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PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Series 4, Volume 65, Supplement I 
particularly riparian areas, from about 1,220 to 2,134 meters in elevation (Findley et al., 1975). 
They were uncommon (ranking eleventh of 15 species, with 13 among 1,532 individuals) in the 
Jemez Mountains of New Mexico at netting sites limited to small ponds that ranged from 1,835 to 
2,729 meters in elevation (Bogan et al., 1998). Echolocation activity of these bats was commonly 
detected only in riparian and previously (20 years) intensely burned ponderosa pine habitats in the 
Jemez Mountains (Ellison et al., 2005). They were low to intermediate in abundance, ranking sev¬ 
enth among 16-17 species (20 captures out of 855 individuals) in mist netting over ponds during 
1970 at Nogal Canyon, Socorro County, in habitats described as pinon-juniper, pine-oak wood¬ 
lands, and mixed-conifer forest (Black, 1974). One individual was captured over a stock pond in 
pinon-juniper woodlands (among 1,222 bats of 10-11 species) in the Gallinas Mountains, and none 
were captured in ponderosa pine forests of the nearby San Mateo Mountains (among 447 bats of 
seven to eight species; Chung-MacCoubrey, 2005). At higher elevations in the San Mateo Moun¬ 
tains (ponderosa pine or mixed Douglas fir-blue spruce forests), none were captured in mist nets 
(among 1,390 bats of 10-11 species) during 19 years of sampling over a 34-year period at a natu¬ 
ral pool in a canyon floor (Geluso and Geluso, 2012). 
Also in northern New Mexico, one Yuma myotis (ranking least in relative abundance) was cap¬ 
tured among 302 bats of 10-11 species netted in mostly ponderosa pine habitat at 2,600 to 2,885 
meters on Mount Taylor (Geluso, 2008). In contrast, at a nearby lower elevation near running 
water, this species ranked third in relative abundance (22 bats captured) in a survey that docu¬ 
mented six species and 130 individuals netted over water along the middle Rio Grande in the 
Bosque Del Apache National Wildlife Refuge of central New Mexico (Chung-MacCoubrey, 1999). 
Somewhat farther south, Jones (2016) documented bats captured during surveys of various habi¬ 
tats in the Greater Gila region of Catron, Grant, and Sierra Counties of New Mexico; Yuma myotis 
ranked sixth in abundance, with 17 captures among 282 individuals of 16-17 species (Jones, 2016; 
including data from unpublished reports of others). They ranked fourth in relative abundance (a 
total of 137) among 1,595 bats of 20 species taken in the Mogollon Mountains of western New 
Mexico and adjacent Arizona, where they were mostly captured at elevations below 1,829 meters 
(Jones, 1965). In a separate analysis limited to three sites over water in western New Mexico and 
including additional years of sampling, this species ranked tenth of 19 species (14 captures among 
1,004 individuals), and were only taken in riparian hardwoods within mesquite-juniper woodlands 
at 1,465 meters (Jones and Suttkus, 1972). A survey that took place at 37 sites across several habi¬ 
tat types in much of New Mexico in 2006 yielded 1,752 bats of 21 species with 54 Yuma myotis, 
ranking tenth in relative abundance (Geluso, 2006, 2017). 
Texas:. At Big Bend National Park in Texas, Yuma myotis were most common at lower ele¬ 
vations along the Rio Grande. During 1967-1971 they ranked seventh in relative abundance at Big 
Bend, with 384 captures among 4,807 captures of 18 species (Easterla, 1973). Subsequent surveys 
at Big Bend during 1996-1998 found them to rank eighth in relative abundance (46 among 1,978 
captures of 17 species), with most captures concentrated over open water of the Rio Grande (Hig¬ 
ginbotham and Ammerman, 2002). They ranked eleventh among 14 species (two out of 542 indi¬ 
viduals) captured in mist nets at 108 locations over water in northern Chihuahuan desert habitats 
described as desert scrub, desert grassland, riparian, and juniper roughland at Big Bend Ranch State 
Park, northwest and upstream of the national park in the Trans-Pecos region of Texas; existence of 
roosts in the region led investigators to suggest greater abundance than indicated by capture fre¬ 
quency (Yancey, 1997). This species was not documented in a mist net survey where 1,329 indi¬ 
viduals in 12 species were captured at Palo Duro Canyon State Park in the Texas Panhandle (Riedle 
and Matlack, 2013), somewhat beyond the edge of the known distribution (Ammerman et al., 
2012a; Braun et al., 2015). 
Central Rocky Mountains and Western Great Plains: Colorado: In Colorado, this species 
