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American Oystercatcher aerial survey 2012/2013

American Oystercatcher aerial survey 2012/2013. American Oystercatcher Working Group. Aerial survey. Timeframe: January/early February 2013 Follows protocol from 2003 survey with key modifications Survey windows: Jan 1-7, Jan 15-20, Jan 28-Feb 6 (Atlantic Coast)

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American Oystercatcher aerial survey 2012/2013

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  1. American Oystercatcher aerial survey 2012/2013 American Oystercatcher Working Group

  2. Aerial survey • Timeframe: January/early February 2013 • Follows protocol from 2003 survey with key modifications • Survey windows: • Jan 1-7, Jan 15-20, Jan 28-Feb 6 (Atlantic Coast) • Jan 7-12, Jan 21-Feb 4 (Gulf Coast) • Designed to be a complete survey of the AMOY winter range in the US, completed in a short time window • Simultaneous coverage of Atlantic and Gulf coasts

  3. Protocol • Estimates of flock size • Stratified sampling • Aerial photography (Digital SLR, 6.1 MP, 300 mm image stabilized lens) for detection rate within flocks • Ground counts for flock detection rates • Survey window High Tide +/- 2 Hours • Pre and post survey window flights to estimate detection rates for both observers

  4. Boat/ground surveys • Surveys on same tide cycle as aerial survey • Observers will record flock size, GPS location, time, and roost substrate type • Record GPS track • Complete statewide surveys not required –Surveys will cover a well defined area on the same tide cycle as the aerial survey

  5. Survey Strata • High quality habitat types • Known roost sites • Shell rakes, sand spits, etc. • Complete survey of all locations identified • Intertidal marsh habitats • Marsh edges • Random subsample surveyed completely • Flight track recorded to quantify coverage • Barrier beach habitats • Survey all in random blocks • Flight track recorded to quantify coverage

  6. Detection Rates • Detection rate for flocks • Calculated from ground counts • Applied to high quality habitat areas with no ground counts • Detection rate for birds within flocks • Calculated with photographs • Applied to high quality habitat area flocks with no photograph

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