deborah cushman timothy johnson robert keys, phd department of biology, cornerstone university
DESCRIPTION
Using electronic field recordings to increase the detectability of bird species at point count sights. Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University. http:// www.flickr.com /photos/ mudhen /8591467174 /. Introduction. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/1.jpg)
Using electronic field recordings to increase the detectability of bird species
at point count sights
Deborah CushmanTimothy JohnsonRobert Keys, PhDDepartment of Biology, Cornerstone University
http://www.flickr.com/photos/mudhen/8591467174/
![Page 2: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/2.jpg)
Introduction• Monitoring of bird
populations is important in light of environmental changes
• Point counts are commonly used monitoring method
• Limitations of point counts include misidentification, training, and missed species
![Page 3: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/3.jpg)
Objectives
• We hypothesize that electronic field recordings (EFR) will show that certain bird species are often less detectable in field point counts, but that training can increase the ability of observers in the detection of these missed species.
• We predict that observer detectability will increase significantly with each point count series when EFRs are used.
• EFR’s will enable observers to increase detection of bird species having lower detection probability
![Page 4: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/4.jpg)
Methods• Pierce Cedar Creek Institute, Barry County,
Michigan– 32 Points count sites– 6 Replicates– Multiple habitats
• Equipment – Zoom H4n Field Recorder– 2 ME62 Sennheiser Omnidirectional Microphones
• Point counts – 5 minutes– Radius < 75 meters
• Analysis of EFR– Raven Pro 1.5
![Page 5: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/5.jpg)
Results
• Partially completed analysis of four series• Significant increases in observer accuracy
1 2 3 40.3
0.4
0.5
0.6
0.7
0.8
0.9
Observer Detection Accuracy
Series
Perc
enta
ge co
rrec
t det
ectio
ns
P = 0.038P = .010
P = 0.165
![Page 6: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/6.jpg)
Observers vs. EFR
1 2 3 40
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
ObserverRecorder
Series
Perc
enta
ge co
rrec
t det
ectio
ns
![Page 7: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/7.jpg)
Conclusion
• Our current analysis shows that the use of electronic field recordings can increase the detectability rate of field recorders at point count sites.
![Page 8: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/8.jpg)
Where do we go from here?
• Complete point count series 5 and 6• Analysis of detectability accuracy• Analysis of low detection bird species
![Page 9: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/9.jpg)
Acknowledgements
• Willard and Jessie Pierce Foundation• Pierce Cedar Creek Staff• Cornerstone University• Dr. Robert Keys• Brooke Kiel• Emily Finch
![Page 10: Deborah Cushman Timothy Johnson Robert Keys, PhD Department of Biology, Cornerstone University](https://reader035.vdocuments.mx/reader035/viewer/2022070419/56815c68550346895dca78ad/html5/thumbnails/10.jpg)
Questions