Ecosystem collapse

Ecological communities abruptly losing biodiversity, often irreversibly

An ecosystem, short for ecological system, is defined as a collection of interacting organisms within a biophysical environment. Ecosystems are never static, and are continually subject to both stabilizing and destabilizing processes. Stabilizing processes allow ecosystems to adequately respond to destabilizing changes, or perturbations, in ecological conditions, or to recover from degradation induced by them.

From Wikipedia, under CC BY-SA. More on occurri.