Pacific Lamprey Nature Serve Rankings

Aug 11, 2014 (Last modified Nov 28, 2017)
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See the documents " Pacific Lamprey ( Entosphenus tridentatus) Assessment and Template for Conservation Measures" ( for complete information. These data were the results of the assessment and were used to create the maps found in the documents. NOTE the California assessment was revised using HUC 4 watersheds and is included in these data.

NatureServe and its member programs and collaborators use a suite of factors to assess the extinction or extirpation (regional extinction) risk of plants, animals, and ecosystems (or “elements” of biodiversity). By researching and recording information on a set of factors, biologists can assign a conservation rank to these elements at both global and regional (i.e., national/subnational) scales. The protocol for assigning a conservation rank is based on scoring an element against ten conservation factors, which are grouped into three categories based on the characteristic of the factor: rarity, trends, and threats. We chose this approach to rank the relative risk of Pacific Lamprey for various watersheds, given the lack of demographic information available across the range. Information for all ten conservation factors is not required to assign a rank. We used a modified suite of factors (seven) to assess the relative risk ranking of Pacific Lamprey by watershed throughout its range.
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2011-10 (Publication Date)
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North Pacific LCC Data Coordinator
with NPLCC

The North Pacific Landscape Conservation Cooperative promotes development, coordination, and dissemination of science to inform landscape level conservation and sustainable resource management in the face of a changing climate and related stressors