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Summer water chemistry, phytoplankton and zooplankton community composition, size structure, and biomass in a shallow, hypereutrophic reservoir in southwestern Iowa, USA (2019).

General Information
Data Package:
Local Identifier:edi.1192.1
Title:Summer water chemistry, phytoplankton and zooplankton community composition, size structure, and biomass in a shallow, hypereutrophic reservoir in southwestern Iowa, USA (2019).
Alternate Identifier:DOI PLACE HOLDER
Abstract:

This data product contains data for Green Valley Lake, a hypereutrophic reservoir in southwest Iowa (USA) from the summer of 2019. We sampled and quantified zooplankton, phytoplankton, and nutrient concentrations (total N, total P, soluble reactive P, nitrate) in the lake weekly with the primary aim of assessing consumer nutrient cycling, specifically zooplankton nutrient cycling, in a hypereutrophic reservoir. Weekly plankton sampling included quantifying zooplankton and phytoplankton biomass, community composition, and size structure. Phytoplankton size was measured as the greatest axial linear distance which would be approached by a zooplankton grazer. Allometric equations from the literature were applied to the zooplankton size measurements to estimate zooplankton community excretion of N and P. We found that the estimated contribution of zooplankton excretion to the dissolved P pool was substantial in the spring. Further, we found evidence that zooplankton affected phytoplankton size distributions through selective grazing of smaller phytoplankton cells likely affecting nutrient uptake and storage by phytoplankton.

Publication Date:2022-08-12
For more information:
Visit: DOI PLACE HOLDER

Time Period
Begin:
2019-05-01
End:
2019-09-30

People and Organizations
Contact:Butts, Tyler J (UW-Madison) [  email ]
Creator:Butts, Tyler J (UW-Madison)
Creator:Moody, Eric K (Middlebury)
Creator:Wilkinson, Grace M (UW-Madison)
Creator:Barbour, Riley L (Iowa State University)
Associate:Wilkinson, Grace M (UW-Madison, Collaborator)
Associate:King, Rachel F (Iowa State University, Lab Technician)
Associate:Shingai, Quin (Iowa State University, Field and Lab Technician)
Associate:Walker, Shania (Iowa State University, Field Technician)
Associate:Rosenboom, Halle (Iowa State University, Field Technician)
Associate:Barbour, Riley L (Iowa State University, Lab Technician)

Data Entities
Data Table Name:
Green Valley water chemistry data, 2019
Description:
This data table contains the summer water column total phosphorus, soluble reactive phosphorus, total nitrogen, and nitrate concentrations for Green Valley lake, a reservoir in southwestern Iowa, USA. These data were compiled from research conducted by the Iowa State University Limnology Laboratory.
Data Table Name:
Green Valley phytoplankton size, 2019
Description:
This data table contains phytoplankton size measurements, expressed as the greatest axial linear distance or the greatest distance across an individual cell, colony, or filament (i.e., natural unit), such as would be encountered by a zooplankton grazer. Phytoplankton samples were collected across the summer of 2019 in Green Valley Lake.
Data Table Name:
Green Valley zooplankton body size as body length and body mass, 2019
Description:
This data table contains phytoplankton size measurements, expressed as the greatest axial linear distance, and zooplankton body length. Samples of zooplankton and phytoplankton were collected across the summer of 2019 in Green Valley Lake.
Data Table Name:
Green Valley water quality data, 2019
Description:
This data table contains high frequency measurements of chlorophyll-a, phycocyanin, and dissolved oxygen concentrations; dissolved oxygen saturation, water temperature, pH, specific conductivity, and total dissolved solids in the surface waters of Green Valley lake during the summer of 2019.
Data Table Name:
Green Valley phytoplankton community composition and biomass data, 2019
Description:
This data table details phytoplankton community compositon and biomass concentrations for Green Valley Lake. Phytoplankton samples were a composite sample over four depths (0.25 m, 1 m, 2 m, 3 m, and 4 m) to the top of the thermocline. The sample was then mixed in a 20 L carboy
Data Table Name:
Green Valley zooplankton community composition, biomass, and density data, 2019
Description:
This data table details zooplankton community composition, density, and biomass concentrations for Green Valley Lake. Zooplankton were sampled at the deepest point of each lake throughout the summers of 2018-2020. Organisms were identified to genus for cladocerans and rotiers, order for copepods, and class for ostracods. These data were compiled from research conducted by the Iowa State University Limnology Laboratory and the IDNR Ambient Lakes Monitoring Program. These data were compiled and QAQC-ed by Tyler Butts.
Detailed Metadata

