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• W2149133395 endingPage "945" @default.
• W2149133395 startingPage "935" @default.
• W2149133395 abstract "• Premise of the study: Contact zones between polyploids and their diploid progenitors may provide important insights into the mechanisms of sympatric speciation and local adaptation. However, most published studies investigated secondary contact zones where the effects of genome duplication can be confounded by previous independent evolution of currently sympatric cytotypes. We compared genetically close diploid and autotetraploid serpentine cytotypes of Knautia arvensis (Caprifoliaceae) in a primary contact zone and evaluated the role of adaptive and nonadaptive processes for cytotype coexistence. • Methods: DNA flow cytometry was used to determine ploidy distribution at various spatial scales (from across the entire contact zone to microgeographic). Habitat preferences of diploids and polyploids were assessed by comparing vegetation composition of nearby ploidy‐uniform sites and by recording plant species immediately surrounding both cytotypes in mixed‐ploidy plots. • Key results: Tetraploids considerably outnumbered their diploid progenitors in the contact zone. Both cytotypes were segregated at all investigated spatial scales. This pattern was not driven by ecological shifts, because both diploids and tetraploids inhabited sites with nearly identical vegetation cover. Certain interploidy niche differentiation was indicated only at the smallest spatial scale; ecologically nonadaptive processes were most likely responsible for this difference. • Conclusions: We conclude that a shift in ecological preferences (i.e., the adaptive scenario) is not necessary for the establishment and evolutionary success of autopolyploid derivatives in primary contact zones. Spatial segregation that would support ploidy coexistence can also be achieved by ecologically nonadaptive processes, including the founder effect, limited dispersal ability, intense clonal growth, and triploid block." @default.
• W2149133395 created "2016-06-24" @default.
• W2149133395 creator A5035571610 @default.
• W2149133395 creator A5040482576 @default.
• W2149133395 creator A5055529522 @default.
• W2149133395 creator A5088230829 @default.
• W2149133395 date "2014-06-01" @default.
• W2149133395 modified "2023-10-07" @default.
• W2149133395 title "Nonadaptive processes governing early stages of polyploid evolution: Insights from a primary contact zone of relict serpentine <i>Knautia arvensis</i> (Caprifoliaceae)" @default.
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• W2149133395 doi "https://doi.org/10.3732/ajb.1400005" @default.
• W2149133395 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24920762" @default.
• W2149133395 hasPublicationYear "2014" @default.
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