Tim lucas-nbc
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The document describes a random encounter model for using bat detectors to estimate population sizes of bats. The model simulates bats moving at random speeds within an area scanned by a detector. Factors like detector width, echolocation range of bats, bat movement patterns, and survey time are considered. Simulations test assumptions and requirements of the model. Further field testing is suggested to validate the model for estimating real bat population densities from acoustic monitoring data.
Tim lucas-nbc
- 1. Random encounter models to estimate population sizes using bat detectors Tim C.D. Lucas & Elizabeth A. Moorcroft Robin Freeman, Marcus Rowcliffe & Kate Jones CoMPLEX, UCL @timcdlucas @statsforbios timcdlucas@gmail.com
- 2. Population size or bat passes?
- 4. Original Model Observer vt = animal speed x time Animal Yapp (1956) The theory of line transects. Bird study, 3(2):93–104.
- 5. Bats are more complicated Detector Detector Width Bat Echolocation Width
- 6. Simulations
- 8. How long to survey for? q q q q q qq q q q q q q qq q q q q q q qq q q −50 0 50 100 150 200 10 40 70 100 Captures PercentageError
- 9. Assumption: Straight line movement q q q q q q −5.0 −2.5 0.0 2.5 5.0 0° 60° 120° 180° Turning Angle PercentageError
- 10. Assumption: Constant movement q q q q q q q −3 0 3 6 0 0.5 0.75 Prop. Time Stationary PercentageError
- 13. Or I could make a web app...
- 14. Further work: Field tests
- 15. Any Questions ? Tim C.D. Lucas & Elizabeth A. Moorcroft Robin Freeman, Marcus Rowcliffe & Kate Jones @timcdlucas @statsforbios timcdlucas@gmail.com Funders: BBSRC, EPSRC, BHF Lucas, Moorcroft, Freeman, Rowcliffe, Jones, (2015), A generalised random encounter model for estimating animal density with remote sensor data. Methods in Eco. and Evo., 6:500–509.Detector Detector Width Bat Echolocation Width