Conserving Critical Stopover Habitat along the Gulf of Mexico - - PowerPoint PPT Presentation

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Conserving Critical Stopover Habitat along the Gulf of Mexico - - PowerPoint PPT Presentation

Sep 12, 2022 289 likes •549 views

Conserving Critical Stopover Habitat along the Gulf of Mexico Emily B. Cohen Jeffrey J. Buler Andrew Farnsworth Peter P. Marra Threats to Migrating Birds Gulf Coast Habitats are Essential North Americas breeding birds depend on the

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Conserving Critical Stopover Habitat along the Gulf of Mexico

Emily B. Cohen Jeffrey J. Buler Andrew Farnsworth Peter P. Marra

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Threats to Migrating Birds

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Gulf Coast Habitats are Essential

  • North America’s breeding birds

depend on the coast of the GOM for resting and refueling

  • Billions of birds congregate on

beaches, marshes, and coastal forests during spring and fall

  • Many more pass through the

airspace - also a critical habitat

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Current Status

  • Poor understanding of migrant

stopover distributions and use

  • f airspace
  • We do not know if key habitats

and sites are protected

  • We now have the tools to

measure the Gulf-wide distribution of migrants

Wetland habitat at Powderhorn Ranch, TX Scarlet tanager in coastal scrub habitat at Mad Island, TX

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Comprehensive assessment of the distribution, abundance, timing and habitat affiliations of migratory birds in stopover and airspace habitat during spring and fall along the U.S. coast of the Gulf of Mexico

Objectives

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Low angle radar

Migrant density emerging from stopover habitat

Data source Measure

Methods

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Migrant density, direction & height in airspace

High angle radar Data source Measure

Methods

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eBird

Migrant focal species distributions & richness

Data source Measure

Methods

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eBird Low angle radar

Migrant density emerging from stopover habitat Migrant density, direction & height in airspace Migrant focal species distributions & richness

High angle radar Data source Measure

Methods

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Methods: weather radar

Brownsville, TX to Key West, FL

  • Spring and Fall
  • 2008- 2015
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Preliminary results: Stopover

Very recently finished processing all the spring data. Coming soon!

Buler and Dawson 2014 Condor

Example map:

Fall migration through the Northeast U.S Interpolate bird distributions across region outside of radar coverage using predictive model

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Spatially Balanced Test Set

  • AUC = 0.89
  • Kappa = 0.57
  • Sensitivity(T+) =

0.67

  • Specificity(T-) =

0.89

Preliminary results: Airspace

−100 −95 −90 −85 −80 24 26 28 30 32 34

  • Spring diurnal and nocturnal migration

Density Direction Variation in direction

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Spatially Balanced Test Set

  • AUC = 0.89
  • Kappa = 0.57
  • Sensitivity(T+) =

0.67

  • Specificity(T-) =

0.89

Preliminary results: eBird

Yellow warbler BCR 37 Gulf Coastal Prairie Spring

Blue = Detections

April 26 Distribution

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Future Directions

  • Generate state-level maps of high priority land areas for

spring and fall migrants in the air and on land

  • Classify the threats, vulnerability, and current

conservation status of key habitats and sites

  • Measure the quality of habitats and the condition of

migrants in areas where they occur

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Critical Applications

  • Identify high priority areas for conservation of

stopover habitat and passage corridors

  • Minimize the impacts of future developments
  • Identify where to target monitoring for at risk or

declining species

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Thank You