Data Entities

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/edi/1192/1/8f972fe9b8040ffbfb35b0df9928de19
Name:Green Valley water chemistry data, 2019
Description:This data table contains the summer water column total phosphorus, soluble reactive phosphorus, total nitrogen, and nitrate concentrations for Green Valley lake, a reservoir in southwestern Iowa, USA. These data were compiled from research conducted by the Iowa State University Limnology Laboratory.
Number of Records:66
Number of Columns:11

Table Structure
Object Name:2019_gv_nutrients.csv
Size:2461 bytes
Authentication:8238788120514a2f72961f26d636d84e Calculated By MD5
Text Format:
Number of Header Lines:1
Record Delimiter:\r\n
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Table Column Descriptions
 
Column Name:year  
doy  
sampleDepth  
SRP_ugL  
flagSRP  
TP_ugL  
flagTP  
TN_mgL  
flagTN  
NOx_mgL  
flagNOx  
Definition:Sampling year (2019)Julian day of year when water samples were collectedThe water depth at which samples were collected as a grab sample (0.25) or using a Van Dorn sampler (2, 4, 6)Concentration of soluble reactive phosphorusData flag for soluble reactive phosphorusConcentration of total phosphorusData flag for total phosphorusConcentration of total nitrogenData flag for total nitrogenConcentration of nitrateData flag for nitrate
Storage Type:float  
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Max2019 
Unitnumber
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Max273 
Unitmeter
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UnitmicrogramPerLiter
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Max882.25 
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Code Definition
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Accuracy Report:                      
Accuracy Assessment:                      
Coverage:                      
Methods:                      

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/edi/1192/1/a194f640abd3e8d6918414894b6eaed8
Name:Green Valley phytoplankton size, 2019
Description:This data table contains phytoplankton size measurements, expressed as the greatest axial linear distance or the greatest distance across an individual cell, colony, or filament (i.e., natural unit), such as would be encountered by a zooplankton grazer. Phytoplankton samples were collected across the summer of 2019 in Green Valley Lake.
Number of Records:874
Number of Columns:4

Table Structure
Object Name:2019_gv_phytoplankton-gald.csv
Size:29672 bytes
Authentication:631afeaa86ddd013bd9fc9ad851e74d4 Calculated By MD5
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Record Delimiter:\r\n
Orientation:column
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Field Delimiter:,
Quote Character:"

Table Column Descriptions
 
Column Name:doy  
genus  
division  
gald  
Definition:Julian day of year of sample (2019)Phytoplankton taxonomic grouping. Phytoplankton were identified to genus or closest phylogenetic division.Phylogenetic division of the identified phytoplankton taxaPhytoplankton greatest axial linear distance (GALD) or the greatest distance across an individual cell, colony, or filament (i.e. natural unit), such as would be encountered by a zooplankton grazer
Storage Type:float  
string  
string  
float  
Measurement Type:rationominalnominalratio
Measurement Values Domain:
Unitnumber
Typenatural
Min143 
Max251 
DefinitionPhytoplankton taxonomic grouping. Phytoplankton were identified to genus or closest phylogenetic division.
DefinitionPhylogenetic division of the identified phytoplankton taxa
Unitmicrometer
Typereal
Min0.625 
Max337.5 
Missing Value Code:
CodeNA
Explnot available
    
CodeNA
Explnot available
Accuracy Report:        
Accuracy Assessment:        
Coverage:        
Methods:        

