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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Despite increases in urchin abundance, otter numbers continued to decline. Angeler Ecology and society: We therefore created predictions of patterns in plant functional traits that would test the alternative stable states model of these systems. Macroalgal and urchin barren communities are alternately stable and persist in the Aleutians due to sea otter presence and absence. Kelp Forests versus Urchin Barrens: Moving from Ecological Conservation to Restoration: Introduction Natural communities can exist at multiple stable points in time or space [1].

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The meaning of stability.

BlancoChih-Wei Yu lewobtin, B. Skip to search form Skip to main content. In the early s, a rapid sea otter population decline ca. The meaning of stability.

Lewontin Published in Brookhaven symposia in biology Save to Library. TngGreg Lewontib. Reorganization of interaction networks modulates the persistence of species in late successional stages.

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The meaning of stability. – Semantic Scholar

We measured functional traits of tne and shrubs across tropical and temperate rainforest — open vegetation transitions in Australia, with giant eucalypt forests situated between these vegetation types. LabaughNed H. In the early s a rapid otter population decline released urchins from predation and caused a shift to the urchin-dominated state. See our FAQ for additional information. In multivariate analyses, tropical and temperate rainforest diverged functionally, and both segregated from open vegetation.

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. 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.

Significant changes in the abundance of key species are widely cited as evidence of phase shifts [5, 6] but see [7] and have been documented both experimentally [8] and empirically [9, 10] in coastal marine ecosystems. The lack of clear functional differentiation from rainforest suggests that giant or forests are unstable states within the basin of attraction of rainforest.

With sea otters present, sea urchins are reduced to sparse populations enabling kelps to flourish.

We analysed a set of functional traits: Ecological theory differentiates rainforest and open vegetation in many regions as functionally divergent alternative stable states with transitional ecotonal vegetation between the two forming transient unstable states.

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

Phase shifts and stable states on coral reefs Steve R. Shifts to urchin barrens do affect prey quality but changes are likely o by increased prey densities and are insufficient in explaining current otter population status in the Aleutians.

Such states are nontransitory, persist over ecologically relevant timescales, and are therefore considered domains of stable equilibrium [2, 3]. EulissDonald O.

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The meaning of stability. – Abstract – Europe PMC

Interplay between stochastic and deterministic processes in the maintenance of alternative community states in Verrucomicrobia-dominated shallow lakes. Our results have important implications for giant eucalypt forest management. We conclude that tropical and temperate giant eucalypt forests are ecologically and functionally convergent. 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].

Citations Publications citing this paper. JordanDavid M. DudgeonRichard B. Although debated, prey quality changes have been implicated in current otter population status.