Do not underestimate how much work there will be to operationalize that number or range once you've picked it. Picking the trigger is the "easy" bit.

My advice, pick something, anything, back your best expert judgement if you need to. Get the process operational because you can always go back and update the trigger threshold if you get better data and most land managers might not even notice or care.... having the process in place is often enough of a basis for adaptive management.

Remember that in the absence of your best guess, there is often nothing and people are just winging it. Land managers are probably much more comfortable with uncertainty that you are! Lean in 😊