Cortez Mountains Nevada: 2015 Echolocation Records

Jun 1, 2020
Uploaded by Jane VanGunst
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Description:
Acoustic data was recorded for three, 1-week periods between August 21, 2016 and October 7, 2016. All detectors were programmed to begin
recording 30 minutes prior to sunset and end 30 minutes after sunrise
each day. Field checks were made throughout the duration of monitoring
to ensure proper working condition and download data.
Acoustic calls were identified to species through Kaleidoscope Pro
(version 3.1.4B). Output from Kaleidoscope Pro included species
identifications and a Maximum Likelihood Estimator (MLE) p-value that
provides an index of confidence in the species identification. Manual spot
checks of acoustic results that produced a p-value of less than 0.05 were
performed for all sites by an experienced biologist familiar with acoustic
calls of the region. In addition, all site nights with possible detections and
p-values of less than 0.05 of Townsend’s big-eared bats (Corynorhinus
townsendii) were examined by manually vetting acoustic calls.

Station A – This area is adjacent to an inactive open mine pit and is characterized by sloped, rocky terrain and shrubby vegetation. Landover in the immediate vicinity was about 50% herbaceous vegetation, 25% rock(boulders), 20% bare ground, and 5% woody vegetation. Plant species noted included rubber rabbitbrush, big sagebrush, Great Basin ryegrass, and some cheatgrass. The detector was placed on a 4 foot high curlleaf mountain mahogany shrub. This station was approximately 1,000 feet southwest of the 2014 monitoring station (ARCADIS 2014a)

Station B – This monitoring location is near a wooden frame mill (Cortez Mill) and abandoned mine shaft entrances, and a dry creek bed. This area was also monitored in 2014 (ARCADIS 2014b). The habitat consists of sagebrush with some limited riparian vegetation within the dry stream channel. The detector was originally attached to the trunk of a mature 30foot pinyon pine. Vegetation in the immediate vicinity included 50%herbaceous/shrub plants, 40% bare ground, and 10% trees. After vandalism was discovered on October 1 (SD cards were removed), the detector was moved 400 feet southwest (upslope), away from the old mill. There, the detector was attached to the trunk of a 25 foot mature pinyon pine. The site is in a dry drainage with more exposed rocky outcrops and a greater density of mixed-age pinyon pine than the original site. No riparian vegetation is present.

Station C - is located in a mature juniper and uneven-aged pinyon pine vegetation community. Trees are the dominant optical feature of the landscape and cover about 40 percent of the bare ground surface in the immediate area. The trees are widely spaced, creating open areas between which bats may forage. Big sagebrush and rabbitbrush constitute the remaining 10 percent of plant cover, reaching a maximum height of about0.5 meters (2 feet). The monitor was attached to a dead juniper stump.

Station D - This detector was placed on the edge of a stream fed pond near Willow Creek. Habitat in the vicinity of the monitor included a narrow strip of riparian vegetation that included willows, snowberry, and wood’s rose. The land cover near the pond edge was 80% shrub and herbaceous cover, 10% woody vegetation, and 10% bare ground. The rising hillsides are characterized by cheatgrass and big sagebrush. The detector was attached to a 7 foot high willow.
Data Provided By:
Penny Hunter, Bureau of Land Management, Nevada Department of Wildlife
Content date:
August - October 2015
Spatial Resolution:
10 meters
Contact Organization:
Nevada Department of Wildlife
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Use Constraints:
Creative Commons LicenseThis work is licensed under a Creative Commons Attribution 3.0 License.
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Dataset Type:
Location-Aware Spreadsheet
Conforms to Echolocation Records - 2015 Dataset Definition
By Ted Weller (Sep 18, 2015)
Capabilities:
Time Enabled
Tags:
nevada, bats, acoustic detection
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About the Uploader

Jane VanGunst
NongameBiologist with Nevada Department of Wildlife

conduct applied research and inventory and monitoring programs to promote conservation of state's wildlife resources