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Bay Scallop Population Dynamics within Two Southwest Florida Estuaries Following Restoration Practices Utilizing Compete

Bay Scallop Population Dynamics within Two Southwest Florida Estuaries Following Restoration Practices Utilizing Competent Larval Releases. Presented by: Jay R. Leverone. PARTNERS. Jay Leverone : Mote Marine Laboratory Steve Geiger : Florida Fish & Wildlife Research Institute

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Bay Scallop Population Dynamics within Two Southwest Florida Estuaries Following Restoration Practices Utilizing Compete

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  1. Bay Scallop Population Dynamics within Two Southwest Florida Estuaries Following Restoration Practices Utilizing Competent Larval Releases Presented by: Jay R. Leverone

  2. PARTNERS • Jay Leverone: Mote Marine Laboratory • Steve Geiger: Florida Fish & Wildlife Research Institute • Bill Arnold: Florida Fish & Wildlife Research Institute • Sarah Stephenson: Florida Fish & Wildlife Research Institute • Curt Hemmel: Bay Shellfish Company • Jaime Boswell: Sanibel-Captiva Conservation Foundation • Norm Blake: University of South Florida • Peter Clark:Tampa Bay Watch

  3. Florida Bay Scallop Populations

  4. History of Florida Bay Scallop Restoration Strategies • Direct Translocation of Native Stock from Stable Populations • Planting of Hatchery-Produced Scallop Seed • Release of Hatchery-Reared Scallop Larvae

  5. Direct Translocation from Stable Populations • 1972: Scallops transferred from Anclote to Tampa Bay and placed in cages to monitor thermal effects from a power plant (USF) • 1980: Scallops translocated from Anclote to Mullet Key Bayou (USF) • 1993: Steinhatchee to Sarasota Bay (MML) • 1995: Steinhatchee to Tampa Bay (TBW) • 2002-05: Renewal of direct transplant from resurgent Anclote population (FWRI)

  6. Planting of Hatchery-Produced Scallop Seed • 1991: Free release at two sites in Tampa Bay (USF) • 1997-99: Major restoration effort from Crystal River to Tampa Bay (FWRI) • 1999: First scallop seeding effort in Sarasota Bay (MML) • 2000-01: Second, larger seeding project in Sarasota Bay (FWRI) • 2004: Seven locations within Tampa Bay (FWRI)

  7. Release of Hatchery-Reared Scallop Larvae • 2003-present: Pine Island Sound, Lee County • 2005-present: Mullet Key Bayou, Boca Ciega Bay, lower Tampa Bay

  8. Location of Tampa Bay and Pine Island Sound along the Florida west coast

  9. Larval release (●) and spat monitoring (▲) locations within each estuary

  10. Enclosure Setup

  11. Preparing Larval For Release

  12. Releasing Larvae and Monitoring Recruitment

  13. Release schedule for each estuary

  14. Spat settlement for each larval release

  15. 2003 Scallop Distribution Total = 28; Density = 1.4

  16. Restoration Site Total = 63; Density = 160 2004 Scallop Distribution Total = 21; Density = 1.05

  17. 2005 Scallop Distribution Total = 1,868; Density = 93.4

  18. 2006 Scallop Distribution Total = 163; Density = 8.15

  19. 2007 & 2008 Scallop Total = 0

  20. Scallop populations: South PIS 2004 2005 2006 2007-08

  21. Recruitment of Scallops to Background Collectors in Pine Island Sound

  22. Annual scallop abundancein Tampa Bay TBW = Tampa Bay Watch “Great Bay Scallop Search” Volunteer Survey FWRI = Fish & Wildlife Research Institute Surveys

  23. Tampa Bay Scallop Distribution2007 - 2008

  24. Recruitment of Scallops to Background Collectors in Tampa Bay

  25. Differences in Scallop Population Dynamics Between Estuaries • Pine Island Sound • Temporary resurgence in scallop abundance concurrent with 2003 restoration efforts • 2005 restoration did not show similar response • Recruitment limitation in the years following successful restoration led to population crash in 2007 • Local scallop populations are likely isolated from other west Florida populations

  26. Differences in Scallop Population Dynamics Between Estuaries • Tampa Bay • Recovery in scallop populations since 2007 coincides with larval release restoration activities • Population recovery is also coupled with high recruitment rates in lower Tampa Bay • Tampa Bay populations have maintained connectivity to adjacent coastal populations

  27. Implications for Future Restoration and Management Strategies • Need to monitor population dynamics in the smaller coastal embayments between Tampa Bay and Pine Island Sound • Pine Island Sound may require multi-level restoration plan, while Tampa Bay can utilize spat collectors for long-term seeding • Better understanding of water quality and harmful algal dynamics in Pine Island Sound will be required for ultimate recovery of scallops

  28. Funding and Support • National Sea Grant • National Oceanographic and Atmospheric Administration • Tampa Bay Estuary Program • Sarasota Bay Estuary Program • Florida Department of Environmental Protection • National Fish and Wildlife Foundation (Pinellas County Environmental Fund) • Charlotte Harbor National Estuary Program • Ocean Trust Foundation • South Florida Water Management District • Mote Scientific Foundation

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