Appendix B. An example of deriving a Pi species response curve from four parameters.
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FIG. B1. An example of deriving a Pi species response curve from four parameters. p1 = minimum gradient value for the species to be present (minimum requirement for resources, or extent of tolerance for low values of an environmental factor); p2 = optimum gradient value; p3 = maximum gradient value for species to be present (extent of tolerance for high values of an environmental factor); p4 = maximum productivity (cover, biomass, etc.) for a species given optimum conditions. pa = (p2 + p1)/2; pb = (p3 + p2)/2.
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