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: (EM-668)
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EM-668: Nutrient cycling by fish supports relatively more primary production as lake productivity increases
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EM Identity and Description
| EM-668 | |
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Document Author
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Vanni, M.J., Bowling, A.M., Dickman, E.M., Hale, R.S., Higgins, K.A., Horgan, M.J., Knoll, L.B., Renwick, W.H., and R.A. Stein |
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Document Year
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2006 |
Variable General Info
| Lake trophic status | Lake-wide N excretion rate (gizzard shad population) | Lake-wide P excretion rate (gizzard shad population) | Nutrient demand (P) (phytoplankton) | Nutrient demand (phytoplankton) | Proportion of primary productivity supported by gizzard shad | Proportion of watershed land use in agriculture | |
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Variable ID
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15971 | 15968 | 15969 | 15973 | 15972 | 15974 | 15970 |
| Not reported | Not reported | Not reported | Not reported | Not reported | Not reported | Not reported | |
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Qualitative-Quantitative
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Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) |
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Cardinal-Ordinal
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Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal |
Not applicable ?Comment:varies by indicator of trophic status. |
mg N/m^2/day | mg P/m^2/day | mg P/m^2/day | mg N or P/m^2/day | unitless (0-1) | % |
Variable Typology
| Lake trophic status | Lake-wide N excretion rate (gizzard shad population) | Lake-wide P excretion rate (gizzard shad population) | Nutrient demand (P) (phytoplankton) | Nutrient demand (phytoplankton) | Proportion of primary productivity supported by gizzard shad | Proportion of watershed land use in agriculture | |
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Predictor-Intermediate-Response
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Response |
Response |
Response |
Response |
Response |
Response |
Response |
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Predictor Variable Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Response Variable Type
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Computed Variable |
Computed Variable |
Computed Variable |
Computed Variable |
Computed Variable |
Computed Variable |
Computed Variable |
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Data Source/Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Variable Classification Hierarchy
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5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
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--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components |
--Biological characteristics, processes or requirements of living ecosystem components |
--Biological characteristics, processes or requirements of living ecosystem components |
--Biological characteristics, processes or requirements of living ecosystem components |
--Biological characteristics, processes or requirements of living ecosystem components |
--Biological characteristics, processes or requirements of living ecosystem components |
--Land use/land cover type or dominant habitat type |
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----Other, multiple, unspecified or unclear |
----Biological characteristics, processes or requirements of fauna |
----Biological characteristics, processes or requirements of fauna |
----Biological characteristics, processes or requirements of flora and fungi |
----Biological characteristics, processes or requirements of flora and fungi |
----Biological characteristics, processes or requirements of fauna |
----Agroecosystems |
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------Fish |
------Fish |
------Phytoplankton |
------Phytoplankton |
------Fish |
------Other, multiple, unspecified or unclear |
Variable Spatial Characteristics
| Lake trophic status | Lake-wide N excretion rate (gizzard shad population) | Lake-wide P excretion rate (gizzard shad population) | Nutrient demand (P) (phytoplankton) | Nutrient demand (phytoplankton) | Proportion of primary productivity supported by gizzard shad | Proportion of watershed land use in agriculture | |
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Spatial Extent Area
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100,000-1,000,000 km^2 | 100,000-1,000,000 km^2 | 100,000-1,000,000 km^2 | 100,000-1,000,000 km^2 | 100,000-1,000,000 km^2 | 100,000-1,000,000 km^2 | 100,000-1,000,000 km^2 |
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Spatially Distributed?
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Yes | Yes | Yes | Yes | Yes | Yes | Yes |
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Observations Spatially Patterned?
