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Field methods lab

Field methods lab. Auditory Point counts Simulated point counts using Bird Radio equipment Identify and map “birds” by song Need to know: Acadian Flycatcher Wood Thrush Black-throated Green Warbler Winter Wren We will do three counts with increasing complexity

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Field methods lab

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  1. Field methods lab • Auditory Point counts • Simulated point counts using Bird Radio equipment • Identify and map “birds” by song • Need to know: • Acadian Flycatcher • Wood Thrush • Black-throated Green Warbler • Winter Wren • We will do three counts with increasing complexity • You will compare your results with the true location and species maps • Consider factors that affect detection and identification on real point counts

  2. Field methods lab • Visual point count – Independent double observer method • Pairs of observers scan for colored targets representing different bird species • Map the location of each target on your datasheet • Compare datasheets with your partner after the count period • Match observations in common • For each “species” record the number of individuals seen by each observer and the number seen in common

  3. SR LR SB SR LB LB

  4. Field methods lab • Data Summary • Each pair of observers will summarize their double observer data on the data sheets provided and email them to Shiloh as an Excel file by the end of day on Friday • For each “species” in each habitat • n1 (number of individuals seen by the first observer) • n2 (number of individuals seen by the second observer) • m2 (number of individuals seen in common) • Shiloh will compile the data and post it online with an Excel worksheet • Use the Lincoln-Peterson equations in the worksheet to estimate population size and detection probability for each “species” in each habitat

  5. Field methods lab n1 = number of individuals seen by the first observer n2 = number of individuals seen by the second observer m2 = number of individuals seen by both observers N = estimated population size V(N) = variance of N p1 = detection probability for observer 1 p2 = detection probability for observer 2

  6. Field methods lab • Write-up • A summary of your results, including average population estimate and detection probability for each species from each habitat • A comparison of your results to the true results, as well as to other members of your lab • A discussion of the factors that affected your ability to detect "birds" on auditory and visual counts • Your thoughts about other factors that may affect detection probabilities on real point counts • ~ 1-2 pages

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