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Federal Register / Vol. 86, No. 89 / Tuesday, May 11, 2021 / Rules and Regulations
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bulrush has little population abundance information available across its range.
The best available demographic data do not allow us to evaluate the ability of Halls bulrush populations to withstand demographic stochastic events. Annual variation in timing and duration of rain events mean that Halls bulrush populations are cyclic and dependent on water fluctuations. Therefore, we assessed the population status based on the condition of the habitat, including the presence of potential hybridizing plants. We made the assumption that healthy habitat, i.e., higher habitat metric scores on the Environmental Protection Agencys Watershed Index Online tool and higher average scores of the Natural Resources Conservation Service depth to water table will support a healthy population of Halls bulrush.
Despite impacts from the primary stressors, the species has maintained populations throughout its range in multiple ecoregions. We anticipate sufficient quality and quantity of habitat to support the viability of the species for the foreseeable future. Halls bulrush currently has healthy moderately or highly resilient populations across its range 32 extant populations across seven ecoregions. The species representation among ecoregions has not changed significantly between the historical and most recent surveys.
Halls bulrush has retained redundancy and we project it to be maintained into the future based on multiple resilient populations being spread across its historical range in seven ecoregions.
Based on these conditions, the Halls bulrush current risk of extinction is very low. Although we predict some continued impacts from these stressors in the future, we anticipate the species will continue to maintain resilient populations into the foreseeable future throughout its range and that are distributed widely throughout each of
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its ecoregions representative units.
Therefore, we find that listing Halls bulrush as an endangered species or threatened species under the Act is not warranted. A detailed discussion of the basis for this finding can be found in the Halls bulrush species assessment form and other supporting documents see ADDRESSES, above.
Triangle Pigtoe Previous Federal Actions On June 25, 2007, the Service received a petition dated June 18, 2007, from Forest Guardians now WildEarth Guardians requesting that the Service list 475 species, including the triangle pigtoe formerly Fusconaia lananensis, as endangered or threatened species and designate critical habitat under the Act.
On December 16, 2009, the Service published a 90-day finding 74 FR
66866 on 192 of the 475 species and stated that the petition presented substantial scientific information indicating that listing may be warranted for 67 of the 192 species, including the triangle pigtoe. As a result, the Service initiated status reviews for all 67
species.
Summary of Finding We have carefully assessed the best scientific and commercial information available regarding the triangle pigtoe and evaluated the petitions claims that the species warrants listing under the Act. Genetic and morphometric analyses indicate that the triangle pigtoe is synonymous with the wider-ranging Texas pigtoe Fusconaia askewi. These studies have been accepted by the relevant scientific community, including NatureServe, the Freshwater Mollusk Conservation Society, Texas Parks and Wildlife Department, and the Service. Therefore, the triangle pigtoe is not a valid taxonomic entity; does not meet the definition of a species or subspecies under the Act; and, as a
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result, does not warrant listing under the Act. A detailed discussion of the basis for this finding can be found in the triangle pigtoe species assessment form and other supporting documents see ADDRESSES, above.
New Information We request that you submit any new information concerning the taxonomy of, biology of, ecology of, status of, or stressors to Halls bulrush or triangle pigtoe to the appropriate person, as specified under FOR FURTHER
INFORMATION CONTACT, whenever it becomes available. New information will help us monitor these species and make appropriate decisions about their conservation and status. We encourage local agencies and stakeholders to continue cooperative monitoring and conservation efforts.
References Cited A list of the references cited in this petition finding is available on the internet at http www.regulations.gov in the species assessment form or in the appropriate docket provided above in ADDRESSES and upon request from the appropriate person, as specified under FOR FURTHER INFORMATION CONTACT.
Authors The primary authors of this document are the staff members of the Species Assessment Team, Ecological Services Program.
Authority The authority for this action is section 4 of the Endangered Species Act of 1973, as amended 16 U.S.C. 1531 et seq..
Martha Williams, Principal Deputy Director, Exercising the Delegated Authority of the Director. U.S. Fish and Wildlife Service.
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