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/edi/1192/1/f47fe3c7c3ec1e58bdf965a65674c1f2
Name:Green Valley zooplankton body size as body length and body mass, 2019
Description:This data table contains phytoplankton size measurements, expressed as the greatest axial linear distance, and zooplankton body length. Samples of zooplankton and phytoplankton were collected across the summer of 2019 in Green Valley Lake.
Number of Records:1137
Number of Columns:5

Table Structure
Object Name:2019_gv_zoop_length-bodymass.csv
Size:49141 bytes
Authentication:23e6eef042b27ef11d9635751448c4b1 Calculated By MD5
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Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 
Column Name:doy  
taxon  
group  
length  
drymass  
Definition:Julian day of year of sample (2019)Zooplankton taxonomic grouping. Zooplankton were identified to genus for cladocerans and rotifers, order for copepods, and class for ostracods.Functional grouping of zooplankton taxaIndividual zooplankton body lengthIndividual zooplankton dry mass derived from length-mass regressions (McCauley, 1984; Dumont et al., 1975).
Storage Type:float  
string  
string  
float  
float  
Measurement Type:rationominalnominalratioratio
Measurement Values Domain:
Unitnumber
Typenatural
Min143 
Max273 
DefinitionZooplankton taxonomic grouping. Zooplankton were identified to genus for cladocerans and rotifers, order for copepods, and class for ostracods.
DefinitionFunctional grouping of zooplankton taxa
Unitmicrometer
Typereal
Min36.8 
Max11215 
Unitmicrogram
Typereal
Min0.000593482 
Max22.72148958 
Missing Value Code:
CodeNA
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CodeNA
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CodeNA
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Accuracy Report:          
Accuracy Assessment:          
Coverage:          
Methods:          

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/edi/1192/1/934bc72b296b584ba88908931d1ecfea
Name:Green Valley water quality data, 2019
Description:This data table contains high frequency measurements of chlorophyll-a, phycocyanin, and dissolved oxygen concentrations; dissolved oxygen saturation, water temperature, pH, specific conductivity, and total dissolved solids in the surface waters of Green Valley lake during the summer of 2019.
Number of Records:12243
Number of Columns:18

Table Structure
Object Name:2019_highfrequency_gv_EXO3.csv
Size:1203171 bytes
Authentication:9136f582238d1575ad578d67b125c7f1 Calculated By MD5
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Record Delimiter:\r\n
Orientation:column
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Field Delimiter:,
Quote Character:"

Table Column Descriptions
 
Column Name:year  
doyfrac  
doy  
timefrac  
chl_rfu  
chl  
cond  
odo_sat  
odo_satlocal  
odo  
salinity  
spcond  
pc_rfu  
pc  
tds  
ph  
ph_mv  
temp  
Definition:Sampling year (2019)Fractional day of year (to show time of year and time of day) of sensor measurements.Julian day of year of sensor measurements.Fractional Julian day of year (to show time of day) of sensor measurementsChlorophyll-a pigment concentrationChlorophyll-a pigment concentration, calculated from relative fluorescence unitsPhycocyanin pigment concentrationPhycocyanin pigment concentration, calculated from relative fluorescence unitsConductivitySpecific ConductanceDissolved oxygen percent saturationDissolved oxygen saturation corrected for local pressureDissolved oxygen concentrationSalinityTotal dissolved solids concentrationpHpH electrical signalWater temperature
Storage Type:float  
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float  
float  
Measurement Type:ratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratio
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Min2019 
Max2019 
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Min134.5 
Max273.42 
Unitnumber
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Max273 
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Max0.99 
UnitrawFluorescenceUnits
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Max14.37 
UnitmicrogramPerLiter
Typereal
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Max70.66 
UnitrawFluorescenceUnits
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Max481.8 
UnitmicrogramPerLiter
Typereal
Min43.1 
Max256.1 
UnitmicrosiemensPerCentimeter
Typereal
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UnitmicrosiemensPerCentimeter
Typereal
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Max21.04 
Unitpercent
Typereal
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Unitpercent
Typereal
Min0 
Max509.7 
UnitmicrogramPerLiter
Typereal
Min-1.29 
Max30.99 
UnitpracticalSalinityUnity
Typereal
Min1.27 
Max28.07 
UnitmilligramPerLiter
Typewhole
Min0 
Max331 
Unitdimensionless
Typereal
Min5.82 
Max11.24 
Unitmillivolt
Typereal
Min-318 
Max13 
Unitcelsius
Typereal
Min13.668 
Max31.082 
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CodeNA
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CodeNA
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CodeNA
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Accuracy Report:                                    
Accuracy Assessment:                                    
Coverage:                                    
Methods:                                    

