Evol Ecol Res 1: 1-1 (1999) Full PDF if your library subscribes.
Has the ghost of competition passed?
Douglas W. Morris
Department of Biology and Faculty of Forestry and the Forest Environment, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada
Author to whom all correspondence should be addressed.
Theories of density-dependent habitat selection suggest that habitat-selecting competitors may stably co-exist in separate habitats with no competition (the ghost of competition past). The habitat distribution, and hence the value of the non-linear competition coefficients, depends on the joint densities of the competing species. I extend the theories to illustrate how non-linear effects arise from constant habitat-dependent competition. The habitat effect is easily estimated from census data by the use of habitat isodars (lines along which expected fitness is identical in both habitats). The isodar solutions not only reveal the ghost of competition, they can be used as a convenient assay for conditions of stable competitive co-existence and they allow calculation of the actual competition coefficients. The shapes of empirical isoclines are in general agreement with the theoretical predictions.
Keywords: co-existence, competition, ghost of competition, habitat selection, isocline, isodar, isoleg.
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