How do increased number of inter dependent communities in an ecosystem add to its stability ?

The same way a diversity of stock holdings lead to stability of income. Stocks, like populations, keep going up and down. When one goes down, it could cause a disaster in a simple system. In the more complex systems, there is always something to make up for it.



Another analogy is an American football team. You don't field a team with only 22 players on it. You need backups.How do increased number of inter dependent communities in an ecosystem add to its stability ?Safety in numbers. Since population is a dynamic figure subject to change, food sources are a major population control mechanism. An abundance of diversity in food sources will mitigate the effect of a particular food sources' scarcity on dependant populations, as well as reduce pressure on that food source due to the presence of alternatives.