A random encounter model for estimating bat abundances random encounter model for estimating bat...

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Transcript of A random encounter model for estimating bat abundances random encounter model for estimating bat...

  • A random encounter model forestimating bat abundances

    Tim C.D. Lucas@timcdlucas

    CoMPLEX, GEEUniversity College London

    22-03-2013 #BritBats

  • A digression to begin with...

  • How many bats are there?

  • A random encounter modelAlso known as a gas model

  • A random encounter modelAlso known as a gas model

  • Bats arent circlesTheyre segments

    1

    2

  • Some assumptions

    Discrete inside/outside of call segment

    Probably more probabilistic than this

  • Some assumptions

    Straight line movement

    Number of detections is Poisson

  • Are detections Poisson?

    100% 50% 5% 2%

    Bat

    spe

    rKM

    2

    01

    23

    45

    6

    Percent of Ukraine P. kuhlii sample size

    Estimate and theoretical CIBootstrap mean and CI

  • SimulationsWith Liz Moorcroft

  • Compare model sensitivity:

    - Species parameters- Movement models- Population density

  • Required parameters

    Species Eptesicus serotinus

    Call intensity 128dBHalf amplitude angle 36

    Flight speed 13.2ms1

    Call frequency 26.94kHz

    Bat detector

    SensitivityAngle of operation

  • Required parameters

    Species Eptesicus serotinus

    Call intensity 128dBHalf amplitude angle 36

    Flight speed 13.2ms1

    Call frequency 26.94kHz

    Bat detector

    SensitivityAngle of operation

  • Required parameters

    Species Eptesicus serotinus

    Call intensity 128dBHalf amplitude angle 36

    Flight speed 13.2ms1

    Call frequency 26.94kHz

    Bat detector

    SensitivityAngle of operation

  • Thanks for listening@timcdlucas

  • 1

    2

    D =capture

    zq

    q =r

    (2

    /2(a)/2

    sina2sin 1

    va2 + vd2 2vavd cos

    2d1

    +

    a+d/2a

    sin 2

    va2 + vd2 2vavd cos

    2d2

    )