to threaten species globally. For example, translocation of species has caused unintentional hybridisation, which has contributed to species declines. On the other hand, hybridisation can be used to increase the evolutionary potential of species vulnerable to rapid environmental change, although the benefits of mixing genetically divergent lineages do not come without risks to individual fitness and the long-term viability of populations. Here, we use a combination of genome-wide Single Nucleotide Polymorphism (SNP) markers, mitochondrial DNA sequencing and measurements of growth rate to determine the genetic consequences of hybridisation between two congeneric marine gastropods across 27 years (~ 18 generations). Multigeneration hybridisation resulted from the introduction of the intertidal periwinkle Bembicium vittatum (a direct developer) into the native range of its congener Bembicium auratum (a species with planktotrophic larval dispersa..., , , # Multigenerational hybridisation results in heterosis and facilitates adaptive introgression, with no evidence of outbreeding depression in a pair of marine gastropods

## Description of the data and file structure

\"SNPdata_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). This SNP dataset matches the one published alongside our previous study ([https://doi.org/10.5061/dryad.g4f4qrfz4](https://doi.org/10.5061/dryad.g4f4qrfz4)).

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 id...