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/edi/1192/1/bec6d14dc525c033b8a4a61c140569ed
Name:Green Valley phytoplankton community composition and biomass data, 2019
Description:This data table details phytoplankton community compositon and biomass concentrations for Green Valley Lake. Phytoplankton samples were a composite sample over four depths (0.25 m, 1 m, 2 m, 3 m, and 4 m) to the top of the thermocline. The sample was then mixed in a 20 L carboy
Number of Records:108
Number of Columns:7

Table Structure
Object Name:2019_site4_gv_phydata.csv
Size:7669 bytes
Authentication:c358112534d98e64111e5a1427deb750 Calculated By MD5
Text Format:
Number of Header Lines:1
Record Delimiter:\r\n
Orientation:column
Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 
Column Name:SAMPLE.ID  
LAKE.NO  
DIVISION  
TAXON  
TAXON_GROUPING  
BIOMASS.MG.L  
DOY  
Definition:Unique sample identifier for the ISU Limnology Lab databaseUnique lake identifier for the ISU Limnology Lab databasePhylogenetic division of the identified phytoplankton taxaPhytoplankton taxonomic grouping. Phytoplankton were identified to genus or closest phylogenetic division.Genera or phyla of identified phytoplankton. Column used to separate and specify certain taxa of interest (e.g., Microcystis spp. from other cyanobacteria) based on their biomass contributions versus larger phylum groupings of less abundant speciesBiomass concentration of each phytoplankton taxon found in each sample.Julian day of year when water samples were collected
Storage Type:string  
string  
string  
string  
string  
float  
float  
Measurement Type:nominalnominalnominalnominalnominalratioratio
Measurement Values Domain:
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeG19041143451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041150451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041157451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041164451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041172451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041178451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041192451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041199451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041206451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041211451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041213451.cs
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041220451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041227451
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041245451.cs
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041251451.cs
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code041
DefinitionGreen Valley Lake
Source
DefinitionPhylogenetic division of the identified phytoplankton taxa
DefinitionPhytoplankton taxonomic grouping. Phytoplankton were identified to genus or closest phylogenetic division.
DefinitionGenera or phyla of identified phytoplankton. Column used to separate and specify certain taxa of interest (e.g., Microcystis spp. from other cyanobacteria) based on their biomass contributions versus larger phylum groupings of less abundant species
UnitmilligramPerLiter
Typereal
Min7.3901e-05 
Max315.8591298 
Unitnumber
Typenatural
Min143 
Max251 
Missing Value Code:          
CodeNA
Explnot available
CodeNA
Explnot available
Accuracy Report:              
Accuracy Assessment:              
Coverage:              
Methods:              

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/edi/1192/1/890facf08cc658b9d9a4c1c0e070ac21
Name:Green Valley zooplankton community composition, biomass, and density data, 2019
Description:This data table details zooplankton community composition, density, and biomass concentrations for Green Valley Lake. Zooplankton were sampled at the deepest point of each lake throughout the summers of 2018-2020. Organisms were identified to genus for cladocerans and rotiers, order for copepods, and class for ostracods. These data were compiled from research conducted by the Iowa State University Limnology Laboratory and the IDNR Ambient Lakes Monitoring Program. These data were compiled and QAQC-ed by Tyler Butts.
Number of Records:736
Number of Columns:8

