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Distribution, phenology and demography of sympatric sexual and asexual dandelions (Taraxacum officinale s.l.): geographic parthenogenesis on a small scale

Verduijn, M.H. and Dijk van, P.J. and Van Damme, J.M.M. (2004) Distribution, phenology and demography of sympatric sexual and asexual dandelions (Taraxacum officinale s.l.): geographic parthenogenesis on a small scale. Biological Journal of the Linnean Society, 82, 205-218. ISSN 0024-4066.

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Official URL: http://dx.doi.org/10.1111/j.1095-8312.2004.00325.x

Abstract

In many plant and animal species, sexual and asexual forms have different geographical distributions ('geographic parthenogenesis'). The common dandelion Taraxacum officinale s.l. provides a particularly clear example of differing distributions: diploid sexuals are restricted to southern and central Europe, while triploid asexuals occur across Europe. To get a better understanding of the factors underlying this pattern, we studied the distribution and demography of sexuals and asexuals in a mixed population that was located at the northern distribution limit of the sexuals. In this population three adjacent, contrasting microhabitats were found: a foreland and south and north slopes of a river dike. Comparative analyses of the distribution, phenology and demography indicated that sexuals had a stronger preference for the south slope than did asexuals. We therefore propose that the large-scale geographic parthenogenesis in T. officinale is shaped by an environmental gradient which acts upon the sexuals. [KEYWORDS: agamospermy; apomixis; flowering; microhabitat; polyploidy; triploidy]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11606
Deposited On:23 Nov 2011 01:00
Last Modified:31 Mar 2014 10:33

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