Economic Defensibilit1

Economic Defensibilit1 - Economic Defensibility When does...

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Economic Defensibility When does evolutionary ecology predict that territorial behavior will occur? Basically, when resources are relatively ; this is often termed the "economic defensibility model" The predictions of this model can be outlined as follows: Case Resource Density Resource Predictability Spatial Organization A High Low Mobile & clumped; opportunistic resource defense B Low Low C High High Territorial defense D Low High Dispersed, low mobility (from Dyson-Hudson & Smith 1978 -- a paper that was your humble professor's first scholarly publication, while still a grad student) Logic here is that territoriality has costs as well as benefits; when resources (food, mates, nest sites, etc) are either too sparse or too ephemeral, it does not pay to defend a piece of land against competitors; instead, best option is to "scramble" for what's there, or even to gather in large groups & exchange information about the location of ephemeral resource patches
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