O’SHEA, CRYAN & BOGAN: UNITED STATES BAT SPECIES OF CONCERN 
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est among four species of bats detected using 22 parks in highly urban areas of San Francisco, Cal¬ 
ifornia, constituting about 15% of total bat passes (Krauel and LeBuhn, 2016). Activity was detect¬ 
ed in seven parks and was higher in areas closer to water and with lower proportions of native veg¬ 
etation (parks characterized by non-native plantings, such as Eucalyptus sp.; Krauel and LeBuhn, 
2016). 
Yuma myotis were the most abundant species of bat (102 individuals among 390 bats of 17 
species) captured in mist nets at 19 sites in the Sierra Nevada mountain range of California during 
1993-1999 (Pierson et al., 2001). They ranked third most common (46 captures among 284 indi¬ 
viduals of ten species) in a mist-net survey both over water and within forests (concentrating on 
groves of giant sequoia trees, Sequoiadendron giganteum ) in Yosemite National Park in the Cali¬ 
fornia Sierra Nevada Range, where the preponderance of captures was over water (Pierson et al., 
2006). They ranked tenth in relative abundance (24 of about 2,000 bats) among 13 species captured 
foraging in four vegetation zones (ranging from desert scrub to bristlecone-limber pine forests) in 
the White and Inyo Mountains of California and Nevada and were only taken in the Inyo Moun¬ 
tains on the California parts of these ranges (Szewczak et al., 1998). Most of the captures were pri¬ 
marily lactating females netted over small ponds in open, desert scrub habitat at 1,080 meters ele¬ 
vation; these bats were also observed foraging over pools at the margins of Owens Dry Lake in 
Inyo County, California (Szewczak et al., 1998). 
In Nevada, the Yuma myotis is uncommonly reported. Hall (1946) and Miller and Allen (1928) 
reported these bats only from Douglas and Washoe counties in northwestern Nevada, with a single 
specimen from along the Colorado River on the southern border of the state. One was captured 
among 1,345 bats of 13 species documented in mist nets set over very small watering sources in 
multiple habitats (but mainly desert scrub) at the Desert National Wildlife Refuge in Clark Coun¬ 
ty, southern Nevada (O’Farrell and Bradley, 1970; O’Shea et al., 2016b). This species was not cap¬ 
tured at the Nevada Test Site (among over 2,000 bats of 13 species netted over water), where habi¬ 
tats were described as Great Basin and Mojave Desert scrub (Hall, 2000). They also were not cap¬ 
tured in eastern Nevada, where 12 other species and 578 individuals were documented by mist net¬ 
ting over water and captures at abandoned mines and tunnels in six habitat zones (Ports and 
Bradley, 1996). They were not among 299 bats of 11 species captured during mist-netting surveys 
over water in west-central Nevada, where habitats were categorized in four vegetation zones 
(Kuenzi et al., 1999). Acoustic surveys in the Moapa Valley of southern Nevada indicated high use 
of riparian woodland, probably influenced in part by proximity to water; the species ranked sev¬ 
enth out of 14 based on the total time of acoustic detection (Williams et al., 2006). 
Southwestern U.S.: Arizona : This species was reported to be commonly observed foraging 
along the Colorado River through the Grand Canyon in northern Arizona but difficult to capture 
because of logistical problems (Ruffner et al., 1978). In Mohave County in western Arizona, they 
were seldom captured over small pools or ponds, ranking thirteenth in relative abundance (three 
captured among 3,458 individuals of 18 species) of species netted over such waters during 1959— 
1964 (Cockrum et al., 1996). They ranked tenth in abundance among 17 species of bats (12 cap¬ 
tured of 1,171 total bats netted) taken over water mostly in ponderosa pine and pinon-juniper habi¬ 
tats of the Arizona Strip in northwestern Arizona (Herder, 1998). These bats were rare in relative 
abundance, ranking fourteenth among 15 species netted over small ponds (ephemeral pools and 
stock tanks) and springs in ponderosa pine habitats at elevations of 2,260 to 2,620 meters in the 
Coconino National Forest in Arizona (three captures among 1,673 individuals documented; Mor¬ 
rell et al., 1999). On the Tonto National Forest in central Arizona, they ranked eighth in relative 
abundance (14 bats among 353 individuals of 15 species) in ponderosa pine forests at 1,350 to 
1,930 meters elevation along the East Verde River below the Mogollon Rim (Lutch, 1996). 
New Mexico : Yuma myotis occur in desert, grassland, and woodland zones in New Mexico, 
