Phylogeography of northern North America with insights from paleontological, geological, and molecular data
McLachlan, Jason S. , Manos, Paul S. , Clark, James S. , Oh, Sang-Hun .
How severe are bottlenecks during climate-driven range expansions?
Genetic theory suggests that glacial-interglacial cycles result in differentiated reservoirs of genetic diversity in the southern range of northern hemisphere temperate species and genetically depauperate and homogenous assemblages in the recently recolonized northern range of these species. Such patterns have been identified across numerous temperate European tree species, provoking concern that this mechanism of preserving genetic diversity through glacial cycles might fail under novel anthropogenic warming trends: The elimination of southern populations will permanently remove these reservoirs of genetic diversity, while northward range expansion will only further reduce northern diversity through the bottlenecks associated with rapid range expansion by long-distance dispersal. We examined chloroplast DNA diversity across the ranges of a suite of temperate tree species in eastern North America (ENA). Patterns of genetic diversity and differentiation in these species differed substantially from the expected pattern, with a lack of differentiation among southern populations and high genetic diversity in northern populations. Although the history of Quaternary glaciation is broadly similar in Europe and ENA, North American tree species are better positioned to maintain genetic diversity in the face of anthropogenic warming.
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1 - University of Notre Dame, Biological Sciences, 107 Galvin, Notre Dame, IN, 46556, USA
2 - Duke University, Department of Biology, 139 Biological Sciences Building, PO Box 90338, Durham, North Carolina, 27708, USA
3 - Duke University, Nicholas School of the Environment, Box 90328, Durham, NC, 27708, USA
4 - Cornell University, L. H. Bailey Hortorium, Department of Plant Biology, 412 Mann Library, Ithaca, New York, 14853, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Room 4/Woodward
Date: Monday, July 28th, 2008
Time: 10:30 AM