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Yes | Yes | Yes | Yes | Yes | Yes | Yes |
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Spatial Grain Type
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Other (specify), for irregular (e.g., stream reach, lake basin) | Other (specify), for irregular (e.g., stream reach, lake basin) | Other (specify), for irregular (e.g., stream reach, lake basin) | Map scale, for cartographic feature | Other (specify), for irregular (e.g., stream reach, lake basin) | Other (specify), for irregular (e.g., stream reach, lake basin) | Other (specify), for irregular (e.g., stream reach, lake basin) |
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Spatial Grain Size
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lake | lake | lake | lake | lake | lake | lake watershed |
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Spatial Density
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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EnviroAtlas URL
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Variable Temporal Characteristics
| Lake trophic status | Lake-wide N excretion rate (gizzard shad population) | Lake-wide P excretion rate (gizzard shad population) | Nutrient demand (P) (phytoplankton) | Nutrient demand (phytoplankton) | Proportion of primary productivity supported by gizzard shad | Proportion of watershed land use in agriculture | |
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Temporal Extent
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2000-2003 | 2000-2003 | 2000-2003 | 2000-2003 | 2000-2003 | 2000-2003 | 2000-2003 |
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Temporally Distributed?
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No | Yes | Yes | Yes | Yes | Yes | No |
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Regular Temporal Grain?
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Not applicable | Yes | Yes | Yes | Yes | Yes | Not applicable |
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Temporal Grain Size Value
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Not applicable | 1 | 1 | 1 | 1 | 1 | Not applicable |
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Temporal Grain Size Units
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Not applicable | year | Not applicable | year | year | year | Not applicable |
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Temporal Density
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Values
| Lake trophic status | Lake-wide N excretion rate (gizzard shad population) | Lake-wide P excretion rate (gizzard shad population) | Nutrient demand (P) (phytoplankton) | Nutrient demand (phytoplankton) | Proportion of primary productivity supported by gizzard shad | Proportion of watershed land use in agriculture | |
| Not applicable | varies by run | varies by run | varies by run | varies by run | varies by run | Not applicable | |
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Min Value
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Not applicable | varies by run | varies by run | varies by run | varies by run | varies by run | Not applicable |
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Max Value
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Not applicable | varies by run | varies by run | varies by run | varies by run | varies by run | Not applicable |
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Other Value Type
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Single Observation or Parameter Value | Single Observation or Parameter Value | Single Observation or Parameter Value | Single Observation or Parameter Value | Single Observation or Parameter Value | Single Observation or Parameter Value | Single Observation or Parameter Value |
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Other Value
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Varies by run | varies by run | varies by run | varies by run | varies by run | varies by run | varies by run |
Variable Variability and Sensitivity
| Lake trophic status | Lake-wide N excretion rate (gizzard shad population) | Lake-wide P excretion rate (gizzard shad population) | Nutrient demand (P) (phytoplankton) | Nutrient demand (phytoplankton) | Proportion of primary productivity supported by gizzard shad | Proportion of watershed land use in agriculture | |
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Variability Expression Given?
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Not applicable | No | No | No | No | No | Not applicable |
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Variability Metric
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None | None | None | None | None | None | None |
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Variability Value
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None | None | None | None | None | None | None |
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Variability Units
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None | None | None | None | None | None | None |
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Resampling Used?
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Variability Expression Used in Modeling?
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Operational Validation (Response Variables only)
| Lake trophic status | Lake-wide N excretion rate (gizzard shad population) | Lake-wide P excretion rate (gizzard shad population) | Nutrient demand (P) (phytoplankton) | Nutrient demand (phytoplankton) | Proportion of primary productivity supported by gizzard shad | Proportion of watershed land use in agriculture | |
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Variable ID
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15971 | 15968 | 15969 | 15973 | 15972 | 15974 | 15970 |
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Validated?
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Validation Approach (within, between, etc.)
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None | None | None | None | None | None | None |
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Validation Quality (Qual/Quant)
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None | None | None | None | None | None | None |
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Validation Method (Stat/Deviance)
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None | None | None | None | None | None | None |
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Validation Metric
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None | None | None | None | None | None | None |
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Validation Value
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None | None | None | None | None | None | None |
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Validation Units
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None | None | None | None | None | None | None |
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Use of Measured Response Data
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None | None | None | None | None | None | None |