Protecting Biodiversity: A Guide to Criteria Used by Global by Elizabeth A. Gordon, and Mary L.Tyrrell

By Elizabeth A. Gordon, and Mary L.Tyrrell

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Extra resources for Protecting Biodiversity: A Guide to Criteria Used by Global Conservation Organizations

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These entities develop, manage, and distribute authoritative information about biological diversity to landowners and land managers, consultants, and scientists (NCASI 2004). (See Appendix for additional information on NatureServe). Species Decline The declining species criterion was not commonly used among the approaches we studied per se, probably because species decline is incorporated into the threatened species criterion. , endangered, critically endangered) have undergone historical decline (refer to Appendix for IUCN listing criteria for Endangered Species); however, not all species that have undergone historical decline are necessarily listed as endangered or threatened.

Endemic species are defined as those that are found solely within a particular area and nowhere else on the planet. The link between averting extinction and focusing on endemics is clear: a focus on endemics is by definition a focus on the only place on earth where a particular species is found. Endemism is a relative measure that must be paired with a geographic area. For example, a bird species that is found only on a particular island is endemic to that island. Since species often evolve via a series of specific environmental influences to which they must adapt over many years, areas that are geographically isolated, such as islands, tend to host a greater number of endemic species.

Endangered, critically endangered) have undergone historical decline (refer to Appendix for IUCN listing criteria for Endangered Species); however, not all species that have undergone historical decline are necessarily listed as endangered or threatened. WCS’s Range-wide Priority Setting approach uses species decline among other factors to determine which populations of a species should be targeted for conservation attention. Among regional approaches, TNC uses decline as a criterion, defining declining species as those that have “significant, long-term declines in habitat and/or numbers, are subject to a high degree of threat, or may have unique habitat or behavioral requirements that expose them to great risk” (Groves et al.

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