Griffith, M. Patrick , Little, Damon , Calonje, Michael A. , Stevenson, Dennis Wm. , Husby, Chad E. .
Time, place, and relationship: Cycad phenology in phylogenetic and biogeographic context.
Phenological studies are increasingly relevant as indicators of global climate change. Ancient lineages, such as cycads, that have survived major climatic shifts during their long history on earth, may offer insight into phenological evolution. Recent work has demonstrated adaptation of cycad populations over shorter timescales. Thus cycads present an ideal model system to investigate deep history of phenological variation as well as recent phenological shifts. For over a decade, phenological observations have been compiled for MBC collections, which comprise 3,000 plants in 257 taxa, structured to capture genetic and geographic diversity. Monthly observations of vegetative flushing, cone emergence, pollination, and seed maturity were compiled for 35 species representing nine cycad genera. Phylogenetic relationships among these collections were estimated from nrITS, rpoB, and matK sequences. Provenance data for collections were mapped using GIS software. Common garden phenological data viewed in the context of lineage and provenance offer direct insight to adaptive shifts and constraints, while also providing a foundation for finer scale resolution of specific ecological or biogeographic phenomena.
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1 - Montgomery Botanical Center, 11901 Old Cutler Road, Miami, Florida, 33156, USA
2 - The New York Botanical Garden, Lewis B. and Dorothy Cullman Program for Molecular Systematic Studies, 200th St. & Southern Blvd., Bronx, New York, 10458-5126, USA
3 - New York Botanical Garden, Institute of Systematic Botany, 200Th Street & Southern Boulevard, Bronx, New York, 10458-5126, USA
Presentation Type: Oral Paper:Papers for Topics
Date: Wednesday, July 30th, 2008
Time: 11:15 AM