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: (EM-661)
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EM-661: Nutrient loading by anadromous alewife (Alosa pseudoharengus): contemporary patterns and predictions for restoration efforts
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EM Identity and Description
| EM-661 | |
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Document Author
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West, D. C., A. W. Walters, S. Gephard, and D. M. Post |
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Document Year
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2010 |
Variable General Info
Phosphorus exported from lake by young of year alewives ?Comment:The mass of phosphorus exported from the lake by YOY alewives (PYOY) was modeled as PYOY = nYOY x massYOY x [PYOY] x area where nYOY x massYOY is a density-dependent function that relates the biomass density of YOY alewives to the number of adult spawners, [PYOY] is the concentration of phosphorus in each YOY alewife (grams phosphorus per gram wet weight), and area is the lake area in hectares. The biomass density of YOY alewives (nYOY x massYOY) emigrating from the lake was calculated on an areal basis and was modeled as a function with an exponential rise-to-maximum as the number of YOY individuals increases. The form of nYOY x massYOY was estimated from the mesocosm experiment performed in Linsley Pond in the summer of 2005. |
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Variable ID
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15715 |
| PYOY | |
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Qualitative-Quantitative
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Quantitative (Cardinal Only) |
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Cardinal-Ordinal
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Cardinal |
| Kg P yr^-1 |
Variable Typology
Phosphorus exported from lake by young of year alewives ?Comment:The mass of phosphorus exported from the lake by YOY alewives (PYOY) was modeled as PYOY = nYOY x massYOY x [PYOY] x area where nYOY x massYOY is a density-dependent function that relates the biomass density of YOY alewives to the number of adult spawners, [PYOY] is the concentration of phosphorus in each YOY alewife (grams phosphorus per gram wet weight), and area is the lake area in hectares. The biomass density of YOY alewives (nYOY x massYOY) emigrating from the lake was calculated on an areal basis and was modeled as a function with an exponential rise-to-maximum as the number of YOY individuals increases. The form of nYOY x massYOY was estimated from the mesocosm experiment performed in Linsley Pond in the summer of 2005. |
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Predictor-Intermediate-Response
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Response |
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Predictor Variable Type
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Not applicable |
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Response Variable Type
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Computed Variable |
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Data Source/Type
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Not applicable |
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Variable Classification Hierarchy
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5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
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--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components |
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----Phosphorus-related characteristics of ecosystem components |
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------Phosphorus accumulation or attenuation by terrestrial or aquatic ecosystem components |
Variable Spatial Characteristics
Phosphorus exported from lake by young of year alewives ?Comment:The mass of phosphorus exported from the lake by YOY alewives (PYOY) was modeled as PYOY = nYOY x massYOY x [PYOY] x area where nYOY x massYOY is a density-dependent function that relates the biomass density of YOY alewives to the number of adult spawners, [PYOY] is the concentration of phosphorus in each YOY alewife (grams phosphorus per gram wet weight), and area is the lake area in hectares. The biomass density of YOY alewives (nYOY x massYOY) emigrating from the lake was calculated on an areal basis and was modeled as a function with an exponential rise-to-maximum as the number of YOY individuals increases. The form of nYOY x massYOY was estimated from the mesocosm experiment performed in Linsley Pond in the summer of 2005. |
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Spatial Extent Area
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10-100 ha |
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Spatially Distributed?
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No |
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Observations Spatially Patterned?
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Not applicable |
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Spatial Grain Type
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Not applicable |
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Spatial Grain Size
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Not applicable |
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Spatial Density
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Not applicable |
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EnviroAtlas URL
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Variable Temporal Characteristics
Phosphorus exported from lake by young of year alewives ?Comment:The mass of phosphorus exported from the lake by YOY alewives (PYOY) was modeled as PYOY = nYOY x massYOY x [PYOY] x area where nYOY x massYOY is a density-dependent function that relates the biomass density of YOY alewives to the number of adult spawners, [PYOY] is the concentration of phosphorus in each YOY alewife (grams phosphorus per gram wet weight), and area is the lake area in hectares. The biomass density of YOY alewives (nYOY x massYOY) emigrating from the lake was calculated on an areal basis and was modeled as a function with an exponential rise-to-maximum as the number of YOY individuals increases. The form of nYOY x massYOY was estimated from the mesocosm experiment performed in Linsley Pond in the summer of 2005. |
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Temporal Extent
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1960"s and early 2000's |
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Temporally Distributed?
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Not applicable |
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Regular Temporal Grain?
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Not applicable |
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Temporal Grain Size Value
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Not applicable |
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Temporal Grain Size Units
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Not applicable |
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Temporal Density
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Not applicable |
Variable Values
Phosphorus exported from lake by young of year alewives ?Comment:The mass of phosphorus exported from the lake by YOY alewives (PYOY) was modeled as PYOY = nYOY x massYOY x [PYOY] x area where nYOY x massYOY is a density-dependent function that relates the biomass density of YOY alewives to the number of adult spawners, [PYOY] is the concentration of phosphorus in each YOY alewife (grams phosphorus per gram wet weight), and area is the lake area in hectares. The biomass density of YOY alewives (nYOY x massYOY) emigrating from the lake was calculated on an areal basis and was modeled as a function with an exponential rise-to-maximum as the number of YOY individuals increases. The form of nYOY x massYOY was estimated from the mesocosm experiment performed in Linsley Pond in the summer of 2005. |
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| Not reported | |
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Min Value
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Not reported |
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Max Value
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Not reported |
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Other Value Type
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Single Observation or Parameter Value |
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Other Value
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Values vary by run; view runs to see values |
Variable Variability and Sensitivity
Phosphorus exported from lake by young of year alewives ?Comment:The mass of phosphorus exported from the lake by YOY alewives (PYOY) was modeled as PYOY = nYOY x massYOY x [PYOY] x area where nYOY x massYOY is a density-dependent function that relates the biomass density of YOY alewives to the number of adult spawners, [PYOY] is the concentration of phosphorus in each YOY alewife (grams phosphorus per gram wet weight), and area is the lake area in hectares. The biomass density of YOY alewives (nYOY x massYOY) emigrating from the lake was calculated on an areal basis and was modeled as a function with an exponential rise-to-maximum as the number of YOY individuals increases. The form of nYOY x massYOY was estimated from the mesocosm experiment performed in Linsley Pond in the summer of 2005. |
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Variability Expression Given?
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No |
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Variability Metric
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None |
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Variability Value
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None |
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Variability Units
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None |
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Resampling Used?
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Not applicable |
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Variability Expression Used in Modeling?
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Not applicable |
Variable Operational Validation (Response Variables only)
| Phosphorus exported from lake by young of year alewives | |
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Variable ID
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15715 |
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Validated?
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Not applicable |
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Validation Approach (within, between, etc.)
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None |
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Validation Quality (Qual/Quant)
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None |
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Validation Method (Stat/Deviance)
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None |
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Validation Metric
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None |
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Validation Value
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None |
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Validation Units
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None |
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Use of Measured Response Data
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None |