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Abstract Detail

Patterns and Processes of American Amphitropical Plant Disjunctions: New Insights

Lewis, Lily R. [1], Biersma, Elisabeth M. [2], Rozzi, Ricardo [3], Goffinet, Bernard [4].

American temperate and polar amphitropical bryophytes.

The floras of the northern and southern temperate to polar regions are particularly rich in bryophyte species. In contrast to the typical pattern of decreasing biodiversity with increasing latitude, species richness of bryophytes increases with increasing latitude, along with the ratio of bryophytes to tracheophytes. Connectivity between these bryophyte rich regions is revealed by a known 77 bryophyte species with American amphitropical disjunctions. We provide a brief summary of shifts in biogeographic and evolutionary concepts relevant to amphitropical bryophytes driven by modern molecular phylogenetic approaches. Amphitropical disjunctions in bryophytes have been typically recognized as occurring below the level of species, compared to many angiosperms for which amphitropical disjunctions occur at broader taxonomic ranks, a trend which likely reflects species concepts. We discuss special features of bryophytes, such as totipotency and microscopic diaspores that facilitate long distance range expansions between the northern and southern temperate and polar regions by migrant birds. Lastly, we synthesize results from the reconstruction of the phylogeographic history of the American amphitropical dung moss, Tetraplodon with other molecular phylogenetic studies, and suggest early emerging trends and considerations for the study of modern temperate to polar amphitropical disjunctions.

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1 - University of Florida, Biology, PO Box 118525, Gainesville, FL, 32611, USA
2 - British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
3 - University of North Texas, Philosophy, Denton , TX, 76201, USA
4 - University of Connecticut, Ecology & Evolutionary Biology, 75 N Eagleville Road, U-3043, Storrs, CT, 06269, United States

bipolar disjunction
long-distance dispersal.

Presentation Type: Colloquium Presentations
Session: C2, Patterns and Processes of American Amphitropical Plant Disjunctions: New Insights
Location: 204/Savannah International Trade and Convention Center
Date: Tuesday, August 2nd, 2016
Time: 2:30 PM
Number: C2005
Abstract ID:234
Candidate for Awards:None

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