Download - Peipoch, M. , F.R. Hauer, and H.M. Valett University of Montana Division of Biological Sciences
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Peipoch, M., F.R. Hauer, and H.M. Valett
University of MontanaDivision of Biological Sciences
Montana Institute on Ecosystems
BIOGEOCHEMICAL VARIATION AMONG AQUATIC HABITATS OF
RIVERINE FLOODPLAINS
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Habitat Heterogeneity vs. Niche Diversity
HABITAT HETEROGENEITY
NICHE DIVERSITYBIODIVERSITY
ECOSYSTEMFUNCTION
Physical Heterogeneity Increases Biofilm Resource Useand Its Molecular Diversity in Stream MesocosmsSinger et al. 2012
Flow heterogeneity
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Ecology’s most general, yet protean pattern: the species-area relationship
Lomolino 2000
Habitat area
Sp
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Ric
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Biodiversity improves water quality through niche partitioning
Cardinale 2011
Species richness
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BIOCOMPLEXITY“Michener et al. 2001, Thompson et al. 2001”
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Floodplain Complexity
Floodplain complexity: ‘a measure of the variation in geomorphic, hydrologic, and biological forms and processes that exist among ecologically distinct habitats of floodplain landscapes’
Stanford et al. 2005
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Multi-scale Assessment of Riverscape Complexity (MARC) Project
1. Variation in nutrient concentrations among floodplain aquatic habitats
2. Variation in biomass abundance among floodplain aquatic habitats
3. Quantification of ecosystem metabolism for four critical habitats in riverine floodplains
10 river floodplains across Montana
Bitterroot
Clark Fork
Boulder
Madison
MilkMissouri
TongueBig horn
Big hole
Swan
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Runs
Floodplain aquatic habitats
Parafluvial springbrooks
Backwaters
Orthofluvial springbrooks
Ponds
Flow channels
Pools
Shore lineRun
s
Riffles
Confluence zones
• Main channel habitats (n=5 per floodplain, n=3 per habitat)
• Off-channel habitats (n=5 per floodplain, n=3 per habitat)
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Biogeochemical variation among floodplain habitats
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SURFACE WATERS HYPORHEIC WATERS
Biogeochemical variation: Ammonium
NH4 concentration vs. O2 concentration; r = -0.6 , p-value < 0.01
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SURFACE WATER HYPORHEIC WATER
Biogeochemical variation: Nitrate
Low NO3- concentration in surface waters despite of high
NO3- concentration in the hyporheic zone
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SURFACE WATER HYPORHEIC WATER
Biogeochemical variation: Soluble reactive phosphorus (SRP)
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N:P ratios vs. Chlorophyll
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Biogeochemical variation in floodplain habitats
Off-channel habitats play a critical role on the niche diversity of river floodplains by generating larger biogeochemical variation
Ammonium NitrateDissolved Oxygen
Biomass abundance Chl-a abundance
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Ecosystem metabolism among floodplain habitats
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Gross Primary Production & Ecosystem Respiration
MCn=4
PSn=2
OSn=3
PNn=4
MCn=4
PSn=2
OSn=3
PNn=4
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GPP:ER ratios
MCn=4
All river floodplains
PSn=2
OSn=3
PNn=4
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• Off-channel habitats are responsible for the majority of biogeochemical variation observed in river floodplains.
• Variation in N:P ratios (i.e., Nitrate) determines Chl-a standing stocks among aquatic habitats of river floodplains.
• Main-channel habitats are mostly autotrophic environments while off-channel habitats, especially orthofluvial ponds, are principally heterotrophic ecosystems (i.e., ER > GPP).
• GPP:ER ratios in main-channel and off-channel zones seem to be driven by SRP and NO3 concentrations, respectively.
General Conclusions
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