The effects of dynamical rates on species coexistence in a variable environment: The paradox of the plankton revisited

Lina Li, Peter Chesson

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Hutchinson’s famous hypothesis for the “paradox of the plankton” has been widely accepted, but critical aspects have remained unchallenged. Hutchinson argued that environmental fluctuations would promote coexistence when the timescale for environmental change is comparable to the timescale for competitive exclusion. Using a consumer-resource model, we do find that timescales of processes are important. However, it is not the time to exclusion that must be compared with the time for environmental change but the time for resource depletion. Fast resource depletion, when resource consumption is favored for different species at different times, strongly promotes coexistence. The time for exclusion is independent of the rate of resource depletion. Therefore, the widely believed predictions of Hutchinson are misleading. Fast resource depletion, as determined by environmental conditions, ensures strong coupling of environmental processes and competition, which leads to enhancement over time of intraspecific competition relative to interspecific competition as environmental shifts favor different species at different times. This critical coupling is measured by the covariance between environment and competition. Changes in this quantity as densities change determine the stability of coexistence and provide the key to rigorous analysis, both theoretically and empirically, of coexistence in a variable environment. These ideas apply broadly to diversity maintenance in variable environments whether the issue is species diversity or genetic diversity and competition or apparent competition.

Original languageEnglish (US)
Pages (from-to)E46-E58
JournalAmerican Naturalist
Volume188
Issue number2
DOIs
StatePublished - Aug 1 2016

Fingerprint

coexistence
plankton
resource depletion
competitive exclusion
intraspecific competition
interspecific competition
timescale
environmental change
species diversity
genetic variation
environmental factors
apparent competition
prediction
resource
rate
effect
environmental conditions

Keywords

  • Competitive exclusion
  • Covariance between environment and competition
  • Nonequilibrium coexistence
  • Storage effect
  • Temporal environmental variation
  • Temporal scale

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

The effects of dynamical rates on species coexistence in a variable environment : The paradox of the plankton revisited. / Li, Lina; Chesson, Peter.

In: American Naturalist, Vol. 188, No. 2, 01.08.2016, p. E46-E58.

Research output: Contribution to journalArticle

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