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Abstract Detail



Biogeography

Ciotir, Claudia [1], Yesson, Christopher [2], Freeland, Joanna [3].

Widespread introductions of non-native lineages: Phylogeographic data reveal cryptic intercontinental dispersal of three increasingly aggressive cattail (Typha) species.

Cattails (Typha spp.) are common inhabitants of wetlands around the world, but in recent years they have become invasive in many regions. We hypothesised that cattail invasiveness is connected to recent cryptic introductions of non-native lineages following multiple intercontinental dispersal events. Using three chloroplast DNA regions, we reconstructed global phylogeographies of three Typha spp: T. latifolia, T. angustifolia, and T. domingensis. Although we identified intercontinental dispersal in all three species, the times of divergence between intraspecific lineages, and dispersal patterns between species, show considerable differences. In T. angustifolia and T. domingensis, we identified haplotypes that have recently diverged and moved from Europe and Asia to North America and Australia. In T. latifolia, in addition to little divergence of recently exchanged lineages between Europe, North America and Australia, we identified significant sequence divergence between and within continental clades (North America and Asia). These divergence patterns suggest that ancestral intercontinental dispersal occurred in T. latifolia prior to the recent introductions through long-distance dispersal. We conclude that recent intercontinental dispersal may partly explain the abundance of the most recent introduced haplotypes, although complex evolutionary histories may challenge a simple interpretation within at least some species.

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1 - Trent University, Environmental and Life Sciences Graduate Program, DNA Life & Health Science Building , 2140 East Bank Drive, Block C, Office C243, Peterborough, ON, K9J 7B8, Canada
2 - Institute of Zoology Zoological Society of London, Regent's Park, London , NW1 4RY, UK
3 - Trent University, Biology, C251 LHS Bldg, 2140 East Bank Drive, Peterborough, ON, K9J 7B8, Canada

Keywords:
Typha
phylogeography
cryptic introductions
continental dispersal.

Presentation Type: Oral Paper:Papers for Topics
Session: 50
Location: Magnolia/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 1:30 PM
Number: 50001
Abstract ID:106
Candidate for Awards:George R. Cooley Award


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