adaptive management to conserve red knots
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Adaptive Management to Conserve Red Knots
Gregory BreeseDelaware Bay Estuary ProjectUS Fish and Wildlife Service
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
Delaware Bay Adaptive Resource Management Working Group:
Conor P. McGowan, USGS, Alabama Cooperative Fish and Wildlife Research UnitDavid R. Smith, USGS-Leetown Science CenterJames D. Nichols, USGS-Patuxent Wildlife Research CenterJulien Martin, USGS-Patuxent Wildlife Research CenterJohnA. Sweka, US Fish and wildlife Service, Northeast Fishery CenterJames E. Lyons, US Fish and Wildlife Service, Division of Migratory BirdsLawrence J. Niles, Conserve Wildlife Foundation of New JerseyKevin Kalasz, Delaware Dept. of Natural Resources and Environmental ControlRichard Wong, Delaware Dept. of Natural Resources and Environmental ControlJeffrey Brust, New Jersey Department of Environmental ProtectionMichelle Davis, Virginia Tech University, Dept. of Fisheries and Wildlife Sciences
Credits
Funding Provided by the
National Fish & Wildlife Foundation
Credits
Background
Background
Why Delaware Bay?
Background
Note: No surveys 1986-1999, incomplete survey 2001
Background
2006: U.S. Fish and Wildlife Service identifies the red knot as a candidate for Endangered Species Act protection.
Background
NJ Prohibits Harvest
Background
Spawner Survey:
Background
Storm event in 2008: “Mothers Day Nor’easter”
9-12 years for Horseshoe Crab to reach spawning age
Background
Background
SDM
Structured Decision Making Workshop June 2007
SDM
1st Joint Meeting of Crab & Shorebird Technical Committees
Problem Statement & Objectives
Maximize harvest of horseshoe crabs in the Delaware Bay with constraints that 1)harvest of female crabs is valued only when red knots exceed an abundance threshold or female horseshoe crabs exceed an abundance threshold.
2)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).
Problem/Decision Statement
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
Alternatives
Models & Consequences
Horseshoe Crab
Competing Shorebird Models
No Effect
Fecundity
Fecundity & Survival
Adaptive Stochastic Dynamic Programming
Optimization
Harvest Option 3:
500,000 males and 0 females in the Delaware Bay Population
Adaptive Management Process
ARM Decision
Matrix
Red KnotMonitoring
Horseshoe Crab Monitoring
Adaptive Management Process
ARM Decision
Matrix
Convert Regional toState Allocations
NJ Allocation
DE Allocation
MD Allocation
VA Allocation
Red KnotMonitoring
Horseshoe Crab Monitoring
Adaptive Management Process
ARM Decision
Matrix
Convert Regional toState Allocations
NJ Allocation
DE Allocation
MD Allocation
VA Allocation
Delaware Bay Shorebird & Horseshoe Crab
Populations
Red KnotMonitoring
Horseshoe Crab Monitoring
Adaptive Management Process
ARM Decision
Matrix
Convert Regional toState Allocations
NJ Allocation
DE Allocation
MD Allocation
VA Allocation
Delaware Bay Shorebird & Horseshoe Crab
Population
Red KnotMonitoring
Horseshoe Crab Monitoring
Adaptive Management Process
ARM Decision
Matrix
Convert Regional toState Allocations
NJ Allocation
DE Allocation
MD Allocation
VA Allocation
Delaware Bay Shorebird & Horseshoe Crab
Population
Red KnotMonitoring
Horseshoe Crab Monitoring
Models Performance
No EffectFecundity & Survival
Fecundity
Monitoring: How well do Models Perform?
Two Key Monitoring Needs:
1) Horseshoe Crab Trawl Survey
2) Red Knot Marked-Unmarked Ratio
www.asmfc.org
Questions?
Gregory BreeseDelaware Bay Estuary ProjectUS Fish and Wildlife Service