Economic Defensibility

Economic Defensibility - 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 Economic defensibility model accounts for the pattern of facultative territoriality documented for many animal species, such as the hummingbirds mentioned above A great amount of variation in the degree of territorial exclusivity is documented for various human societies as well: some folks make definite claims of land ownership and defend these with various means ranging from magic and morality to threats and force, while others allow relatively free access to the land and its resources
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Economic Defensibility - Economic Defensibility When does...

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