Federal Register - March 8, 2021
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Source: Federal Register
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Federal Register / Vol. 86, No. 43 / Monday, March 8, 2021 / Rules and Regulations
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a defined pollinator flight distance of 3
kilometers km 2 miles mi of each other. The current population estimate is the combined count data from all sites; for some sites the plant count was the result of a full census 54 sites, while for others it was derived by visual estimate or calculated from count subsamples that were then extrapolated over the total area of the site 17 sites.
The increase in known populations and number of plants over time is due to a combination of population augmentation and introductions, improved habitat management, and increased survey effort across the range of the species. Bradshaws lomatium has been the focus of concentrated recovery efforts since it was listed in 1988. We now estimate there are likely more plants across the range of Bradshaws lomatium than we have accounted for because not all areas of suitable habitat
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within the range of the species have been surveyed, and recent visits to previously unsurveyed areas have resulted in the identification of formerly unknown populations e.g., Service 2018, p. 10.
In our SSA report, we evaluated and ranked the resiliency of each population of Bradshaws lomatium using the following criteria: 1 Population size, 2 current habitat conditions, 3
protection of the site from development, and 4 site management to restore and maintain appropriate habitat condition.
Using these criteria, each population was given a rank of high, moderate, or low condition Service 2018, pp. 2630.
The resiliency score for each population incorporates the degree to which the primary threats to the species have been addressed at each site as well as recovery criteria population size and habitat quality, site protection
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addressing habitat loss, and site management addressing woody encroachment and invasive species. For details on evaluation and ranking of population condition, see the SSA
report Service 2018, pp. 2643.
The table below summarizes our current knowledge of the abundance and distribution of Bradshaws lomatium relative to the downlisting and delisting criteria presented in the recovery plan for the species from Service 2018, p. 39, updated based on Wilderman 2018, entire. Because the table below summarizes only the abundance and distribution data for the species, the information in the table must be considered in conjunction with the five-factor analysis of threats to arrive at the status determination for Bradshaws lomatium.
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