Dunbar noted that the groups fell into three categories—small, medium and large, equivalent to bands, cultural lineage groups and tribes—with respective size ranges of 30–50, 100–200 and 500–2500 members each.
It appears the ideal human community is around 150 people. And by plotting the correlation and extrapolating it to the size of the human brain, Dunbar made a famous prediction that has become known as Dunbar’s number: the number of people that one person can maintain meaningful relationships with is about 150.
Hunter-gatherer groups tended to range in size from an extended family to a larger band of no more than about 100 people.
The critical community size (CCS) is the minimum size of a closed population within which a human-to-human, non-zoonotic pathogen can persist indefinitely. When the size of the closed population falls below the critical community size level, the low density of infected hosts causes extinction of the pathogen.
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Hunter-Gatherer Groups The ancient hunter-gatherers lived in small groups, normally of about ten or twelve adults plus children. They were regularly on the move, searching for nuts, berries and other plants (which usually provided most of their nutrition) and following the wild animals which the males hunted for meat.
The world population before the time agriculture emerged (roughly at 10,000 BC) was estimated to be about 10 million. So, there is a reason to believe that the carrying capacity of Earth for humans living from hunting and gathering should be no more than 10 million people.
Conclusion. Excepting outside forces such as violence and disease, hunter-gatherers can live to approximately 70 years of age. With this life expectancy, hunter-gatherers are not dissimilar to individuals living in developed countries.
Groups of two persons (called by many names: dyads, pairs, couples, duos, etc.) Unlike a larger group, though, which can replace lost members and last indefinitely, a dyad exists only as long as both member participate.
The word community refers to multiple populations. It describes the various populations that share a habitat at the same time. Because communities consist of multiple populations, there are multiple species and gene pools within a community.
A community is a social unit (a group of living things) with commonality such as norms, religion, values, customs, or identity. Communities may share a sense of place situated in a given geographical area (e.g. a country, village, town, or neighbourhood) or in virtual space through communication platforms.
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