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Federal Register / Vol. 86, No. 166 / Tuesday, August 31, 2021 / Rules and Regulations TABLE 1BARTRAMS STONECROP CURRENT POPULATION RESILIENCYContinued Sky island
Dragoon

Empire
Mule
Pajarito-Atascosa

Patagonia
Rincon

Santa Rita

Whetstone

khammond on DSKJM1Z7X2PROD with RULES

Sierra Las Avispas, Sonora
Sierra La Escuadra, Chihuahua
Sierra La Estancia, Chihuahua

Bartrams Stonecrop Representation No genetic studies have been conducted within or among the 53
Bartrams stonecrop historical populations in southern Arizona and Mexico. Mountain ranges that have only one or two populations, or have only one subpopulation per population, or low numbers of individuals per population with several miles between mountain ranges, may not be as genetically diverse because pollination or transport of seeds between populations may be very limited or nonexistent. Some genetic exchange likely occurs within populations containing many subpopulations,
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Number of individuals
Population
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Indian Creek
Carlink Canyon
Jordan Canyon
Sheephead
Slavin Gulch
Stronghold Canyon East
Stronghold Canyon West
Empire Mountains
Juniper Flat
Alamo Canyon
Holden Canyon
Sycamore Canyon
Warsaw Canyon
Alum Gulch
Flux Canyon
Bear Creek
Chimenea-Madrona Canyon
Chimenea Canyon Side Branch
Distillery
Happy Valley North
Happy Valley South
Italian Spring Canyon
North Branch Turkey Creek
Posta Quemada
Rincon Creek
Rincon Peak
Shaw Canyon
South Branch Turkey Creek
Tanque Verde Ridge Trail
Tres Pipas Canyon
West Branch Deer Creek
Adobe Canyon
Bond Canyon
Cave Canyon
Gardner Canyon East
Gardner Canyon West
Josephine Canyon
Madera Canyon
Sawmill Canyon
Squaw Gulch
Sycamore Canyon
Temporal Gulch
Walker Canyon
Deathtrap Canyon
French Joe Canyon
Guindani Canyon
Sierra Las Avispas
Near Colonia Pacheco
Cuarenta Casas

groups, or in populations with high abundance.
However, Bartrams stonecrop may exhibit some level of genetic diversity in response to elevational and other environmental variation between locations. The species occurs on multiple substrate types and at a range of elevations 3,500 to 6,800 feet, providing potential for local adaptation and genetic differentiation among populations. This range in elevation provides a variety of climatic conditions for the species to inhabit. Due to the loss of four populations, it is possible that there has been a loss of genetic diversity.

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0
0 415
45
9 388
557
0 798
134
9 313
13
52
123
171
29
35
3 1
41
30
11
3 38
2 19
7 90
4 10
82
51
50
10
14
76
145
36
55
115
27
19
135
87
3 2
46
10

Current resiliency Extirpated.
Extirpated.
Moderate.
Moderate.
Moderate.
Moderate.
High.
Extirpated.
Moderate.
Moderate.
Low.
High.
Moderate.
Moderate.
Moderate.
Moderate.
Low.
Moderate.
Moderate.
Low.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Moderate.
Low.
Moderate.
Low.
Low.
Low.

In three populations, plants have been reported over many decades, indicating that these populations may have the genetic and environmental diversity to adapt to changing conditions. The species currently occurs across 50
populations in 12 mountain ranges;
therefore, we expect some level of genetic diversity exists among mountain ranges.
Bartrams Stonecrop Redundancy Bartrams stonecrop populations in the United States and Mexico are naturally fragmented between mountain ranges. Currently, 50 extant Bartrams stonecrop populations are spread across
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