Evolutionary divergence among adjacent plant populations I. The evidence and its theoretical analysis

Jain, S. K.; Bradshaw, A. D.

doi:10.1038/hdy.1966.42

Cited by 429 publications

(235 citation statements)

References 39 publications

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“…It is therefore not surprising that the process of speciation has been regarded as occurring by allopatric divergence followed by the development of breeding barriers either allopatrically (and therefore being chance by-products of the process of divergence) or sympatrically after the two divergent races meet. There is now considerable evidence (see Jam and Bradshaw, 1966) that divergence does not require prior isolation, and similarly it is pertinent to ask whether, as Thoday and Gibson (1962) have demonstrated, isolating mechanisms arise during this process of sympatric divergence.…”

Section: (C) Discussionmentioning

confidence: 99%

Evolution in closely adjacent plant populations IV. Barriers to gene flow

1968

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Section: (C) Discussionmentioning

confidence: 99%

Evolution in closely adjacent plant populations IV. Barriers to gene flow

1968

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“…However, although the vegetation beyond the wall is a dense sward of mixed pasture grasses, there are elevated metal concentrations up to ca. 1-2 m beyond the wall (Jain and Bradshaw, 1966), presumably due to leaching from the adjacent area of mine tailings which is higher (ca. 1 m) relative to the pasture.…”

Section: Assessment Of Flowering Timementioning

confidence: 99%

Evolution in closely adjacent plant populations X: long-term persistence of prereproductive isolation at a mine boundary

2006

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Flowering time differences between metal-tolerant and nontolerant populations of the grass Anthoxanthum odoratum growing across a mine boundary have persisted for over 40 years. These flowering time differences result in a high degree of prezygotic genetic isolation (isolation index ¼ 0.43) between the tolerant mine populations and nontolerant pasture populations. Previous work showing genetic determination of flowering time and a high turnover of individual plants argues strongly for the selective maintenance of this difference.

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“…The advantage associated with increased pollen dispersal will depend on the origin ofgenetic differentiation occurring at various levels of population subdivision. Differentiation due to divergent selection pressures may lead to selection to reduce pollen dispersal (Jain and Bradshaw, 1966;Slatkin, 1973;May et al, 1975;Price and Waser, 1979;Falconer, 1981;Price, 1983, 1989). Pollinator grooming behavior may also be an important constraint to the evolution of high pollen dispersal in animal pollinated plants (Harder and Thomson, 1989).…”

Section: The Effect Of Interparent Distance On Progeny Fitnessmentioning

confidence: 99%

GENE FLOW IN CHAMAECRISTA FASCICULATA (LEGUMINOSAE) II. GENE ESTABLISHMENT

Fenster

1991

Evolution

102

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The role of gene establishment in gene flow was investigated in a population of the annual legume Chamaecrista fasciculata by determining the effect of interparent distance on progeny fitness throughout the entire life history. A decelerating gain in progeny fitness with increasing interparent distance was observed. Selfed progeny suffered a 2‐fold fitness disadvantage compared to progeny derived from mating events between individuals in the same neighborhood. Progeny derived from within neighborhood crosses had lower fitness than progeny from crosses between neighborhoods. Coupling the effect of interparent distance on gene establishment with information on gene dispersal resulted in a considerable increase in estimated gene flow. However, gene flow was still limited, as the average neighborhood area corresponded to a circle with radius of approximately 3.0 m. Yearly fluctuations in population size and variation in reproductive output lowered the estimate of Ne below the census estimate to approximately 100 individuals. The role of a seed bank in increasing the estimate of Ne was found to be insignificant. It is likely that genetic drift plays a major role in determining the distribution of genetic variation in this population.

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Evolutionary divergence among adjacent plant populations I. The evidence and its theoretical analysis

Cited by 429 publications

References 39 publications

Evolution in closely adjacent plant populations IV. Barriers to gene flow

Evolution in closely adjacent plant populations IV. Barriers to gene flow

Evolution in closely adjacent plant populations X: long-term persistence of prereproductive isolation at a mine boundary

GENE FLOW IN CHAMAECRISTA FASCICULATA (LEGUMINOSAE) II. GENE ESTABLISHMENT

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