Stensvold, Mary Clay , Farrar, Donald .
Genetic diversity in the Botrychium lunaria (Ophioglossaceae) complex.
Ferns in the Botrychium lunaria complex as currently recognized include Botrychium lunaria, B. crenulatum, B. tunux and B. yaaxudakeit, which have been distinguished from each other morphologically and genetically. Enzyme electrophoresis was used to examine allelic variation of 22 loci for 1574 plants in the B. lunaria complex from North America and Eurasia. Variation in allelic composition assessed by cluster analysis indicated that the B. lunaria complex is composed of nine genotypically distinct taxa. Genetic identity (GI) values (calculated from allele frequencies) were used as a guide to measure genetic distinctness between taxa and as an aid in determining taxon rank.
Our allozyme data suggest the following described and undescribed taxa: 1) B. neolunaria sp. nov. ined., a species endemic to North America; 2) B. lunaria, a circumpolar species retaining its current name; 3) B. lunaria var. crenulatum, a variety of B. lunaria endemic to the western U. S. and Canada that is genetically very close to typical B. lunaria; 4) B. lunaria var. melzeri var. nov. ined., a variety of B. lunaria endemic to Greenland, Iceland and Norway; 5) B. incisum sp. nov. ined., a species endemic to Iceland and Norway that is sister to the remainder of the B. lunaria complex; and 6) B. tunux, a species of northwestern North America with outliers in southwestern North America and Norway that may warrant varietal designation. Our data also show that B. lunaria and B. neolunaria sp. nov. ined. have hybridized and undergone allopolyploidy to produce the tetraploid B. yaaxudakeit.
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1 - USDA Forest Service, Alaska Region, 204 Siginaka Way, Sitka, Alaska, 99835, U.S.A.
2 - Iowa State University, Department of Ecology, Evolution & Organismal Biology, 253 Bessey Hall, Ames, Iowa, 50011-1020, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 28th, 2008
Time: 9:30 AM