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Adaptive Management to Conserve Red Knots

Adaptive Management to Conserve Red Knots. Gregory Breese Delaware Bay Estuary Project US Fish and Wildlife Service. Credits. FWS Programs: Fisheries Ecological Services – Coastal Ecological Services – Endangered Species Migratory Birds – R5 Migratory Birds – WO Key External Partners

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Adaptive Management to Conserve Red Knots

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  1. Adaptive Management to Conserve Red Knots Gregory Breese Delaware Bay Estuary Project US Fish and Wildlife Service

  2. Credits • FWS Programs: • Fisheries • Ecological Services – Coastal • Ecological Services – Endangered Species • Migratory Birds – R5 • Migratory Birds – WO • Key External Partners • Atlantic States Marine Fisheries Commission • United State Geological Survey • New Jersey Department of Environmental Protection • Delaware Dept of Natural Resources and Environmental Control • Conserve Wildlife Foundation of New Jersey • Virginia Polytechnic Institute and State University • British Trust for Ornithology

  3. Credits Delaware Bay Adaptive Resource Management Working Group: Conor P. McGowan, USGS, Alabama Cooperative Fish and Wildlife Research Unit David R. Smith, USGS-Leetown Science Center James D. Nichols, USGS-Patuxent Wildlife Research Center Julien Martin, USGS-Patuxent Wildlife Research Center JohnA. Sweka, US Fish and wildlife Service, Northeast Fishery Center James E. Lyons, US Fish and Wildlife Service, Division of Migratory Birds Lawrence J. Niles, Conserve Wildlife Foundation of New Jersey Kevin Kalasz, Delaware Dept. of Natural Resources and Environmental Control Richard Wong, Delaware Dept. of Natural Resources and Environmental Control Jeffrey Brust, New Jersey Department of Environmental Protection Michelle Davis, Virginia Tech University, Dept. of Fisheries and Wildlife Sciences

  4. Credits Funding Provided by the National Fish & Wildlife Foundation

  5. Background

  6. Background Why Delaware Bay?

  7. Background

  8. Background Note: No surveys 1986-1999, incomplete survey 2001

  9. Background 2006: U.S. Fish and Wildlife Service identifies the red knot as a candidate for Endangered Species Act protection.

  10. Background NJ Prohibits Harvest

  11. Spawner Survey: Background Storm event in 2008: “Mothers Day Nor’easter”

  12. Background 9-12 years for Horseshoe Crab to reach spawning age

  13. Background

  14. SDM Structured Decision Making Workshop June 2007

  15. SDM

  16. 1st Joint Meeting of Crab & Shorebird Technical Committees

  17. Problem Statement & Objectives

  18. Problem/Decision Statement • Maximize harvest of horseshoe crabs in the Delaware Bay with constraints that • harvest of female crabs is valued only when red knots exceed an abundance threshold or female horseshoe crabs exceed an abundance threshold. • Harvest of males is valued only when males do not limit horseshoe crab reproduction (conversely, horseshoe crab population growth rate will not • increase with additional males in the population).

  19. Alternatives • 1) full moratorium on both sexes • 2) 250,000 males and 0 females • 3) 500,000 males and 0 females • 4) 280,000 males and 140,000 females • 5) 420,000 males and 210,000 females

  20. Models & Consequences Fecundity & Survival Horseshoe Crab Competing Shorebird Models No Effect Fecundity

  21. Adaptive Stochastic Dynamic Programming

  22. Optimization Harvest Option 3: 500,000 males and 0 females in the Delaware Bay Population

  23. Adaptive Management Process ARM Decision Matrix Red Knot Monitoring Horseshoe Crab Monitoring

  24. Adaptive Management Process Convert Regional to State Allocations NJ Allocation ARM Decision Matrix DE Allocation MD Allocation VA Allocation Red Knot Monitoring Horseshoe Crab Monitoring

  25. Adaptive Management Process Convert Regional to State Allocations NJ Allocation ARM Decision Matrix DE Allocation MD Allocation VA Allocation Red Knot Monitoring Delaware Bay Shorebird & Horseshoe Crab Populations Horseshoe Crab Monitoring

  26. Adaptive Management Process Convert Regional to State Allocations NJ Allocation ARM Decision Matrix DE Allocation MD Allocation VA Allocation Red Knot Monitoring Delaware Bay Shorebird & Horseshoe Crab Population Horseshoe Crab Monitoring

  27. Adaptive Management Process Convert Regional to State Allocations NJ Allocation ARM Decision Matrix DE Allocation MD Allocation VA Allocation Red Knot Monitoring Delaware Bay Shorebird & Horseshoe Crab Population Horseshoe Crab Monitoring

  28. Models Performance Fecundity Fecundity & Survival No Effect

  29. Monitoring: How well do Models Perform? Two Key Monitoring Needs: 1) Horseshoe Crab Trawl Survey 2) Red Knot Marked-Unmarked Ratio

  30. www.asmfc.org

  31. Questions? Gregory Breese Delaware Bay Estuary Project US Fish and Wildlife Service

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