| Abstract Detail
Patterns and Processes of American Amphitropical Plant Disjunctions: New Insights Johnson, Leigh [1]. Stasis, evolution, and extirpation: exploring the fates of angiosperm species post long-distance dispersal with examples from Polemoniaceae. Amphitropical disjunct distributions between western North America and western South America are intriguing systems for understanding patterns and processes that drive plant diversification. Over 130 instances of species or species pairs with established distributions in temperate regions on both American continents are known, and this disjunct pattern has been characterized by a number of studies. A review of temperate American aphitropical disjuncts show the importance of pre-adaptations for both dispersal and establishment. Here, specific examples of dispersal, establishment, speciation, and extirpation are investigated using several herbaceous species from the phlox family (Polemoniaceae) and molecular data to address hypotheses concerning relative timing of specific instances of dispersal (i.e., pre- or post-Columbian) as well as the timing of dispersal events relative to processes, such as allopolyploidization and gradual divergence, that have led to the formation of novel species. Insights gained from these examples are likely generalizable to other taxa, though the data useful for discerning processes of diversification in many of the known disjuct species groups is presently lacking. Log in to add this item to your schedule
1 - Brigham Young University, Biology, 4102 Lsb, Provo, UT, 84602, USA
Keywords: none specified
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: 2:15 PM Number: C2004 Abstract ID:353 Candidate for Awards:None |