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Measuring and evaluating nitrogen removal services in oyster reefs - - PowerPoint PPT Presentation
Measuring and evaluating nitrogen removal services in oyster reefs - - PowerPoint PPT Presentation
Measuring and evaluating nitrogen removal services in oyster reefs M F Piehler, A R Smyth, J H Grabowski and SP Thompson Consequences of oyster habitat degradation Filtration Stabilization Habitat Loss of ecosystem goods and services
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Habitat degradation tends to reduce habitat complexity
Complex Habitats Simple Habitats
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Grabowski et al. (2012) Bioscience
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Oyster reefs may help resist eutrophication
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Illustration by AR Joyner and HW Paerl
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Piehler and Smyth 2011, Ecosphere
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“Indeed, a man would have to eat sixteen dozen of these acephalous molluscs in order to gain the 315 grammes of nitrogen he requires daily.” Jules Verne, 'Twenty Thousand Leagues Under the Sea’
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Oyster Reef Denitrification and Landscape Position
How does landscape setting affect oyster reef denitrification?
Oyster reefs Control Seagrass + Marsh Seagrass + Marsh+ Reef Marsh Marsh + Reef Mudflat + Reef Mudflat
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50 100 150 200 250 Mudflat Marsh SAV + Marsh Denitrification (μmol N-N2 m-2 hr-1) Habitat Setting Control + Reef
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Oyster Reef Landscape Position And Denitrification
Seagrass + Marsh
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Oyster Reef Landscape Position And Denitrification
100 200 300 400 500 600 Mudflat Marsh SAV + Marsh Denitrification (μmol N-N2 m-2 hr-1) Habitat Setting
Control Control + Nitrate + Reef + Reef + Nitrate
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Seagrass + Marsh
Response to increased nutrient loading
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50 100 150 200 250 300 350 Control Shell Live Denitrification (μmol N-N2 m-2 hr-1) Treatment
Results from sediment flux experiment
Biotic and Abiotic Denitrification
No difference in rates between weeks Average Percent Increase Shell: 24% Live: 61%
N=8, Wilcoxon
Rates similar to
- ther oyster reefs
and mud flats in area during summer.
A B C
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$1600 $1300 $200 $1600 $800
Evaluating estuarine N processing
- Rigorous measurements of processes
- Net contributions to N processing
- Transferable data
All values are dollars per hectare per year
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What does estuarine N removal cost?
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Where to next?
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Invaluable contributions…
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Many thanks…
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