Interspecific competition among metapopulations with space-limited subpopulations

Yoh Iwasa, Jonathan Roughgarden

Research output: Contribution to journalArticle

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Abstract

A model of the dynamics of a single metapopulation with space-limited subpopulations (J. Roughgarden and Y. Iwasa, 1986, Theor. Pop. Biol. 29, 235-261) is extended to include interspecific competition for space. The location and stability of steady states for the regional competition community are analyzed; a necessary condition for stable regional coexisitence of many species, and the condition for successful invasion of a new species into a region, are derived. General results are (1) the number of species that can coexist in a regional competition community is less than or equal to the number of distinct types of local habitats in the region and (2) for any pair of species coexisting in a regional community, say species-i and species-j, there is at least one place where species-i has a higher productivity relative to its larval mortality rate than species-j, and at least one place where species-j has a higher productivity relative to its larval mortality rate than species-i. A regional competition community consisting of two species competing for the space in two local habitats is analyzed using a graphical classification. If both local habitats are net "sources" of larvae for the regional populations of both species, then the qualitative results of interspecific competition on a regional scale are the same as those of the classical two-species Lotka-Volterra competition equations. If one of the local habitats is a net "sink" for larvae of one or more of the metapopulations, then additional results are possible: (1) The existence of a species may require the presence of its competitor. (2) A species which cannot invade an empty regional community may be able to invade if another species is present, and may then displace the first species leaving a regional community that again has one species. (3) A second species may invade a regional community containing one species with the end result that both become extinct.

Original languageEnglish
Pages (from-to)194-214
Number of pages21
JournalTheoretical Population Biology
Volume30
Issue number2
DOIs
Publication statusPublished - Jan 1 1986

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metapopulation
interspecific competition
subpopulation
Ecosystem
habitats
larvae
Larva
dynamic models
Mortality
new species
habitat
larva
mortality
productivity
Population

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences(all)
  • Ecology, Evolution, Behavior and Systematics

Cite this

Interspecific competition among metapopulations with space-limited subpopulations. / Iwasa, Yoh; Roughgarden, Jonathan.

In: Theoretical Population Biology, Vol. 30, No. 2, 01.01.1986, p. 194-214.

Research output: Contribution to journalArticle

Iwasa, Yoh ; Roughgarden, Jonathan. / Interspecific competition among metapopulations with space-limited subpopulations. In: Theoretical Population Biology. 1986 ; Vol. 30, No. 2. pp. 194-214.
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