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• W2086823716 abstract "Mathematical models of a planktonic microcosm closed to material transfer were constructed and evaluated at combinations of five light and three temperature regimes. Model B contained 10 species: 5 photoautotrophs, 1 chemoautotroph, and 4 chemoheterotrophs. Nutrient mineralization in model B was accomplished entirely by bacterial decomposition and therefore varied with bacterial population dynamics. Model M was less complex, containing just the 5 autotrophs from model B. Nutrient mineralization in model M was modeled as enzymatic rate reactions, independent of bacterial dynamics. The presence of any single species in either model was markedly influenced by the modification of the resource base by other species. As a result, the community- and ecosystem-level properties of the models were emergent and could not, in general, be predicted solely from a knowledge of individual species' responses to different environmental conditions. Significant differences in behavior occurred between model B and model M. Model B showed strong correspondence between total cell numbers and biotic nutrient stores of carbon, nitrogen, and phosphorus. The communities of model B did not persist through time under any combination of light and temperature regime examined. The biologically simpler model M showed displacement between similar species; produced a comparatively constant biotic pool of carbon, nitrogen, and phosphorus in spite of variation in total cell numbers; and persisted much longer. We suggest that the differences in microcosm behavior in the two models arose from differences in the redundancy of species' roles in nutrient cycling. Since bacterial species in model B perform unique nutrient transformations, the loss of any of these species led to disrupted nutrient pathways and degraded ecosystem performance. Because nutrient mineralization in model M was not tied as closely to species persistence, nutrient availability was more easily maintained." @default.
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• W2086823716 date "1990-03-01" @default.
• W2086823716 modified "2023-09-25" @default.
• W2086823716 title "Models of Simple Microcosms: Emergent Properties and the Effect of Complexity on Stability" @default.
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• W2086823716 doi "https://doi.org/10.1086/285054" @default.
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