The lack of genetic bottleneck in invasive Tansy ragwort populations suggests multiple source populations. |
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| Authors: | LJ Doorduin K van den Hof K Vrieling J Joshi |
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| Institution: | 1. Institute of Biology, Section Plant Ecology, Leiden University, Sylviusweg 72, 233 BE Leiden, The Netherlands;2. Institute of Environmental Sciences, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;3. Institute of Biochemistry and Biology, Biodiversity Research/Systematic Botany, University of Potsdam, Maulbeerallee 1, 14469 Potsdam, Germany;1. Department of Invasion Ecology, Institute of Botany, The Czech Academy of Sciences, CZ-252 43 Pr?honice, Czech Republic;2. Department of Ecology, Faculty of Science, Charles University in Prague, CZ-128 44 Vini?ná 7, Prague, Czech Republic;3. Department of Botany, Faculty of Science, Charles University in Prague, CZ-128 01 Benátská 2, Prague, Czech Republic;1. Department of Ecology, Institute of Botany, Polish Academy of Sciences, Lubicz Str. 46, PL-31-512 Kraków, Poland;2. Institute of Zoology, Poznań University of Life Sciences, Wojska Polskiego Str. 71C, PL-60-625 Poznań, Poland;1. Australian Plague Locust Commission, Australian Government Department of Agriculture, GPO Box 858, Canberra 2601, Australia;2. Fenner School of Environment and Society, College of Medicine, Biology and Environment, Australian National University, Canberra 0200, Australia;1. Departamento de Ciencias del mar y biología aplicada, Universidad de Alicante, Apdo, Correos 99, 03080 Alicante, Spain;2. IRTA Aquatic Ecosystems, Ctra. Poble Nou km 5.5, Aptdo, Correos 200, 43540 Sant Carles de la Ràpita, Tarragona, Spain |
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| Abstract: | Jacobaea vulgaris (Asteraceae) is a species of Eurasian origin that has become a serious non-indigenous weed in Australia, New Zealand, and North America. We used neutral molecular markers to (1) test for genetic bottlenecks in invasive populations and (2) to investigate the invasion pathways. It is for the first time that molecular markers were used to unravel the process of introduction in this species.The genetic variation of 15 native populations from Europe and 16 invasive populations from Australia, New Zealand and North America were compared using the amplified fragment length polymorphisms (AFLP's). An analysis of molecular variance showed that a significant part (10%) of the total genetic variations between all individuals could be explained by native or invasive origin.Significant among-population differentiation was detected only in the native range, whereas populations from the invasive areas did not significantly differ from each other; nor did the Australian, New Zealand and North American regions differ within the invasive range. The result that native populations differed significantly from each other and that the amount of genetic variation, measured as the number of polymorphic bands, did not differ between the native and invasive area, strongly suggests that introductions from multiple source populations have occurred. The lack of differentiation between invasive regions suggests that either introductions may have occurred from the same native sources in all invasive regions or subsequent introductions took place from one into another invasive region and the same mix of genotypes was subsequently introduced into all invasive regions.An assignment test showed that European populations from Ireland, the Netherlands and the United Kingdom most resembled the invasive populations. |
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