[pixl97]

Huge amount of monocultures are not the sign of a healthy environment, but one that is at the precipice of collapse.

This behavior is seen in animal populations quite often. A series of 'good' events happen allowing the population to expand beyond the mean population capacity. If the good times are excessively long or excessively good you can see a rapid overshoot in total population. When this occurs the population is screwed. Even if 'bad' times do not come just reducing resources to what the mean population can support means that a large dying off will occur, that die off will typically kill almost all the population of said animal because of consumption of almost all available food. You then get a drastic reduction in total population far below the mean carrying capacity. If the environment switches from 'good' times, say high water availability into extreme extended drought you can get species extinction.