Cutler Reservoir Dingle Marsh

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Cutler Reservoir Dingle Marsh
Wetlands
The Cutler Reservoir and Dingle Marsh Ecosystems
AWER 4510
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Ecosystem Primary Production.xls
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Nitrate removal by artificial wetland
Water retention time (Days)
Source Lewis, W.M. Jr. 2001. Wetlands
Explained. Oxford
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Comparison of Aquatic Systems
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www.ittiofauna.org/webmuseum/
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Wetland Food Web
Phytoplankton?
Dodds (2002)
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Ecological determinism on the Orinoco floodplain.
2000. W.M. Lewis et al. BioScience 50
681-692
Orinoco (Venezuela) Despite massive amounts of
carbon in grass mats, stable isotope analyses
indicated that most invertebrates and fish
derived their carbon from either attached algae
or phytoplankton
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Cutler -No submerged macrophytes
Dingle (Mud Lake) thick submerged
macrophytesPeriphyton ? Role of Macrophytes?
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Cutler Reservoir Dingle Marsh
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Draft Cutler Reservoir TMDL Report

• The State of Utah has designated the Beneficial
  Uses of
• Cutler Reservoir to be
• secondary contact recreation (2B),
• warm water game fish and associated food chain
  (3B)
• water fowl, shore birds and associated food
  chains (3D)
• and agricultural water supply (4).
• The warm water game fish
• designated use (3B) was identified as partially
  impaired on the State of Utah 2006 303(d) list
• Secondary contact recreation and agricultural
  water supply designated uses were listed as being
  fully supported on this same list.

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What limits phytoplankton and periphyton growth
in Cutler?

• Nutrients?
• Light?
• Top-down control (grazing)

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Nutrient Limitation?
N P Ratio
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Light Limitation?Photic zone is how many
Secchi depths?Mean depth of Cutler is?
/Secchi 0.25 - 0.4 m
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Turbidity is high!
http//img93.imageshack.us/
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Site 7
Cutler Reservoir Point Non-Point Nutrient
Loading is high
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Secchi Turbidity Dissolved solids
pH Salinity Conductivity
Site 7
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Nutrient Levels are Very high Problem?
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Zooplankton Densities are high (but small
plankton)
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Lots of fish Particularly carp
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Stable Isotope Analyses
Trophic Position
Food Source