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- W3048736091 abstract "When differentiated lineages come into contact, their fates depend on demographic and reproductive factors. These factors have been well‐studied in taxa of the same ploidy, but less is known about sympatric lineages that differ in ploidy, particularly with respect to demographic factors. We assessed prezygotic, postzygotic, and total reproductive isolation in naturally pollinated arrays of diploid‐tetraploid and tetraploid‐hexaploid population mixes of Campanula rotundifolia by measuring pollinator transitions, seed yield, germination rate, and proportion of hybrid offspring. Four frequencies of each cytotype were tested, and pollinators consistently overvisited rare cytotypes. Seed yield and F1 hybrid production were greater in 4X‐6X arrays than 2X‐4X arrays, whereas germination rates were similar, creating two distinct patterns of reproductive isolation. In 2X‐4X arrays, postzygotic isolation was near complete (3% hybrid offspring), and prezygotic isolation associated with pollinator preference is expected to facilitate the persistence of minority cytotypes. However, in 4X‐6X arrays where postzygotic isolation permitted hybrid formation (44% hybrids), pollinator behavior drove patterns of reproductive isolation, with rare cytotypes being more isolated and greater gene flow expected from rare into common cytotypes. In polyploid complexes, both the specific cytotypes in contact and local cytotype frequency, likely reflecting spatial demography, will influence likelihood of gene exchange." @default.
- W3048736091 created "2020-08-18" @default.
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- W3048736091 date "2020-09-03" @default.
- W3048736091 modified "2023-10-16" @default.
- W3048736091 title "Strength in numbers? Cytotype frequency mediates effect of reproductive barriers in mixed‐ploidy arrays" @default.
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- W3048736091 doi "https://doi.org/10.1111/evo.14077" @default.
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