PATTERNS OF ALLOZYMIC SIMILARITY IN ECOLOGICALLY CENTRAL AND MARGINAL POPULATIONS OF
            <i>HORDEUM JUBATUM</i>
            IN UTAH

Shumaker, Kathy M.; Babble, Gary R.

doi:10.1111/j.1558-5646.1980.tb04793.x

Cited by 39 publications

(6 citation statements)

References 36 publications

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“…Periodic flooding and salinity fluctuations might produce conditions which are more favourable for seedling establishment. Action of natural selection on differentiation of marginal populations in H. jubatum has been suggested by Shumaker & Babble (1980). The limited regeneration from seeds in the UNI population means that the plants in this population are likely older than those in the ELS and FLO populations.…”

Section: Discussionmentioning

confidence: 99%

Adaptation to salinity inHordeum jubatum L. populations studied using reciprocal transplants

Wang

Redmann

1996

Vegetatio

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Tillers and seedlings of Hordeum jubatum L. from three sites with contrasting salinity regimes in central Saskatchewan, Canada were reciprocally transplanted in order to examine the tolerance of populations of this species to salinity and related habitat factors. Survival, growth and fecundity of the three populations were controlled more by transplant site characteristics than by genetic differences, i.e. differences among populations at a site tended to be smaller than differences among sites. Survival, growth and reproduction of all three populations were best at the non-saline site. The population originating at the non-saline site showed the poorest growth in the two saline habitats, but still had substantial salt tolerance. Fecundity was greatest when the populations were grow at their site of origin.

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Section: Discussionmentioning

confidence: 99%

Adaptation to salinity inHordeum jubatum L. populations studied using reciprocal transplants

Wang

Redmann

1996

Vegetatio

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“…The greatest number of populations occurs in Taiwan where the species is widely distributed and adapted to a variety of habitats. Theoretical predictions and several empirical studies suggest that geographically and ecologically marginal populations should have lower genetic variability than centrally located populations (e.g., Schumaker and Babble 1980, Brunsfeld et a/. 1991, Tsumura and Ohba 1993.…”

Section: Conservation Implicationsmentioning

confidence: 99%

Allozyme Variation and the Genetic Structure of Populations of Trochodendron aralioides, a Monotypic and Narrow Geographic Genus

Juei-Er

Huang

et al. 2001

J Plant Res

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Allozyme diversity was analyzed to determine the genetic structure of populations of Trochodendron araliokles Siebold 81 Zucc., a primitive angiosperm that is insectpollinated, has wind-dispersed seeds and grows only in eastern Asia. Nineteen populations were analyzed, including 16 from Ta'wan, two from the main islands of Japan and one from lriomote island in the Ryukyu Islands. Genetic variability (0.133) at the species level was more similar to that of a narrow geographic species than an endemic species. Based on genotype frequencies, mating within populations was non-random (Fs=O.O65) and there was significant genetic differentiation (FsT= 0.164) among populations. Genetic diversity was largely within, rather than among, populations (Hs= 0.132, 85;14°h). Bisexual flowers of T, araliohs exhibit synchronized dimorphism. The protogynous and protandrous morphs are self-incompatible, which probably promotes outcrossing and contributes to the huh levels of heterozygosity within populations. Using a maximum likelihood tree, populations of T. aralioMes were separated into two distinct clusters Japan and Taiwan/ lriomote island. Populations of T, aralioicbs on lriomote island and in northern Taiwan exhibited a high degree of genetic similarity. The isolation-by-distance model does not fit populations in Taiwan, but suitably describes the relationship between populations of T. ara/ioides in Japan and Taiwan.

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“…The observation of spermatogenic regions within female follicles as well as separated male and female gonadal regions within a single individual, and the completely dioecious central-range populations indicate that members of this genus possess a wide variety of reproductive modes, perhaps including self-fertilization. A similar reduction in heterozygosity and polymorphism has been observed in other potentially selffertilizing molluscs and plants (Selander & Hudson, 1976;Hornbach et al, 1980;McLeod & Sailstad, 1980;Shumaker & Babbel, 1980). This potential for selffertilization could have been instrumental in estalishment of this species' wide geographic range (North Carolina to Nova Scotia), although the existence of wide-ranging dioecious species indicate that the method of reproduction is only one of several variables important in range expansions.…”

Section: Patterns Observed Among Peripheral Populationsmentioning

confidence: 59%

Molecular genetics of peripheral populations of Nova Scotian Unionidae (Mollusca: Bivalvia)

Kat

Davis²

1984

Biological Journal of the Linnean Society

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Peripheral populations of eight species of freshwater bivalves (Unionidae) extending their geographic ranges into Nova Scotia, Canada, were examined electrophoretically to determine both the extent of genetic variability within such populations, and whether the hypothesized pathway of colonization across the Isthmus of Chignecto is reflected in patterns of genetic resemblance among these populations. The Nova Scotian species examined could be separated into two groups based on levels of observed heterozygosity and levels of variability in allele frequencies.The first group is characterized by low levels of heterozygosity and polymorphism compared with north-eastern American populations, and in the case of one species, Ellzptio complanata, considerable variability in allele frequencies among populations occurring in similar habitats in different drainagcs. Populations of E. complanata from Nova Scotia can be differentiated from conspecific populations on the southern Atlantic Slope by possession of fast alleles at two loci. Multivariate analyses define subgroups within populations of E. complanata consistent with hypothesis that the species invaded Nova Scotia by way of the Isthmus of Chignecto, and then split into two groups, one of which colonized Cape Breton to the north and the other of which colonized southern areas of the Province.The second group of Nova Scotian species is characterized by little reduction in heterozygosity and polymorphism compared with values observed among north-eastern American conspecifics or congeners, little variability in allele frequencies from population to population, and little evidence to suggest that these species were dependent on the land bridge to invade the Province.The type of dispersal is hypothesized to be responsible, in part, for these differences: larvae of species in the first group rely on a parasitic attachment to fish with territorial habits limited to fresh water, and are thus likely to invade new drainages separated by salt water by chance, in small numbers, and in stepping-stone fashion. Species in the serond group parasitize anadromous or saltwater tolerant hosts, are likely to be introduced into new habitats in greater numbers and/or rcreive greater amounts of gene flow subsequent to colonization, and seem less dependent on landbridges to colonize new habitats.

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PATTERNS OF ALLOZYMIC SIMILARITY IN ECOLOGICALLY CENTRAL AND MARGINAL POPULATIONS OF HORDEUM JUBATUM IN UTAH

Cited by 39 publications

References 36 publications

Adaptation to salinity inHordeum jubatum L. populations studied using reciprocal transplants

Adaptation to salinity inHordeum jubatum L. populations studied using reciprocal transplants

Allozyme Variation and the Genetic Structure of Populations of Trochodendron aralioides, a Monotypic and Narrow Geographic Genus

Molecular genetics of peripheral populations of Nova Scotian Unionidae (Mollusca: Bivalvia)

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