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NatureServe Conservation Status Assessments: Rank Calculator Version 2.0

Executive Summary

NatureServe has developed a rank calculator to facilitate through automation the process of assigning conservation status ranks. The calculator works in combination with NatureServe’s data management system (Biotics 4) which contains the element database, including the rank factor information and assigned conservation status ranks for all elements.

The approach begins with the initial completion of an Element Ranking file within Biotics, which stores the summary data for the ten primary status factors which have been determined to be relevant for assessing extinction or extirpation risk of species and ecosystems. The ratings values for these factors can then be exported to this rank calculator. The rank calculator contains a series of procedures (points and rules) for using the factor ratings to generate a calculated status rank, which is reviewed, adjusted if deemed appropriate (with reasons documented), and finalized. For programs without Biotics, the calculator may used as a stand-alone application.

With the new rank calculator tool, NatureServe’s ability to upgrade its status ranks will be improved based on an accurate, consistent, repeatable, and transparent method. There will be continued emphasis on data accuracy by using the strength and expertise of the NatureServe network through ongoing peer review of new information collected by biologists throughout the network.