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Shellfish Mariculture in Drakes Estero, Point Reyes National Seashore, California (2009)

Chapter: Appendix D: Tabulated Summary of Reported Values of Harbor Seal Flushing Distances

« Previous: Appendix C: Agenda: Meeting of the Committee on Best Practices for Shellfish Mariculture and the Effects of Commercial Activities in Drakes Estero, Pt. Reyes National Seashore, California
Suggested Citation:"Appendix D: Tabulated Summary of Reported Values of Harbor Seal Flushing Distances." National Research Council. 2009. Shellfish Mariculture in Drakes Estero, Point Reyes National Seashore, California. Washington, DC: The National Academies Press. doi: 10.17226/12667.
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Page 118

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Appendix D Tabulated Summary of Reported Values of Harbor Seal Flushing Distances Disturbance Mean Range Source (m) SD (m) Habitat Type Reference Powerboat No Data No Data <100–300 Small Estuary Allen et al., 1984 Powerboat 144 No Data 28-260 Island Suryan and Harvey, Archipelago 1999 Powerboat 80 No Data No Data Glacial Fjord Mathews, 1996 Powerboat 105 105 No Data Glacial Fjord Lewis and Mathews, 2000 Stationary 191 125 27–371 Island Johnson and Acevedo- Powerboat Archipelago Gutierez, 2007 Motor 533 No Data 100–1150 Large Estuary Brasseur and yacht Reijnders, 1994a Rubber 350 No Data 70–650 Large Estuary Brasseur and Dinghy Reijnders, 1994a Cruise Ship 200 No Data <100–850 Glacial Fjord Nansen et al., 2006a Cruise Ship 123 No Data No Data Glacial Fjord Mathews, 1996 People No Data No Data <100–200 Small Estuary Allen et al 1984 People 200 No Data 10–400 Large Estuary Brasseur and Reijnders, 1994a People 142 135 No Data Glacial Fjord Lewis and Mathews, 2000 avalues estimated from figures 118

Next: Appendix E: Shellfish High Health Program Guideline: A Voluntary Program for Producers of Live Shellfish »
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When Drakes Estero, which lies within the Point Reyes National Seashore (PRNS) about 25 miles northwest of San Francisco, California, was designated by Congress in 1976 as Potential Wilderness, it contained a commercial shellfish mariculture operation. Oyster mariculture began in Drakes Estero with the introduction of the nonnative Pacific oyster in 1932, and has been conducted continuously from that date forward. Hence, the cultural history of oyster farming predates the designation of Point Reyes as a National Seashore in 1962.

Nevertheless, with the approach of the 2012 expiration date of the current National Park Service (NPS) Reservation of Use and Occupancy (RUO) and Special Use Permit (SUP) that allows Drakes Bay Oyster Company (DBOC) to operate within the estero, NPS has expressed concern over the scope and intensity of impacts of the shellfish culture operations on the estero's ecosystem. Public debate over whether scientific information justifies closing the oyster farm led to the request for this study to help clarify the scientific issues raised with regard to the shellfish mariculture activities in Drakes Estero.

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