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Understanding how and when species respond to habitat change is relevant to sustaining viable populations in managed forest ecosystems. Because some ecosystem changes are irreversible, of particular interest is knowledge about non-linear or “threshold” change that may have rapid, drastic effects on species or ecosystems. Ecological thresholds involve a change in the rate of response to ecosystem change; a critical value of an ecosystem property at which previously linear or unobserved change becomes a drastic transformation. Around thresholds, change occurs suddenly. Paradoxically, the changed state may be long-lived or irreversible. Threshold change caused by habitat loss can result in small, unviable populations, or species extirpation or extinction. These threshold changes in species populations ultimately occur due to insufficient amounts of habitat, leading to the concept of minimum thresholds in habitat amount, or the “extinction threshold.” Although thresholds can manifest in many aspects of ecosystem
Dykstra, P.R.. 2004. Thresholds in Habitat Supply: A Review of the Literature. Ministry of Sustainable Resource Management; Ministry of Water, Land and Air Protection. Wildlife Working Report. R27
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