Measurement of threat status has gained increasing attention among practitioners and students of conservation (e.g., Salafsky and Margoluis 1999, Hockings et al. 2001, Margoluis and Salafsky 2001, Ervin 2002). Clearly, without reduction in the threats to biodiversity, those species and ecosystems that are the focus of conservation efforts will rapidly degrade and disappear. Yet, regardless of its importance, measuring threat status is insufficient on its own, for several reasons. Most significantly, a focus on threat status alone must assume that there is a clear, often linear, relationship between a threat and the ecological integrity of biodiversity. This runs counter to recent evidence of the non-linear dynamics of ecosystems and threshold effects (e.g., Scheffer et al. 2001). Secondly, a singular focus on threats can lead to a โzero-toleranceโ approach to threat activities in human influenced landscapes. Under most circumstances, this is unrealistic. Thus, it is preferable to link threats assessment to ecological integrity or population viability assessments.
Here, a threat is defined as something negatively impacting a key ecological attribute. Conservation and management actions work to abate these impacts. Thus, there is a direct (and, it is hoped, clearly understood) linkage between the actions of the managers working on threats and the benefits to the ecological integrity and viability of targets of biodiversity. Again, this is addressed in greater depth in Chapter 8.
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Author
Bob Unnasch, Ph.D.
Sound Science LLC
Planning for biodiversity conservation
Planning for biodiversity conservation