Assessing Bat Detectability and Occupancy with Multiple Automated Echolocation Detectors

Gorresen, P. Marcos; Miles, Adam C.; Todd, Christopher M.; Bonaccorso, Frank J.; Weller, Theodore J.

doi:10.1644/07-mamm-a-022.1

Cited by 67 publications

(59 citation statements)

References 22 publications

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“…Bat activity is often assessed by the number of bat passes (i.e., files recorded by bat detectors; Hayes, 1997) however this metric is susceptible to the arbitrary partitioning of potentially continuous activity (Gorresen et al, 2008). We quantified the magnitude of echolocation activity by determining the number of calls (or pulses) recorded at each site for each night using Analook (Hayes, 2000).…”

Section: Call Analysismentioning

confidence: 99%

“…We quantified the magnitude of echolocation activity by determining the number of calls (or pulses) recorded at each site for each night using Analook (Hayes, 2000). The use of the number of calls directly measures the magnitude of calling activity and may be less prone to measurement error caused by missed calls (e.g., bat detector orientation and distance, ambient noise; Gorresen et al, 2008) and is similar to that of using file size as a measure of activity (Broders, 2003).…”

Section: Call Analysismentioning

confidence: 99%

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Loss of forest cover impacts the distribution of the forest-dwelling tri-colored bat (Perimyotis subflavus)

Farrow¹,

Broders²

2011

Mammalian Biology

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a b s t r a c tFragmentation of landscapes and the loss of species' habitat by the expansion and intensification of human land use are major threats to global biological diversity, making it important to quantitatively characterize species' distributions and resource requirements at multiple spatial scales. To examine the impact of landscape structure on the distribution of forest-dwelling bats, we examined the effects of these factors on the distribution and activity patterns of tri-colored bats (Perimyotis subflavus) in Nova Scotia, Canada. In Nova Scotia maternity colonies of the tri-colored bat use clumps of Usnea spp. lichen for roosting, typically in mature spruce trees. In 2005 and 2006, we used Anabats to assess tri-colored bat activity at 90 river sites in southwest Nova Scotia. The results of echolocation monitoring indicate that the tri-colored bat occurs within a minimum area of 10,020 km 2 . The best landscape predictor of the magnitude of tri-colored activity was non-forested land area within commuting distance of survey sites, suggesting that tri-colored bats were less active in landscapes where forests are cleared for agriculture, settlements and timber production. Therefore, this is an example of a forest-associated bat that seems to be negatively impacted by landscape practices that reduce the spatial extent of forests.

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Section: Call Analysismentioning

confidence: 99%

Section: Call Analysismentioning

confidence: 99%

Loss of forest cover impacts the distribution of the forest-dwelling tri-colored bat (Perimyotis subflavus)

Farrow¹,

Broders²

2011

Mammalian Biology

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“…The resulting false absences (species is present but not detected; MacKenzie, 2005) may influence results and inferences unless accounted for in analyses (Gu and Swihart, 2004). Because bats are imperfectly detected and detection may be influenced by habitat characteristics, occupancy modeling has recently been applied to acoustic surveys for bats (Amelon, 2007;Gorreson et al, 2008;Hein et al, 2009;Weller and Baldwin, 2012;Yates and Muzika, 2006). Occupancy modeling allows simultaneous investigation of factors influencing occupancy and detection probabilities, improving the ability to make inferences about species use of landscape features (MacKenzie et al, 2002;MacKenzie, 2005).…”

Section: Introductionmentioning

confidence: 99%

Site occupancy of foraging bats on landscapes of managed pine forest

Bender

Castleberry

Miller

et al. 2015

Forest Ecology and Management

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“…Additionally, bat detectors can detect more species at a site than capture techniques (Murray et al 1999;O'Farrell and Gannon 1999). Further, ultrasonic detectors can be deployed to passively record the echolocation calls of bats without an observer present, thereby allowing a small crew to sample multiple sites simultaneously and for long periods of time (e.g., Gorresen et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Effects of Orientation and Weatherproofing on the Detection of Bat Echolocation Calls

Britzke

Slack

Armstrong

et al. 2010

Journal of Fish and Wildlife Management

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Ultrasonic detectors are powerful tools for the study of bat ecology. Many options are available for deploying acoustic detectors including various weatherproofing designs and microphone orientations, but the impacts of these options on the quantity and quality of the bat calls that are recorded are unknown. We compared the impacts of three microphone orientations (horizontal, 45u, and vertical) and two weatherproofing designs (polyvinyl chloride tubes and the BatHat) on the number of calls detected, call quality, and species detected by the Anabat II bat detector system at 17 sites in central Kentucky in May and June 2008. Detectors with BatHat weatherproofing recorded significantly fewer call sequences, pulses per file, species per site, and lower quality calls. Detectors in the horizontal position also tended to record fewer files, fewer species, and lower quality calls. These results illustrate potential impacts of deployment method on quality and quantity of data obtained. Because weatherproofing and orientation impacted the quality and quantity of data recorded, comparison of results using different methodologies should be made with caution.

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Assessing Bat Detectability and Occupancy with Multiple Automated Echolocation Detectors

Cited by 67 publications

References 22 publications

Loss of forest cover impacts the distribution of the forest-dwelling tri-colored bat (Perimyotis subflavus)

Loss of forest cover impacts the distribution of the forest-dwelling tri-colored bat (Perimyotis subflavus)

Site occupancy of foraging bats on landscapes of managed pine forest

Effects of Orientation and Weatherproofing on the Detection of Bat Echolocation Calls

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