Ecological Archives E089-075-A2

David W. Roberts. 2008. Statistical analysis of multidimensional fuzzy set ordinations. Ecology 89:1246–1260.

Appendix B. An example of deriving a Pi species response curve from four parameters.

FigB1
 

   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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