Morphometric variation in a hybrid zone between the weed, Silene vulgaris, and the endemic, Silene uniflora ssp petraea (Caryophyllaceae), on the Baltic island of Oland
Författare
Summary, in English
On the island of Oland the weed, Silene vulgaris (Moench) Garcke, and the endemic, Silene uniflora Roth ssp. petraea, hybridize when brought into contact by anthropogenic disturbance. Variation was studied in transects across a hybrid zone where a linear population of S. vulgaris crossed the native habitat of S. uniflora ssp. petraea. Plants were scored for 20 morphological characters. Although individual characters showed clinal trends between weed and endemic, all plants were assignable to one or other parental species. Only 14% of the 554 scored plants showed intermediacy in one or a few characters, and ordinations showed two separate groups of samples. The low number of intermediates is discussed in terms of character choice, habitat separation, disturbance history, and reproductive ecology. The results of the study are consistent with the earlier observation that the species have remained morphologically distinct on Oland, despite evidence of sparse introgression of allozymes from weed to endemic. Disturbance is necessary not only for the creation of intermediate (hybrid) habitats but also for the establishment of the weedy parent. The transient nature of S. vulgaris populations is likely to be important in limiting introgression into S. uniflora ssp. petraea under the present disturbance regime.
Avdelning/ar
Publiceringsår
2000
Språk
Engelska
Sidor
1384-1397
Publikation/Tidskrift/Serie
Canadian Journal of Botany
Volym
78
Issue
11
Fulltext
- Available as PDF - 438 kB
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Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Canadian Science Publishing, NRC Research Press
Ämne
- Ecology
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0008-4026