LEWONTIN THE MEANING OF STABILITY PDF

Local stability. • Alternate stable states. Page Alternate stable states. Time. Parameter. Min. Max. Page Richard Lewontin. “The meaning of stability” . R. C. Lewontin, “The meaning of stability,” Brookhaven Symposia in Biology, vol. 22, pp. 13–24, Lewontin RC () The meaning of stability. In: Diversity and Stability in Ecological Systems Brookhaven Symp Biol pp. 13– PubMed.

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McKennaJames W. Kelp Forests versus Urchin Barrens: Although multiple stable states can exist simultaneously, communities typically alternate from one stable state to another, a shift often conveyed by a large perturbation applied directly to the state variables e. In multivariate analyses, tropical and temperate rainforest diverged functionally, and both segregated from open vegetation.

The meaning of stability.

The meaning of stability. Introduction Natural communities can exist at multiple stable points in time or space [1].

This study examined otter prey abundance, size, biomass, and potential energy density in remnant kelp forest and urchin-dominated communities to determine if alternate stable states affect prey quality.

Phase shifts and stable states on coral reefs Steve R.

Reorganization of interaction networks modulates the persistence of species in late successional stages. This paper has been referenced on Twitter 3 times over the past 90 days. We therefore created predictions of patterns in plant functional traits that would test the alternative stable states model of these systems.

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Lewontin Published in Brookhaven symposia in biology Save to Library. For most traits, giant eucalypt forest was similar to rainforest, while rainforest, particularly tropical rainforest, was significantly different from the open vegetation.

The background and some current problems of theoretical ecology Robert P.

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Findings suggest that although urchin barrens provide more abundant urchin prey, individual urchins are smaller and provide lower biomass and potential lewontij density compared to kelp forests. Such states are nontransitory, persist over ecologically relevant timescales, and are therefore considered domains of stable equilibrium [2, 3].

In the early s, a rapid sea otter population decline ca. Showing of 65 extracted citations.

Macroalgal and urchin barren communities are alternately stable and lewontun in the Aleutians due to sea otter presence and absence. With sea otters present, sea urchins are reduced to sparse populations enabling kelps to flourish. Citation Statistics Citations 0 10 20 ’74 ’84 ’95 ’06 ‘ In the early s a rapid otter population decline released urchins from predation and caused a shift to the urchin-dominated state.

A quantitative framework for assessing ecological resilience. MushetOwen P. Angeler Ecology and society: Interplay between stochastic and deterministic processes in the maintenance of alternative community states in Verrucomicrobia-dominated shallow lakes. JordanDavid M.

In general, predator removal causes prey community shifts enabling one or few algal or invertebrate competitive dominants to proliferate. Significant changes in the abundance of key species are widely cited as oof of phase shifts [5, 6] but see [7] and have been documented both experimentally [8] and empirically [9, 10] in coastal marine ecosystems.

Meainng two types of giant eucalypt forests also exhibited greater overall functional similarity mexning each other than to any of the open vegetation types. DudgeonRichard B.

This paper has citations. Shifts to urchin barrens do affect prey quality but changes are likely compensated by increased prey densities and are insufficient in explaining current otter population status in the Aleutians.

Despite increases in urchin abundance, otter numbers continued to decline. Potential mechanismsresearch avenuesand management action associated with size at age and growth of Pacific halibut Timothy Loher Executive Moving from Ecological Conservation to Restoration: We conclude that tropical and temperate giant eucalypt forests are ecologically and functionally convergent.

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We analysed a set of functional traits: In ecological studies in the Aleutian Islands, the presence and absence of dense sea otter populations can instigate state shifts between two alternately stable nearshore communities, one dominated by kelp and the other by sea urchins [11—13].

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LabaughNed H. EulissDonald O. Although debated, prey quality changes have been implicated in current otter population status. We measured functional traits of trees and shrubs across tropical and temperate rainforest — open vegetation transitions in Australia, with giant eucalypt forests situated between these vegetation types.

Article citations Lewontin RC The meaning of stability. With sea otters absent, dense sea urchin populations overgraze and exclude foliose macroalgae. Ecological theory differentiates rainforest and open vegetation in many regions as functionally divergent alternative meanlng states with transitional ecotonal vegetation between the two forming transient unstable states. Stable points are characterized by a specific structural and functional species assemblage recognizably different from other assemblages that can occur under the same set of environmental conditions.

Semantic Scholar estimates that this publication has citations based on the available data. BlancoChih-Wei Yu kewontin, B. Furthermore, the giant eucalypt forests overlapped in function with their respective rainforests. By clicking accept or continuing to use the site, you agree to the terms outlined in our Privacy PolicyTerms of Serviceand Dataset License. Robustness and Contingent History:

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