American Oystercatcher Management in Florida

1. American Oystercatcher Management in Florida Ann B. Hodgson, Ph. D., PWS Gulf Coast Ecosystem Science Coordinator / Sanctuaries Manager Florida Coastal Islands Sanctuaries Program 410 Ware Blvd., Ste. 702 Tampa, FL 33619 813 623-6826 Phone / 813 376-8663 Field Phone ahodgson@audubon.org

3. AMOY Conservation Issuesin Tampa Bay, FL Large AMOY breeding population and high CBC counts annually. Shoreline development continues to decrease habitat options for all life history requirements. Human disturbance from water-based recreation, residential, commercial and industrial development is stressing the AMOY population. Amplified ship wakes, primarily from the cruise ships and large cargo traffic (Tampa Bay now allows ‘Panamax’ ships), create impressive bow wakes that are over-washing AMOY nests, particularly with the high spring tides.

4. American Oystercatcher Count by 2003 CBC Circle

5. CBC FL - number of birds reported per party hour

6. Data: Number of birds reported per party hour The graph was generated using the number of birds reported per party hour; a measure of the amount of time spent searching for birds or the amount of effort expended. This is one way to standardize Christmas Bird Count data over time. Some years, there may have been a lot of people counting birds, while other years there may have been fewer participants in the field. As CBC participation fluctuates (and as the number of CBC Count Circles increases), raw count numbers may also fluctuate (more counters can often lead to more birds reported).

7. CBC FL - raw count numbers

8. Data: Raw count numbers The graph was generated using raw count numbers for the species selected. Because of fluctuations in the number of participants on CBC's from year to year, and the growth in the number of CBC count circles over the last 100 years, the graph may be misleading.

9. 2006 Pairs of AMOY, SNPL, and WIPL on the FL Gulf Coast

10. 2007 Pairs of AMOY on the FL Gulf Coast

11. 2007 Pairs of AMOY on the FL Gulf Coast

12. AMOY breeding census 1994-2006, Tampa Bay, FL

13. 2007 Pairs of AMOY – Lake Worth Lagoon S. Lake Worth Lagoon – Snook Islands 1 large feathered young hatched on an isolated mangrove island in the south lagoon (local manager photographed the chick). RECAP 2007 Gulf Coast - all sites – 112 prs; adjusted for unsurveyed and/or new surveys = 122+ Tampa Bay - 88 prs Habitat loss – submerging islands & disturbance

14. Factors affecting AMOY Reproductive Success in Hillsborough Bay, FL 2006 population estimate was 68 pairs/nests in Hills. Bay, FL. Nesting concentrated on Spoil islands 2D&3D, and RTP Alafia Bank Bird Sanctuary, and Apollo Beach area. 68/(850 birds/2) = 68/425 = 15+% of the Florida population. Strong site fidelity – the same pairs nest at the same site every year; comparing nest sites inter-annually, we know that pairs come in early on the same beach sites annually; the trio always nests at the same site for the past 15 yrs. High fecundity / pair. Low chick survivorship. Poor fledging success.

15. Tampa Bay, FL

16. Hillsborough Bay, FL

17. Apollo Beach, S. Hillsborough Bay, FL

18. Richard T. Paul Alafia Bank Bird Sanctuary, 3Dand ‘Beer Can Island’

19. Tampa Bay AMOY Nest Sites

20. Port Manatee Key, S. Tampa Bay, FL.

21. AMOY/beach-nesting shorebird protection is labor-intensive!

22. Adult AMOY are regularly disturbed by recreational boaters

23. Amoy nests are practically invisible

24. AMOY chicks are vulnerable to predation regardless of cryptic coloration

25. Typical oyster bar and mangrove islets habitat

26. Emergent oyster bars provide shorebird foraging

27. Hillsborough Bay AMOY Conservation Planning FCISP participates on the Tampa Bay regional Migratory Bird Protection Committee with agency partners (U. S. Army Corps of Engineers, Florida Fish and Wildlife Conservation Commission, Tampa Port Authority (TPA)). FCISP annual conducts AMOY breeding surveys on the Gulf Coast. The TPA is increasing the dike height 20 ft. on Spoil Island 2D. TPA proposed to construct a ‘wildlife habitat structure’ as part of the project mitigation - FCISP recommended the site location of the ‘structure’ in front of 7 persistent AMOY territories. The ‘structure’ will be a revetment of large rip rap, designed to attenuate high waves from large cargo ships in the shipping channel. FCISP staff seasonally patrols AMOY breeding locations/known nesting areas, especially in Hillsborough Bay, on weekends and holidays – we have distributed 70,000 Hillsborough Bay Boaters’ Guides in the past 5 years to provide public boating education and marine conservation. FCISP is leading the beach-nesting bird conservation committee to protect AMOY and other beach-nesters along the Gulf Coast region. FCISP received a TPA grant to analyze 15+ years of AMOY data in Hillsborough Bay. FCISP submitted a WCS grant to expand Project ColonyWatch and beach-nesting bird protection on the Gulf Coast region.

28. Spoil Island 2D – the Tampa shipping channel is off the west shore.

29. 2D ‘Wildlife Habitat Structure’ Locations

30. Acknowledgments U. S. Fish and Wildlife Service Coastal Program NFWF Pinellas County Environmental Fund Tampa Port Authority Manatee County Port Authority Environmental Protection Commission of Hillsborough County Tampa Bay Estuary Program Sarasota Bay Estuary Program Sarasota County Environmental Department Mosaic LLC Gulfstream LLC Private Donors Literature Cited Hodgson, A. B., A. F. Paul, and M. Rachal. 2007. Bay Environmental Monitoring Report: Chapter 17 – Avian Conservation. Tampa Bay Estuary Program, St. Petersburg, FL. National Audubon Society. 2006. Internet:http://audubon2.org/birds/cbc. Accessed 2Dec2006.

31. Questions?