Data for: Parallel recolonisations generate distinct genomic sectors in kelp following high magnitude earthquake disturbance

Large-scale disturbance events have the potential to drastically reshape
biodiversity patterns. Notably, newly vacant habitat space cleared by
disturbance can be colonised by multiple lineages, which can lead to the
evolution of distinct spatial ‘sectors’ of genetic diversity within a
species. We test for disturbance-driven sectoring of genetic diversity in
intertidal southern bull kelp, Durvillaea antarctica (Chamisso) Hariot
following the high-magnitude 1855 Wairarapa earthquake in New Zealand.
Specifically, we use genotyping-by-sequencing (GBS) to analyse fine-scale
population structure across the uplift zone to assess the fit of
alternative recolonisaton models. Our analysis reveals that specimens from
the uplift zone carry genomic signatures distinct from populations in
other regions, consistent with recolonisation after the 1855 earthquake.
Crucially, our analysis identifies two parapatric spatial-genomic sectors
of D. antarctica at Turakirae Head, which experienced the most dramatic
uplift. We infer that bull kelp in the Wellington region survived moderate
uplift and recolonised the devastated Turakirae Head coastline through two
parallel, eastward recolonisation events. By identifying multiple
parapatric genotypic sectors within a recently recolonised coastal region,
the current study confirms that competing lineage expansions can generate
striking spatial structuring of genetic diversity, even in highly
dispersive taxa.