An ecosystem is Collapsed when it is virtually certain that its defining biotic or abiotic features, collapse is considered an endpoint of ecosystem decline hence  must only be assigned when the heuristics complies a very high standard.
An ecosystem is Collapsed when it is virtually certain that its defining biotic or abiotic features are lost from all occurrences, and the characteristic native biota are no longer sustained. Collapse is considered an endpoint of ecosystem decline and degradation and is thus the most extreme outcome of the risk assessment protocol. For this reason, this category must only be assigned when the evidence complies a very high standard. 
