Effect of altitude on the sex ratio in populations of Silene acaulis (Caryophyllaceae)

Alatalo, J. M. & Molau, U. 1995. Effect of altitude on the sex ratio in populations of Silene acaulis. — Nord. J. Bot. 15: 251–256. Copenhagen. ISSN 0107–055X. Predicted increase of female frequencies in gynodioecious Silene acaulis was tested along an altitude gradient in northern Sweden. Avera...

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Bibliographic Details
Published in:Nordic Journal of Botany
Main Authors: Alatalo, Juha M., Molau, Ulf
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1995
Subjects:
Plant Science
Ecology, Evolution, Behavior and Systematics
Alatalo
Northern Sweden
Silene acaulis
Online Access:http://dx.doi.org/10.1111/j.1756-1051.1995.tb00150.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1756-1051.1995.tb00150.x
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Summary:Alatalo, J. M. & Molau, U. 1995. Effect of altitude on the sex ratio in populations of Silene acaulis. — Nord. J. Bot. 15: 251–256. Copenhagen. ISSN 0107–055X. Predicted increase of female frequencies in gynodioecious Silene acaulis was tested along an altitude gradient in northern Sweden. Average female frequencies for the four sites increased with altitude from 42% to 59% within a short geographical distance. This follows the outcrossing hypothesis, that female frequencies should be positively correlated with selfing rates of hermaphrodites in populations. More adverse environmental conditions should favour gynodioecy in areas where reproduction to a greater part relies on vegetative reproduction or selfing. Further, a significant difference in corolla width was found between females and the larger hermaphrodites, but not between sites. Cushion size and the number of flowers per cushion decreased with attitude.

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