Spatial and temporal patterns of river metabolism along the Cahaba River, AL
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Transcript of Spatial and temporal patterns of river metabolism along the Cahaba River, AL
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Spatial and temporal patterns of river metabolism along the Cahaba River, AL
Elise Chapman, Ryan Sponseller & Jennifer Edmonds
The University of AlabamaDepartment of Biological Sciences
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Continuing pressure on water resources• Growing urbanization and agricultural demands on
our landscape occur due to population growth.• These demands often result in physical and chemical
changes to waterways.• Eutrophication• Loss of species diversity• Harmful Algal Blooms
Randy Haddock, Cahaba River Society
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Stream mitigation of nutrient loading
Small Streams• Lower ratio of water volume to
sediment area (Alexander et al. 2000)
• Account for majority of stream length (Leopold et al. 1964)
Rivers• Longer transport distance and
water residence time (Wollhiem et al. 2006, Mulhollnad et al. 2008)
• Elevated nutrient concentrations
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O2
Reaeration (k)
Ecosystem Respiration (ER)
Gross Primary Production (GPP)
Ecosystem metabolism
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Estimating metabolic parametersBayesian Metabolism Model
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Gulf Coastal Plain
Valley & Ridge
Fall Line
Mobile River Basin Valley & Ridge
Gulf Coastal
Plain
Fall Line
Modified from USGS map
Mobile River Basin Valley & Ridge
Gulf Coastal
Plain
Fall Line
Modified from USGS map
The Cahaba River
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Research ObjectiveIdentify spatial and temporal patterns of ecosystem metabolism in a mid-sized river.
Hypothesis: GPP & ER will be highest along the Fall Line due to highly heterogeneous channel form.
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Spatial patterns of GPP & ER
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Spring
GPPER
g O
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Fall
GPPER
g O
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VR FL CP
VR FL CP
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GPPER
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Winter
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Spatial patterns of GPP:ER
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GPP
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GPP
: ER
VR FL CP
VR FL CPVR FL CP
VR FL CP
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ConclusionsBoth GPP and ER were higher in spring and summer compared to
fall and winter.In most cases ER exceeded GPP indicating net heterotrophy.
Hypothesis: GPP and ER will be highest along the Fall Line due to highly heterogeneous channel form.
No and Yes
1 2 30
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Summer
GPPER
g O
2 m
-2 d
ay-1
VR FL CP1 2 3
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Winter
GPPER
g O
2 m
-2 d
ay-1
VR FL CP
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Field Help
Acknowledgments
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Questions?
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Comparison to other rivers
Townsend et al. 2011
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Example ecosystem metabolism parameter estimates from BaMM
Gross primary production (GPP, g O2 m-2 day-1), respiration (R, g O2 m-2 day-1), P/R, and gasexchange (k, day-1) estimated by BaMM in winter along the Cahaba River , AL.