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Levinton jb task force 4 17-2018

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Professor Levinton discusses oysters and water quality in Jamaica Bay

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Levinton jb task force 4 17-2018

  1. 1. Nitrogen input and historical variation of water quality Jeffrey Levinton Ecology and Evolution Dept. Stony Brook University jeffrey.levinton@stonybrook.edu
  2. 2. Three sections 1 Seasonal variation of food supply and access of restored oysters to Jamaica Bay primary production by season 2 Historical changes in water quality since 1990 as compared to nitrogen input 3 Fine time-scale spatial correlation of water quality at sites across Jamaica Bay, summer 2015
  3. 3. Access of restored oysters to Jamaica Bay primary production
  4. 4. Water is vertically mixed – little or no stratification 1 m depth 5 m depth 9/2017
  5. 5. STN JBC
  6. 6. Oyster Clearance Rate Conclude: oysters don’t have access to the winter-spring bloom
  7. 7. Part 2 • Historical changes in water quality since 1990 as compared to nitrogen input
  8. 8. Nitrogen input and historical variation of water quality Jeffrey Levinton Ecology and Evolution Dept. Stony Brook University FromNixon 1992 Peconic Bay Great South Bay Jamaica Bay Peconic Bay, Bruno, 1983 GSB, Schubel et al. 1991 JB, Wallace, 2012
  9. 9. History of N Input – Jamaica Bay Courtesy John McLoughlan
  10. 10. Analysis of stations sampled since 1990 N9A J1A J5
  11. 11. East – West Water Quality Gradient
  12. 12. From Benotti et al. 2009 after data from Hydroqual
  13. 13. Analysis of stations sampled since 1990 N9A J1A J5
  14. 14. N9A J1A J5 N9A J1A J5
  15. 15. N9A J1A J5 N9A J1A J5
  16. 16. N9A J5 J1A N9A J1A J5
  17. 17. Analysis of Covariance – Time Significant, Interaction of Time x Location NS
  18. 18. Fine scale spatial correlation of water quality at sites across Jamaica Bay, summer 2015
  19. 19. Summer 2015
  20. 20. Four sensors, summer 2015 Thanks to Jim Browne for Inwood, Chris Gobler for JFK, Riis Landing, NYC for Broad Channel
  21. 21. END THANK YOU! QUESTIONS? Thanks: Support from Hudson River Foundation, U.S. National Parks Service, DO Fund
  22. 22. Oysters have no feeding access to winter-spring bloom

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