A General Hypothesis of Species Diversity

The American Naturalist, Год журнала: 1979, Номер 113(1), С. 81 - 101

Опубликована: Янв. 1, 1979

A new hypothesis, based on differences in the rates at which populations of competing species approach competitive equilibrium (reduction or exclusion some species), is proposed to explain patterns diversity. The hypothesis assumes that most communities exist a state nonequilibrium where prevented by periodic population reductions and environmental fluctuations. When prevented, dynamic balance may be established between rate displacement frequency reduction, results stable level Under conditions infrequent reductions, an increase growth competitors generally decreased This model clarifies underlying pattern variation diversity points out common elements previous hypotheses. Rather than arguing either competition, predation, productivity control diversity, it demonstrates all these contribute same basic mechanism. In doing so, not only explains correlations other hypotheses with but also exceptions could explain. applied variations both latitudinal gradient within specific regions.

Язык: Английский

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Global Models of Growth and Competition

Proceedings of the National Academy of Sciences, Год журнала: 1973, Номер 70(12), С. 3590 - 3593

Опубликована: Дек. 1, 1973

Very precise data on the dynamics of a competitive system two species Drosophila have been obtained. By curvilinear regression approach, analytical models competition fitted. statistical and biological criteria simplicity, reality, generality, accuracy, best these has chosen. This model represents an extension Lotka-Volterra competition; it adds fourth parameter that controls degree nonlinearity in intraspecific growth regulation. It similar logistic population growth.

Язык: Английский

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Competition between species: Theoretical models and experimental tests

Theoretical Population Biology, Год журнала: 1973, Номер 4(3), С. 331 - 356

Опубликована: Сен. 1, 1973

Язык: Английский

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Discrete time models for two-species competition

Theoretical Population Biology, Год журнала: 1976, Номер 9(2), С. 202 - 221

Опубликована: Апрель 1, 1976

Язык: Английский

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Competition between two species for two complementary or substitutable resources

Journal of Theoretical Biology, Год журнала: 1975, Номер 50(1), С. 185 - 201

Опубликована: Март 1, 1975

Язык: Английский

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Aggregation and the competitive exclusion principle

Journal of Theoretical Biology, Год журнала: 1989, Номер 136(1), С. 57 - 66

Опубликована: Янв. 1, 1989

Язык: Английский

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Reproductive Strategies and the Co-occurrence of Climax Tree Species

Science, Год журнала: 1975, Номер 189(4205), С. 808 - 810

Опубликована: Сен. 5, 1975

In a central New Hampshire forest, three co-occurring tree species were found to occupy different positions on reproductive strategy gradient. These differences, in part, described separate niches for the species. The three-species complex is hypothesized form dynamic climax overstory characterized by cyclical replacement of one dominant another.

Язык: Английский

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Interspecific competition is not a major organizing force in many insect communities

Nature, Год журнала: 1984, Номер 310(5975), С. 310 - 312

Опубликована: Июль 1, 1984

Язык: Английский

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Interspecific competition in Australian honeyeaters—depletion of common resources

Austral Ecology, Год журнала: 1979, Номер 4(2), С. 145 - 164

Опубликована: Июнь 1, 1979

Many species of honeyeaters and other nectar-feeding birds occur in most habitats South Australia. They frequently feed on nectar the same plants. A succession plants provide for throughout year. Nectar is abundant winter early spring least summer autumn. There more per flower flowers spring. often depleted by honeyeaters, sometimes visitors (silvereyes, lorikeets insects) between December May. It at times reduced to a level which it uneconomical some exploit. are seasonal movements into areas out these when becomes scarce. Breeding coincides with peak abundance nectar. Diversity probably maintained an interaction two types competition, exploitation interference. The larger use richest sources aggressively exclude smaller (interference) whereas can poorer because their energy requirements less (exploitation).

Язык: Английский

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Competition on a Divided and Ephemeral Resource

Journal of Animal Ecology, Год журнала: 1979, Номер 48(3), С. 899 - 899

Опубликована: Окт. 1, 1979

SUMMARY (1) Models of competition in divided or heterogeneous environments are reviewed. (2) A model a environment is presented. The coefficients, a, reduced by term, 0, which measures the amount overlap between species. (3) Actual values 0 presented for two Drosophila communities. (4) depends on degree aggregation competing species and their densities. outcome must, then, be density dependent. (5) Low improve stability multi-species community allow more

Язык: Английский

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