MICROEVOLUTIONARY PATTERNS AND PROCESSES OF THE NATIVE HAWAIIAN COLONIZING FERN ODONTOSORIA CHINENSIS (LINDSAEACEAE)

The vascular-plant flora of the Hawaiian Islands is characterized by one of the highest rates of species endemism in the world. Among flowering plants, approximately 89% of species are endemic, and among pteridophytes, about 76% are endemic. At the single-island level, however, rates of species ende...

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Bibliographic Details
Published in:Evolution 2000-06, Vol.54 (3), p.828-839
Main Authors: Ranker, T. A, Gemmill, C. E C, Trapp, P. G
Format: Article
Language:English
Subjects:
Alleles
Archipelagos
Biological Evolution
Colonization
Evolution
Evolutionary genetics
Ferns
Flowers & plants
gene flow
Gene Frequency
Genes
Genetic loci
Genetic Variation
Geography
Hawaii
microevolution
Nature trails
Odontosoria
Odontosoria chinensis
Phylogeny
Plants
Plants - genetics
Population genetics
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USA, Hawaii
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Summary:The vascular-plant flora of the Hawaiian Islands is characterized by one of the highest rates of species endemism in the world. Among flowering plants, approximately 89% of species are endemic, and among pteridophytes, about 76% are endemic. At the single-island level, however, rates of species endemism vary dramatically between these two groups with 80% of angiosperms and only 6% of pteridophytes being single-island endemics. Thus, in many groups of Hawaiian angiosperms, it is possible to link studies of phylogeny, evolution, and biogeographic history at the interspecific and interisland levels. In contrast, the low level of single-island species endemism among Hawaiian pteridophytes makes similar interspecific and interisland studies nearly impossible. Higher levels of interisland gene flow may account for the different levels of single-island endemism in Hawaiian pteridophytes relative to angiosperms. The primary question we addressed in the present study was: Can we infer microevolutionary patterns and processes among populations within widespread species of Hawaiian pteridophytes wherein gene flow is probably common? To address this broad question, we conducted a population genetic study of the native Hawaiian colonizing species Odontosoria chinensis. Data from allozyme analyses allowed us to infer: (1) significant genetic differentiation among populations from different islands; (2) historical patterns of dispersal between particular pairs of islands; (3) archipelago-level patterns of dispersal and colonization; (4) founder effects among populations on the youngest island of Hawaii; and, (5) that this species primarily reproduces via outcrossing, but may possess a mixed-mating system. Corresponding Editor: B. Bowen
ISSN:0014-3820
1558-5646
DOI:10.1554/0014-3820(2000)054[0828:MPAPOT]2.3.CO;2