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 journalArticlepeer-review

    44 Scopus citations

    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

    All Science Journal Classification (ASJC) codes

    • Oceanography
    • Aquatic Science

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