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Federal Register / Vol. 86, No. 199 / Tuesday, October 19, 2021 / Proposed Rules Joaquin River and Big Creek are immediately north of the unit. Lands within this unit include approximately 46,123 ac 18,665 ha; 76 percent in Federal ownership Sierra National Forest, USFS and 14,900 ac 6,030 ha;
24 percent in private ownership. Of the private lands in this unit, we are considering excluding 10,254 ac 4,150
ha owned by Southern California Edison Company based on their forest management practices that are compatible with fisher conservation by providing suitable fisher habitat and reducing threats to the DPS. General land use within this unit includes forest management e.g., timber harvest, fuels reduction, hazard tree management, forest restoration, prescribed fire, grazing, recreation, and residential development.
Unit 4 is occupied by the fisher and contains the physical and biological feature essential to the conservation of the species. This unit is located between the areas with high occupancy rates to the south and the recently re-colonized areas to the north, indicating the habitat in this unit is essential for continued population and range expansion.
Approximately 3,089 ac 1,250 ha of the unit overlap with designated critical habitat for the federally threatened Yosemite toad see 50 CFR 17.95d and 81 FR 59046, August 26, 2016.
Threats identified within this unit include wildfire and wildfire suppression; climate change; tree mortality from drought, disease, and insect infestation; vegetation management; exposure to toxicants;
potential for effects associated with small population size; disease and predation; and vehicle collisions.
Special management considerations or protection measures to reduce or alleviate the threats may include: 1
Implementing forest management practices, especially the use of prescribed fire, that reduce the risk of catastrophic wildfire and improve habitat resiliency in and adjacent to fisher habitat; 2 minimizing habitat disturbance, fragmentation, and destruction at the stand scale, homerange scale, and landscape scale from vegetation management activities through the use of conservation measures; 3 preventing, locating, and remediating trespass marijuana grow sites and other sources of toxicants; and 4 improving the efficacy of existing road-crossing structures and installing new wildlife road crossings on major roadways. Federal lands in this unit are managed under the Sierra Nevada Forest Plan Amendment USFS 2004, entire.

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Unit 5: North Sierra Unit 5 consists of 147,230 ac 59,582
ha of lands in the Sierra Nevada mountains in Madera and Mariposa Counties, California. Unit 5 lies north and west of the San Joaquin River, east of Bass Lake and California State Route 49, and south of the Merced River and the unincorporated community of El Portal. Lands within this unit include approximately 106,240 ac 42,994 ha; 72
percent managed by USFS Sierra National Forest, 31,008 ac 12,548 ha;
21 percent managed by NPS Yosemite National Park, 157 ac 64 ha; less than 1 percent managed by BIA a public domain allotment held in trust status;
not affiliated with a recognized Tribe, and 25 ac 10 ha; less than 1 percent managed by BLM. Also, there are 9,800
ac 3,966 ha; 7 percent in private ownership. General land use within this unit includes forest management e.g., timber harvest, fuels reduction, hazard tree management, forest restoration, prescribed fire, grazing, recreation, and residential development.
Unit 5 is occupied by the fisher and contains the physical and biological feature essential to the conservation of the species. This unit supports relatively high predicted habitat quality with a high proportion of shade-tolerant incense cedar and white fir that fishers use for denning and resting Spencer et al. 2015, p. 49. This unit was recently re-colonized in the 1990s Tucker et al.
2014, p. 131, and its habitat is essential to support the species continued northern expansion. Approximately 129
ac 52 ha of the unit overlap with designated critical habitat for the federally threatened Yosemite toad see 50 CFR 17.95d and 81 FR 59046, August 26, 2016.
Threats identified within this unit include wildfire and wildfire suppression; climate change; tree mortality from drought, disease, and insect infestation; vegetation management; exposure to toxicants;
potential for effects associated with small population size; disease and predation; and vehicle collisions.
Special management considerations or protection measures to reduce or alleviate the threats may include: 1
Implementing forest management practices, especially the use of prescribed fire, that reduce the risk of catastrophic wildfire and improve habitat resiliency in and adjacent to fisher habitat; 2 minimizing habitat disturbance, fragmentation, and destruction at the stand scale, homerange scale, and landscape scale from vegetation management activities through the use of conservation
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measures; 3 preventing, locating, and remediating trespass marijuana grow sites and other sources of toxicants; and 4 improving the efficacy of existing road-crossing structures and installing new wildlife road crossings on major roadways. Federal lands in this unit are managed under the Sierra Nevada Forest Plan Amendment USFS 2004, entire, Yosemite National Park General Management Plan NPS 1980, entire, and Approved Resource Management Plan for the Bakersfield Field Office BLM 2014, entire.
Unit 6: Stanislaus Unit 6 consists of 53,102 ac 21,490
ha of lands in the Sierra Nevada mountains in Mariposa and Tuolumne Counties, California. Unit 6 is situated between the Merced River to the south and the Tuolumne River to the north, with Buck Meadows to the west and Tamarack Flat and Aspen Valley to the east. Lands within this unit include approximately 30,209 ac 12,225 ha; 57
percent managed by USFS Stanislaus National Forest and 22,096 ac 8,942
ha; 42 percent managed by NPS
Yosemite National Park. Also, there are 798 ac 323 ha; 2 percent in private ownership. General land use within this unit includes forest management e.g., timber harvest, fuels reduction, hazard tree management, forest restoration, prescribed fire, grazing, recreation, and residential development.
Unit 6 is occupied by the fisher and contains the physical and biological feature essential to the conservation of the species. This unit represents the northernmost extent of the species current range and was recently recolonized over the previous decade, with possible evidence of reproduction documented for the first time in 2020
Stock 2021, pers. comm.. This northward expansion and establishment of a subpopulation north of the Merced River improves the redundancy of the DPS.
Threats identified within this unit include wildfire and wildfire suppression; climate change; tree mortality from drought, disease, and insect infestation; vegetation management; exposure to toxicants;
potential for effects associated with small population size; disease and predation; and vehicle collisions.
Special management considerations or protection measures to reduce or alleviate the threats may include: 1
Implementing forest management practices, especially the use of prescribed fire, that reduce the risk of catastrophic wildfire and improve habitat resiliency in and adjacent to fisher habitat; 2 minimizing habitat
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