This issue focuses on the concept of ecological 'thresholds' and how these may be used in managing our landscapes. Are there break-points in nature that respond to the ways we manage land, beyond which we should not goΓ The break-point may be the rapid decline of a species in response to declining levels in key factors, such as sites to shelter and breed. It's a bit like asking 'How much is enoughΓ' Where research establishes that a threshold exists, the implication for managers is that we should stop before we reach that point or we will have gone too fa An occasional magazine from Land & Water Australia's Native Vegetation Program that is