The abstract is read at the publisher; the summary is JClub's.
A 9-year genomic time series in a tsunami-induced hybrid stickleback population in Japan shows rapid genome-wide purging within only a few generations, despite extensive introgression.
- Why it matters: Real-time genomic observations of how introgressed DNA is removed in nature are rare, limiting understanding of how species identity persists as hybridization occurs.
- What they did: After the 11 March 2011 Tohoku tsunami created new habitats and hybridization between Gasterosteus aculeatus and Gasterosteus nipponicus, the authors monitored allele frequencies for 9 years and tracked purging at reproductive-isolation loci.
- The result: Within the first few generations, G. nipponicus alleles were purged at major reproductive-isolation loci (including ancestral-X and neo-X), and later purged across the genome except at several loci, supporting persistence of species identity.
The findingWhy it mattersWhat they didThe result
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