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Darwin's wind hypothesis: does it work for plant dispersal in fragmented habitats?
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
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2009 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 183, no 3, 667-677 p.Article in journal (Refereed) Published
Abstract [en]

Using the wind-dispersed plant Mycelis muralis, we examined how landscape fragmentation affects variation in seed traits contributing to dispersal. Inverse terminal velocity () of field-collected achenes was used as a proxy for individual seed dispersal ability. We related this measure to different metrics of landscape connectivity, at two spatial scales: in a detailed analysis of eight landscapes in Spain and along a latitudinal gradient using 29 landscapes across three European regions. In the highly patchy Spanish landscapes, seed increased significantly with increasing connectivity. A common garden experiment suggested that differences in may be in part genetically based. The was also found to increase with landscape occupancy, a coarser measure of connectivity, on a much broader (European) scale. Finally, was found to increase along a south2013north latitudinal gradient. Our results for M. muralis are consistent with 'Darwin's wind dispersal hypothesis' that high cost of dispersal may select for lower dispersal ability in fragmented landscapes, as well as with the 'leading edge hypothesis' that most recently colonized populations harbour more dispersive phenotypes.

Place, publisher, year, edition, pages
John Wiley & Sons, 2009. Vol. 183, no 3, 667-677 p.
National Category
Ecology Earth and Related Environmental Sciences
URN: urn:nbn:se:umu:diva-25541DOI: 10.1111/j.1469-8137.2009.02948.xOAI: diva2:232027
Available from: 2009-08-19 Created: 2009-08-19 Last updated: 2014-01-21Bibliographically approved

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Giles, Barbara E.Lars Ericson, Lars
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