Abstract Detail

Genetics Section

Mylecraine, Kristin A. [1], Smouse, Peter E. [1], Kuser, John E. [1], Zimmermann, George L. [2], Struwe, Lena [1].

Geographic variation in Atlantic white-cedar, Chamaecyparis thyoides (Cupressaceae).

Atlantic white-cedar, Chamaecyparis thyoides (Cupressaceae) is an important wetland tree species occurring along the Atlantic and Gulf coasts of the United States. The economic and ecological importance of white-cedar, coupled with significant population declines, has led to increasing interest in the management and restoration of this species. The geographic distribution of genetic variation is an important consideration for designing appropriate management and restoration plans, yet little is known about the genetic structure of white-cedar populations. We present results of the first rangewide genetic study of the species, and have examined patterns of allozyme, morphological, cpDNA, and provenance (common garden) variation. Among tree species, different sets of genetic markers and traits often exhibit different geographic patterns of variation, and this seems to be the case for white-cedar. Allozymes suggest significant regional structure, with three main regions and two additional subregions identified. Morphological variation and the distribution of cpDNA haplotypes of the trnD-trnY intergenic spacer region correspond with previously published intraspecific varieties. Results of provenance testing in New Jersey and North Carolina common gardens indicate significant latitudinal patterns of variation in survival and growth, suggesting that white-cedar populations are adapted to the climatic conditions at their latitude of origin. These combined results suggest that propagule movement for regeneration and restoration purposes should be restricted within the species.

1 - Rutgers University, Ecology, Evolution, & Natural Resources, 14 College Farm Rd, New Brunswick, New Jersey, 08901, USA
2 - Richard Stockton College of New Jersey, NAMS, PO Box 195, Pomona, New Jersey, 08240, USA

Keywords:
Cupressaceae
Allozyme
isozyme
phylogeography
geographic variation
genetic structure
eastern North America.

Presentation Type: Paper
Session: 41-8
Location: Peruvian (Cliff Lodge)
Date: Wednesday, August 4th, 2004
Time: 10:00 AM
Abstract ID:324