The Comparative Biology of Closely Related Species Living in the Same Area

Clatworthy, J.N.; Harper, John L.

doi:10.1093/jxb/13.2.307

Cited by 60 publications

(9 citation statements)

References 8 publications

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“…Perhaps the most striking result is that vg, which the lowest viability in pure culture, is the line that profits most from the mixed situation. Clatworthy and Harper (1962) have described an analogous situation in duckweed. It is difficult from this experiment to make quantitative comparisons of 2-way and 3-way competition because, for example, in the 2-way cases Or is competing against an equal number of competitors of one of the other lines, whereas in the 3-way cases 30 Or are competing against 6o non-Or competitors.…”

Section: Evidence For Competitive Differences Between the Linesmentioning

confidence: 95%

Competition between three lines of Drosophila melanogaster

Gale

1964

Heredity

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Section: Evidence For Competitive Differences Between the Linesmentioning

confidence: 95%

Competition between three lines of Drosophila melanogaster

Gale

1964

Heredity

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“…The smaller individuals then increased the total biomass per unit area less than in the control treatment, as density increased. It has been argued that any influence that slows the rate of plant growth can be expected to delay and reduce the intensity of density stress among plants (Clatworthy & Harper 1962). The differences in biomass – density relationship between any of the stress treatments and the control in this study (Fig.…”

Section: Discussionmentioning

confidence: 99%

Lolium multiflorumdensity responses under ozone and herbicide stress

Martínez‐Ghersa

Radosevich

2009

Austral Ecology

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Adaptations to overcrowding of individual plants result in density dependant control of growth and development. There is little information on how anthropogenic stresses modify these responses. We investigated whether combinations of diclofop-methyl herbicide and tropospheric ozone alter the pattern of expected growth compensation with density changes resulting from intraspecific competition in Lolium multiforum Lam (Poacea) plants. Individual plant vegetative parameters and total seed production were assessed for plants growing under various densities and different herbicide rates and ozone treatments.The stressors differently changed the frequency distribution for average individual plant weight resulting from increasing densities. Only herbicide affected seedling mortality. Plants were able to compensate during grain filling maintaining similar seed production -density relationships in all treatments. Our findings contribute to the understanding of the impact of stress factors on the demographic changes in plant populations. Important ecological implications arise: (i) contrasting responses to ozone and herbicide, alone and in combination of individual plants resulted in different biomass -density relationships; (ii) stress effects on plant populations could not be predicted from individual responses; and (iii) changes in competitive outcome by single or combined stress factors may alter the expected genotype frequency in a crowded population with few dominant individuals.

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“…A similar study with very different organisms has been carried out by Clatworthy and Harper ( 1962). They carefully analyzed the population growth of several British species of Lemna (duckweed) and then measured competitive success by growing two different species together.…”

Section: Mechanism Of Coexistence In the Soilmentioning

confidence: 99%

Food Competition Among the Cellular Slime Molds (Acrasieae)

Horn¹

1971

Ecology

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Four species of Acrasieae (Dictyostelium mucoroides, D. purpureum, Polysphondylium pallidum, and P. violaceum) coexist in forest soils. All are capable of feeding and reproducing on a wide variety of bacteria than exist in their habitat. The four Acrasieae and four strains of food bacteria were isolated from the soil. When the four slime molds were forced to compete on a single strain of bacteria, one species always outcompeted the others. For any particular food the same species of Acrasieae is the consistent winter. Each species uses a different strategy to outcompete its competitors. The consistency of competitive success and the coarse—grained nature of the food distribution allow the coexistence of these four species of Acrasieae in nature.

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The Comparative Biology of Closely Related Species Living in the Same Area

Cited by 60 publications

References 8 publications

Competition between three lines of Drosophila melanogaster

Competition between three lines of Drosophila melanogaster

Lolium multiflorumdensity responses under ozone and herbicide stress

Food Competition Among the Cellular Slime Molds (Acrasieae)

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