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Tracing the origin of Betonica officinalis in Sweden: RADseq suggests long-term persistence in southern (Scanian) populations

Dittmar, Tabea (2025) Systematikdagarna 2025 p.19-19
Abstract
The biogeographical origin of Betonica officinalis L. in Sweden has long been debated as to whether its populations represent natural postglacial relicts or human introductions. Using RADseq data from 42 individuals across 35 sites in 14 European countries, we analysed 9,598 SNPs to map genetic structure and infer relationships among regions. We found strong differentiation between western and central Europe. Southern Swedish samples formed a distinct, well-supported clade closely related to central European populations, with isolation by distance and reduced diversity suggesting long-term persistence. However, two Scanian localities fell outside this core group and showed clear signatures of human introduction, and another population near... (More)
The biogeographical origin of Betonica officinalis L. in Sweden has long been debated as to whether its populations represent natural postglacial relicts or human introductions. Using RADseq data from 42 individuals across 35 sites in 14 European countries, we analysed 9,598 SNPs to map genetic structure and infer relationships among regions. We found strong differentiation between western and central Europe. Southern Swedish samples formed a distinct, well-supported clade closely related to central European populations, with isolation by distance and reduced diversity suggesting long-term persistence. However, two Scanian localities fell outside this core group and showed clear signatures of human introduction, and another population near Stockholm was found to be genetically distinct and may represent a separate Baltic-related or introduced lineage. These results highlight complex colonization histories and the importance of understanding genetic structure for conservation. (Less)
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author
publishing date
type
Contribution to conference
publication status
published
subject
pages
1 pages
conference name
Systematikdagarna 2025
conference location
Stockholm, Sweden
conference dates
2025-11-24 - 2025-11-25
language
English
LU publication?
no
id
71e7fbaf-e10c-4a63-b8dc-02fb940ef6ec
date added to LUP
2025-11-26 14:52:19
date last changed
2025-12-03 17:01:50
@misc{71e7fbaf-e10c-4a63-b8dc-02fb940ef6ec,
  abstract     = {{The biogeographical origin of Betonica officinalis L. in Sweden has long been debated as to whether its populations represent natural postglacial relicts or human introductions. Using RADseq data from 42 individuals across 35 sites in 14 European countries, we analysed 9,598 SNPs to map genetic structure and infer relationships among regions. We found strong differentiation between western and central Europe. Southern Swedish samples formed a distinct, well-supported clade closely related to central European populations, with isolation by distance and reduced diversity suggesting long-term persistence. However, two Scanian localities fell outside this core group and showed clear signatures of human introduction, and another population near Stockholm was found to be genetically distinct and may represent a separate Baltic-related or introduced lineage. These results highlight complex colonization histories and the importance of understanding genetic structure for conservation.}},
  author       = {{Dittmar, Tabea}},
  language     = {{eng}},
  month        = {{11}},
  pages        = {{19--19}},
  title        = {{Tracing the origin of Betonica officinalis in Sweden: RADseq suggests long-term persistence in southern (Scanian) populations}},
  url          = {{https://lup.lub.lu.se/search/files/234018960/Systematikdagarna_2025_Abstract_Book.pdf}},
  year         = {{2025}},
}