Representation of multistanza life histories in Ecospace models for spatial organization of ecosystem trophic interaction patterns

Carl Walters, Villy Christensen, William J. Walters, Kenneth Rose

    Research output: Contribution to journalArticle

    38 Citations (Scopus)

    Abstract

    Te Ecospace model for spatial organization of trophic interactions has seen limited use for evaluation of policies such as marine protected areas, partly because of concern about representing key indicator populations only by spatial biomass distributions. The software has been improved to include spatial representation of age structure for such species, by means of the Ecosim "multistanza" population submodel, which assumes similar diet compositions, predation risk, and vulnerability to fishing over blocks or stanzas of fish ages. A computationally efficient version of Ecospace now preserves the multistanza age structure over spatial habitat and ecosystem biomass maps, evaluating body growth and mortality rates as spatial averages weighted by relative biomass use of each model spatial cell. A more computationally intense version divides each multistanza population into spatial packets (an individual-based model approach) for more precise analysis of how movement patterns and movement histories over mosaics of trophic opportunities and risks affect population performance and variability. The two approaches give surprisingly similar predictions of abundance patterns over both time and space, agreeing well in case-study applications to the Gulf of Mexico and California coast with each other and with nonspatial Ecosim predictions.

    Original languageEnglish (US)
    Pages (from-to)439-459
    Number of pages21
    JournalBulletin of Marine Science
    Volume86
    Issue number2
    StatePublished - Apr 1 2010

    Fingerprint

    trophic interaction
    life history
    age structure
    ecosystems
    ecosystem
    biomass
    study application
    individual-based model
    predation risk
    prediction
    policy analysis
    protected area
    Gulf of California
    fishing
    vulnerability
    Gulf of Mexico
    space and time
    diet
    preserves
    software

    All Science Journal Classification (ASJC) codes

    • Oceanography
    • Aquatic Science

    Cite this

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    abstract = "Te Ecospace model for spatial organization of trophic interactions has seen limited use for evaluation of policies such as marine protected areas, partly because of concern about representing key indicator populations only by spatial biomass distributions. The software has been improved to include spatial representation of age structure for such species, by means of the Ecosim {"}multistanza{"} population submodel, which assumes similar diet compositions, predation risk, and vulnerability to fishing over blocks or stanzas of fish ages. A computationally efficient version of Ecospace now preserves the multistanza age structure over spatial habitat and ecosystem biomass maps, evaluating body growth and mortality rates as spatial averages weighted by relative biomass use of each model spatial cell. A more computationally intense version divides each multistanza population into spatial packets (an individual-based model approach) for more precise analysis of how movement patterns and movement histories over mosaics of trophic opportunities and risks affect population performance and variability. The two approaches give surprisingly similar predictions of abundance patterns over both time and space, agreeing well in case-study applications to the Gulf of Mexico and California coast with each other and with nonspatial Ecosim predictions.",
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    Representation of multistanza life histories in Ecospace models for spatial organization of ecosystem trophic interaction patterns. / Walters, Carl; Christensen, Villy; Walters, William J.; Rose, Kenneth.

    In: Bulletin of Marine Science, Vol. 86, No. 2, 01.04.2010, p. 439-459.

    Research output: Contribution to journalArticle

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