The Breeding Group and Seed Storage: A Study in Population Dynamics

Epling, Carl; Lewis, Harlan; Ball, Francis M.

doi:10.1111/j.1558-5646.1960.tb03082.x

Cited by 119 publications

(80 citation statements)

References 2 publications

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“…A notable example is that of Linanthus parryae, a desert annual for which we have annual observations covering two decades. We know that seeds of this species remain viable in the ground for at least ten years and probably much longer (Epling, Lewis, and Ball, 1960). But apparently no species of Clarkia is adapted to sporadic rainfall such as one finds in the desert and consequently must replenish the local seed supply at frequent, almost annual, intervals.…”

Section: Indigenous Indigenousmentioning

confidence: 99%

Catastrophic Selection as a Factor in Speciation

Lewis

1962

Evolution

Self Cite

172

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Section: Indigenous Indigenousmentioning

confidence: 99%

Catastrophic Selection as a Factor in Speciation

Lewis

1962

Evolution

Self Cite

172

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“…If longevity is greater than 2-3 yr, or the proportion of hard seed carryover significantly in excess of 20%, then our model would tend to underestimate the effects of hard seed carryover. Epling, Lewis, and Ball (1960) gave considerable weight to hard seed carryover as a factor affecting gene frequencies in Linanthus. In our experiment the combined effect of migration and hard seed carryover was greater than the effect of migration alone.…”

Section: (O) Number Of Allelesmentioning

confidence: 99%

Computer Simulation of a Sporophytic Self-Incompatibility Breeding System

Imrie¹,

Kirkman²,

Ross³

1972

Aust. Jnl. Of Bio. Sci.

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A sporophytic self· incompatibility system, such as occurs in Carthamus jlavescens Spreng., was studied by computer simulation. Equilibrium gene frequencies in an infinite population were estimated for three-allele and six-allele systems and found to be independent of initial frequencies. In a species existing as a series of more or less isolated small populations genetic drift caused rapid loss of alleles. Maintenance of the S allele system was enhanced by increased population size, and particularly by migration, by which alleles lost from one local population could be re-introduced from adjacent populations. Hard seed carryover had a lesser effect.

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“…More studies are needed that integrate ecological and genetic information to provide a better picture of how genetic structure is shaped. For instance, fluctuations in population size are expected to be common in annual plants and in other species (Mac Arthur & Wilson, 1967) but only a few studies have documented how the population structure changes during such fluctuations (Epling et al, 1960;Gottlieb, 1974). As many factors appear to act simultaneously in determining population genetic structure, it is necessary to consider as many potential factors as possible before we can draw conclusions about their relative importance.…”

Section: Introductionmentioning

confidence: 99%

Factors influencing the genetic structure of Phacelia dubia, a species with a seed bank and large fluctuations in population size

Castillo

1994

Heredity

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The potential factors that may influence the genetic structure of the gynodioecious annual Phacelia dubia were assessed using electrophoretic and ecological information at a locality in which the population size changed by about three orders of magnitude. Fluctuations in population size appeared to have little influence on the allelic composition, heterozygosity and mixed mating system of the population. Despite wide fluctuations in total population size, the estimated effective population size during (Ne =20) and after the bottleneck (N = 28) was little changed. Also, a significant spatial substructuring, evidenced by a dine in MDH and by the F-statistics, was observed before and after the bottleneck. The recovery of the population and the preservation of genetic diversity was attributable in part to the seed bank in the soil. Spatial gene flow via seeds was small compared with pollen flow and both were restricted. Nevertheless, substructuring contributes to a small portion of the total inbreeding. Also, the rate of apparent selfing of male steriles did not provide evidence of biparental inbreeding. Most of the inbreeding, however, was within subpopulations and autogamy appears to be the major contributor. It was concluded that the mating system is the leading factor determining the genetic structure and that the seed bank ensures genetic constancy in time in the face of large fluctuations in population size.

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The Breeding Group and Seed Storage: A Study in Population Dynamics

Cited by 119 publications

References 2 publications

Catastrophic Selection as a Factor in Speciation

Catastrophic Selection as a Factor in Speciation

Computer Simulation of a Sporophytic Self-Incompatibility Breeding System

Factors influencing the genetic structure of Phacelia dubia, a species with a seed bank and large fluctuations in population size

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