The origin of crops and domestic animals

The map below shows where particular plant and animal species were first cultivated or domesticated. Dif these practices arise independently in different areas, or did they appear by diffusion? In the case of some species (for example, the pig), there seems to have been independent development in different areas. In most cases, however, the contact between neighboring cultures facilitated the rapid rise of plant and animal cultivation around the earth.
  The origin of crops and domestic animals
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Alex

Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.