Nitrogen Cycling Processes Across an Oyster
Aquaculture Chronosequence
Robinson W. Fulweiler • Boston University • Departm...
40% increase
since ~1900s
~50% of the Global Population – Alive today – because of this process.
Erisman et al., Nature Geoscience, 2008
N Loading and Aquatic ecosystem response
• Increased algal productivity
• Harmful algal blooms
• Formation of nuisance alg...
Denitrification: NO3
-  N2 Removes nitrogen from the system
Atmosphere
(km)
Water
Column
(m)
Sediment
(cm)
Detrital
Organic
matter
Organic
matter
NH4
+
NH4
+
NO2
-
NO3
-
N2
N2O
N2O
N...
“…the old oysterman knew, there’s no better
place to grow oysters than in Rhode Island.”
-Photo & Quote from Michael A. Ri...
Beutel 2012
Millions of Oyster Aquaculture Pieces Sold Over the Last Sixteen Years
0
10
20
30
40
50
60
70
80
90
SOD(mmolO2-Om-2hr-1)
-1500
-1000
-500
0
500
1000
1500
2000
Aquaculture Oyster Cultch Control
...
Acknowledgements:
• RI Sea Grant
• Dave Beutel, CRMC
• Jim Arnoux, East Beach Oysters
(http://eastbeachblondes.com/)
• Suz...
Questions/Comments
Follow us on Twitter: @Fulweilerlab
Join our Facebook page: The Fulweiler Lab
Check out our website: ww...
Nitrogen Cycling Processes Across an Oyster Aquaculture Chronosequence
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Nitrogen Cycling Processes Across an Oyster Aquaculture Chronosequence

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Nitrogen Cycling Processes Across an Oyster Aquaculture Chronosequence presented at the May 19th, 2014 Shellfish Management Stakeholder meeting.

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Nitrogen Cycling Processes Across an Oyster Aquaculture Chronosequence

  1. 1. Nitrogen Cycling Processes Across an Oyster Aquaculture Chronosequence Robinson W. Fulweiler • Boston University • Department of Earth and Environment • Department of Biology
  2. 2. 40% increase since ~1900s
  3. 3. ~50% of the Global Population – Alive today – because of this process. Erisman et al., Nature Geoscience, 2008
  4. 4. N Loading and Aquatic ecosystem response • Increased algal productivity • Harmful algal blooms • Formation of nuisance algal mats • Low oxygen conditions • Fish kills - fin and shell • Loss of biodiversity • Loss of submerged aquatic vegetation Sybil Seitzinger, 2003
  5. 5. Denitrification: NO3 -  N2 Removes nitrogen from the system
  6. 6. Atmosphere (km) Water Column (m) Sediment (cm) Detrital Organic matter Organic matter NH4 + NH4 + NO2 - NO3 - N2 N2O N2O N2N2O Photosynthesis Bacterial degradation Bacterial degradation Nitrification N2 Denitrification Aerobic conditions Anaerobic conditions
  7. 7. “…the old oysterman knew, there’s no better place to grow oysters than in Rhode Island.” -Photo & Quote from Michael A. Rice, 2006
  8. 8. Beutel 2012 Millions of Oyster Aquaculture Pieces Sold Over the Last Sixteen Years
  9. 9. 0 10 20 30 40 50 60 70 80 90 SOD(mmolO2-Om-2hr-1) -1500 -1000 -500 0 500 1000 1500 2000 Aquaculture Oyster Cultch Control N2flux(umolN2-Nm-2hr-1) Net N2 Fluxes Spring Summer Fall Carey et al. 2014 ASLO Poster, Manuscript In Prep,
  10. 10. Acknowledgements: • RI Sea Grant • Dave Beutel, CRMC • Jim Arnoux, East Beach Oysters (http://eastbeachblondes.com/) • Suzy Ayvazian, EPA • Boze Hancock, TNC • Joanna Carey, MBL • Boston University Questions? Comments? What to know more? Follow us on Twitter: @Fulweilerlab Join our Facebook page: The Fulweiler Lab Check out our website: www.fulweilerlab.com
  11. 11. Questions/Comments Follow us on Twitter: @Fulweilerlab Join our Facebook page: The Fulweiler Lab Check out our website: www.fulweilerlab.com

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