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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

Macrophytes and Eutrophication in Oyster Pond

Jennifer Culbertson

Erin Kinney

background
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
survey questions
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
slide4

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

slide5

Potamogeton spp.

Myriophyllum tenellum

Najas flexilis

(Pondweed)

(Bushy Pondweed)

Zannichellia palustris

(Horned Pondweed)

Ceratophyllumdemersum

Chara vulgaris

(Coontail)

(Stonewort)

Schneider and Melzer 2003

ceratophyllum demersum coontail
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
isotope signature
Isotope Signature
  • This is important for examining δ15N signatures of macrophytes to determine nitrogen source – particularly wastewater

(Valiela et al. 2000)

isotope signature1
Isotope Signature
  • Dried and packaged for isotope analysis:

UC Davis Stable Isotope Facility

      • Continuous Flow Isotope Ratio Mass Spectrometer
mean s e macrophyte nitrogen signature in 2001 2002 and 2004 at each measured n load
Mean (± s.e.) Macrophyte Nitrogen Signaturein 2001, 2002 and 2004 at Each Measured N load

δ15N

slide11
Isotope Signatures for Rooted and Non-rooted Macrophytes in Oyster Pond for years 2001, 2002 and 2004

δ15N

▲ Rooted - - -

■ Non-rooted —

conclusions
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
thank you
Thank you!

Residents of Oyster Pond

Mr. Weeks

Mr. and Mrs. Sears

Ivan Valiela and Jennifer Bowen

Leanna Heffner