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Sanpisa Sritrairat Master Thesis, March 21, 2006

Human Impacts and Climate Variability at Tivoli North Bay, Hudson River, New York. Sanpisa Sritrairat Master Thesis, March 21, 2006 Lamont-Doherty Earth Observatory of Columbia University. Overview. Hudson River Reserve Sites. Troy. Tivoli Bays Pollen and Spores Analysis

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Sanpisa Sritrairat Master Thesis, March 21, 2006

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  1. Human Impacts and Climate Variability at Tivoli North Bay, Hudson River, New York Sanpisa Sritrairat Master Thesis, March 21, 2006 Lamont-Doherty Earth Observatory of Columbia University

  2. Overview Hudson River Reserve Sites Troy • Tivoli Bays • Pollen and Spores Analysis • Sedimental Analysis Stockport Flat Tivoli Bays Iona Island Piermont Marsh

  3. Current Research Myriophyllum spicatum Trapa natans Lythrum salicaria Typha angustifolia Phragmites australis

  4. Study Location

  5. Methods • Coring (2cm resolution) • Sediment Digestion • 7-120 μm Lycopodium spp. spike

  6. Pollen and Spores Analysis Quercus spp. Betula spp. Pinus spp. Sediment sample, the Geological Society of Canada

  7. Carbon and Nitrogen Content • 2-2.5 μg of dry samples (CHNS/O analyzer , 2400 Series II, Perkin-Elmer) • 925 ºC Combustion, 640 ºC Reduction • Low C/H • Reproducible

  8. Lithology, C and N content 0- 10- 20- 30- 40- 50- 60- 70- 80- 90- 100- T-4 light gray silty clay Depth (cm) T-3 Dark gray silty clay European Settlement ~1700 A.D. T-2 Black gray fine muck T-1 Black Peat Muck Percent Ambrosia, charcoal count, and C,N,H, and C/N content of the sediment

  9. Forest Composition 0- 10- 20- 30- 40- 50- 60- 70- 80- 90- 100- Depth (cm) 1700 AD

  10. Wetland Composition 0- 10- 20- 30- 40- 50- 60- 70- 80- 90- 100- Depth (cm) 1700 AD Selected Percent Pollen and Spores of wetland plants

  11. Invasive Species Percent Pollen and Spores at Tivoli North Bay 0- 10- 20- 30- 40- 50- 60- 70- 80- 90- 100- Typha angustifolia Depth (cm) Lythrum salicaria

  12. Climate Variability 0- 10- 20- 30- 40- 50- 60- 70- 80- 90- 100- Little Ice Age 1400-1800 A.D. Depth (cm) Warming

  13. Conclusion and Future Research • Wetlands and forest composition changed after the European Settlement • % organic matter declined • Climate Change • Chronology • Regional vs. Local signal • Species identification

  14. Acknowledgements Sea Grant and HRERR Dorothy Peteet, Dee Pederson, Cecelia Baum, Chuck Neider, Geof Eckerlin, Jamie Miller,John Lipscomb, Miriam Jones, Kevin Griffin, Chengyuan Xu, Peter deMenocal, Tim Kenna, Steve Chillrud, Jim Simpson

  15. Carbon and Nitrogen Content • 2-2.5 μg of dry sample (CHNS/O analyzer , 2400 Series II, Perkin-Elmer) 640 ºC Reduction 925 ºC Combustion Chromatographic column Thermal conductivity

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