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(American Journal of Botany. 2000;87:372-381.)
© 2000 Botanical Society of America, Inc.

Genetic diversity and reproductive biology in Warea carteri (Brassicaceae), a narrowly endemic Florida scrub annual1

Margaret E. K. Evans5,2, Rebecca W. Dolan3, Eric S. Menges2 and Doria R. Gordon4

2 Archbold Biological Station, P.O. Box 2057, Lake Placid, Florida 33862 USA; 3 Friesner Herbarium, Butler University, Indianapolis, Indiana 46208 USA; and 4 The Nature Conservancy, Department of Botany, P.O. Box 118526, University of Florida, Gainesville, Florida 32611 USA

ABSTRACT

Carter's mustard (Warea carteri) is an endangered, fire-stimulated annual endemic of the Lake Wales Ridge, Florida, USA. This species is characterized by seed banks and large fluctuations in plant numbers, with increases occurring in postdisturbance habitat. We investigated the mating system, patterns of isozyme variation, and effective population sizes of W. carteri to better understand its population biology and to comment on reserve designs and management proposals relevant to this species. Warea carteri is self-compatible and autogamous, and probably largely selfing. Measures of genetic variation in W. carteri were lower than values reported for species with similar ecological and life history traits (6.6% of loci polymorphic within populations, 1.87 alleles per polymorphic locus, and 0.026 and 0.018 expected and observed heterozygosity, respectively). The high average value for Nei's genetic identity (0.989) reflects the paucity of genetic diversity. Genetic variation within populations was not correlated with aboveground population size, effective population size estimates (Ne), or recent disturbance history. Much of the diversity detected was found among populations (FST = 0.304). A significant cline in allele frequencies at one locus and a significant negative correlation between geographic distance and Nei's genetic identity also point to spatial organization of genetic diversity. As a result we propose that reserve design should include the entire geographic range of W. carteri. We also recommend that the natural fire regime be mimicked.

Key Words: Brassicaceae • effective population sizes • genetic diversity • mating system • Warea carteri.




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J. GONZALEZ-ASTORGA and G. CASTILLO-CAMPOS
Genetic Variability of the Narrow Endemic Tree Antirhea aromatica Castillo-Campos & Lorence, (Rubiaceae, Guettardeae) in a Tropical Forest of Mexico
Ann. Bot., May 1, 2004; 93(5): 521 - 528.
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