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Wednesday, 23 November 2016

Allee Principle of aggregation


Allee principle of aggregation states that either overcrowding (very high density) or under crowding (very low density) are detrimental to the population survival, growth and development. Allee observed that grouping of individuals are at more advantage then single organisms.
Allee principle states that the density is the limiting factor for population growth. Either density is low or high. It will resist the population growth.

Allee principle of aggregation: Organisms aggregate to form clusters in response to the social attraction, daily or seasonal climatic changes, to reproduction or differences in the local habitat.
Figure 12: (a) Strong Allee effect at low density population, (b) Weak Allee effect at accelerating proliferation rate and (c) Null hypothesis depicting decrease proliferate rate at low density which is otherwise accelerating.

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