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Macrophytes and Eutrophication in Oyster Pond

Macrophytes and Eutrophication in Oyster Pond. Jennifer Culbertson Erin Kinney. Different contributions of wastewater in each sub-watersheds as seen from groundwater data Land use  source of N into pond  δ 15 N signature of macrophytes Why Macrophytes? Long lived Abundant Widespread

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Macrophytes and Eutrophication in Oyster Pond

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  1. Macrophytes and Eutrophication in Oyster Pond Jennifer Culbertson Erin Kinney

  2. Different contributions of wastewater in each sub-watersheds as seen from groundwater data Land use  source of N into pond  δ15N signature of macrophytes Why Macrophytes? Long lived Abundant Widespread Store N in tissues Background

  3. Survey Questions • What are the inter-annual changes in the dominant species present? • What is the dominant source of nitrogen for macrophytes? • Wastewater • Atmosphere • Fertilizer run-off

  4. Macrophyte Sampling Sites Sixteen Sites N=40 6 macrophytes 4 algae 2 1 3 15 4 14 13 5 12 6 11 7 10 9 8 16

  5. Potamogeton spp. Myriophyllum tenellum Najas flexilis (Pondweed) (Bushy Pondweed) Zannichellia palustris (Horned Pondweed) Ceratophyllumdemersum Chara vulgaris (Coontail) (Stonewort) Schneider and Melzer 2003

  6. Ceratophyllum demersum - Coontail • Tracy et al. 2003 have found coontail is common in nutrient enriched lakes in Michigan • Coontail is floating – foliar uptake of nutrients from water column

  7. Isotope Signature • This is important for examining δ15N signatures of macrophytes to determine nitrogen source – particularly wastewater (Valiela et al. 2000)

  8. Isotope Signature • Dried and packaged for isotope analysis: UC Davis Stable Isotope Facility • Continuous Flow Isotope Ratio Mass Spectrometer

  9. δ 15Nfor Each Genus in Oyster Pond in 2001, 2002 and 2004 Combined Genera δ15N

  10. Mean (± s.e.) Macrophyte Nitrogen Signaturein 2001, 2002 and 2004 at Each Measured N load δ15N

  11. Isotope Signatures for Rooted and Non-rooted Macrophytes in Oyster Pond for years 2001, 2002 and 2004 δ15N ▲ Rooted - - - ■ Non-rooted —

  12. Oyster Pond

  13. Conclusions • Macrophyte genera may indicate eutrophication of Oyster Pond • δ15N values of macrophytes are more sensitive of nutrient source at low N load • Floating macrophytes are a better indicator of incipient N load

  14. Thank you! Residents of Oyster Pond Mr. Weeks Mr. and Mrs. Sears Ivan Valiela and Jennifer Bowen Leanna Heffner

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