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Genetic structure of Helianthus occidentalis (Asteraceae) in a preserve with fragmented habitat

We examined the spatial genetic structure of Helianthus occidentalis Riddell ssp. occidentalis Riddell (western sunflower) to determine whether this species is highly clonal and whether the distance between prairie patches influences genetic differentiation. In the Edge of Appalachia Preserve System...

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Published in:American journal of botany 1999-07, Vol.86 (7), p.988-995
Main Authors: Fore, S.A, Guttman, S.I
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Language:English
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Guttman, S.I
description We examined the spatial genetic structure of Helianthus occidentalis Riddell ssp. occidentalis Riddell (western sunflower) to determine whether this species is highly clonal and whether the distance between prairie patches influences genetic differentiation. In the Edge of Appalachia Preserve System, Ohio, this species is restricted to prairie patches that have a clumped distribution in the forest matrix. Data from this insect-pollinated forb with gravity-dispersed seed were compared to data from the same patches for Asclepias verticillata, an insect-pollinated species with wind-dispersed seed. Allozyme electrophoresis was used to collect genetic data from H. occidentalis samples from eight patches in four regions. Genetic data from three polymorphic loci indicted that this species is not highly clonal. Genetic differentiation was greater among patches within a region than among regions, suggesting that gene flow among patches is more limited in H. occidentalis than in A. verticillata. Founder effect may also have contributed to observed genetic differences among patches as some of these populations may have re-established after release from human use. As habitat fragmentation is increasing in the preserve, it is also likely that genetic differentiation may be increasing. Therefore, monitoring of genetic structure is necessary to further assess the effect of fragmentation.
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In the Edge of Appalachia Preserve System, Ohio, this species is restricted to prairie patches that have a clumped distribution in the forest matrix. Data from this insect-pollinated forb with gravity-dispersed seed were compared to data from the same patches for Asclepias verticillata, an insect-pollinated species with wind-dispersed seed. Allozyme electrophoresis was used to collect genetic data from H. occidentalis samples from eight patches in four regions. Genetic data from three polymorphic loci indicted that this species is not highly clonal. Genetic differentiation was greater among patches within a region than among regions, suggesting that gene flow among patches is more limited in H. occidentalis than in A. verticillata. Founder effect may also have contributed to observed genetic differences among patches as some of these populations may have re-established after release from human use. 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source JSTOR Archival Journals and Primary Sources Collection; Wiley-Blackwell Read & Publish Collection; Botanical Society of America
subjects Alleles
allozymes
Asclepias verticillata
Botany
clones
conservation areas
Flowers & plants
fragmentation
gene flow
Genetic diversity
Genetic loci
genetic polymorphism
Genetic structures
Genetic variation
Genetics
Genotypes
Geographic regions
Habitats
Helianthus
Helianthus occidentalis
loci
Plants
pollinators
Population Biology
Population genetics
Prairies
seed dispersal
spatial variation
USA, Ohio
title Genetic structure of Helianthus occidentalis (Asteraceae) in a preserve with fragmented habitat
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