Table Structure
Object Name:2019_site4_gv_zoopdata.csv
Size:39996 bytes
Authentication:7424ec88fb4e8b21248f7f50d5bd5077 Calculated By MD5
Text Format:
Number of Header Lines:1
Record Delimiter:\r\n
Orientation:column
Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 
Column Name:SAMPLE.ID  
LAKE.NO  
DOY  
TAXON  
BIOMASS.UG.L  
INDV.L  
BIOMASS.UG  
GROUP  
Definition:Unique sample identifier for the ISU Limnology Lab databaseUnique lake identifier for the ISU Limnology Lab databaseJulian day of year when water samples were collectedZooplankton taxonomic grouping. Zooplankton were identified to genus for cladocerans and rotifers, order for copepods, and class for ostracods.Biomass concentration of each zooplankton taxon found in the sample.Density estimates of each zooplankton taxon found in each sampleDry mass estimate of each zooplankton taxon found in each sampleFunctional grouping of zooplankton taxa
Storage Type:string  
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Measurement Type:nominalnominalrationominalratioratiorationominal
Measurement Values Domain:
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeA19041211410
DefinitionAmbient Lake Program, Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041143410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041150410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041164410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041171410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041178410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041192410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041199410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041206410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041213410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041220410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041227410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041234410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041245410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041251410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Code Definition
CodeG19041273410
DefinitionGreen Valley Lake,Year, Lake ID for Green Valley Lake, Day of Year, sampled at the deep hole
Source
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code041
DefinitionGreen Valley Lake
Source
Unitnumber
Typenatural
Min143 
Max273 
DefinitionZooplankton taxonomic grouping. Zooplankton were identified to genus for cladocerans and rotifers, order for copepods, and class for ostracods.
UnitmicrogramPerLiter
Typereal
Min0 
Max165.9325825 
UnitnumberPerLiter
Typereal
Min0.044247788 
Max174.5722714 
Unitmicrogram
Typereal
Min0 
Max21.20257117 
DefinitionFunctional grouping of zooplankton taxa
Missing Value Code:    
CodeNA
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CodeNA
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CodeNA
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CodeNA
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Accuracy Report:                
Accuracy Assessment:                
Coverage:                
Methods:                

Data Package Usage Rights

This information is released under the Creative Commons license - Attribution - CC BY (https://creativecommons.org/licenses/by/4.0/). The consumer of these data ("Data User" herein) is required to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

Keywords

By Thesaurus:
(No thesaurus)Iowa Lake Restoration, Nutrient Cycling, Stoichiometry, Hypereutrophic, Body size, Excretion, Water Quality, Food Webs, Limnology, Lakes, Communities, Biogeochemistry, Ecosystem Ecology, Community Dynamics, Trophic Dynamics, Water Chemistry, Biomass, Community Composition, Size Structure, Freshwater, Nutrients, Phosphorous, Nitrogen, Zooplankton, Phytoplankton, Inorganic Nutrients

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Methods and protocols used in the collection of this data package
Description:

Water Chemistry

Field Collection: Water samples were collected at the historic deep site of the lake during the summer months (May through September) in 2019. The water chemistry data include samples collected for two different programs: a research project on internal phosphorus loading in Green Valley Lake and the and the Iowa Department of Natural Resources (IDNR) Ambient Lake Monitoring (ALM) Program. Water samples from both programs were analyzed by the ISU Limnology Laboratory directed by PI Wilkinson using the same analytic methods (see below); however, field collection methods differ slightly among programs. ALM used an integrated column sampler to sample the mixed surface layer from 0-2 m. For the research project, the ISU Limnology Lab collected water at four discrete depths: 0.25 m (epilimnetic mixed layer), 0.5 m from the sediment surface (hypolimnion), and two intermediate depths (2 m and 4 m). Epilimnetic water samples were taken by lowering the sample bottle up to elbow-depth below the surface of the water (0.25m). The bottle was filled and rinsed with lake water three times before taking the water sample. Regardless of program, all water samples were transported and stored at 4 degrees C, and sample analysis began within 24 hours of sample collection.

Soluble Reactive Phosphorus (SRP): samples were filtered (0.45µm GF/C filters) in the field, preserved with concentrated sulfuric acid to pH 2, and stored at 4 degrees C before being analyzed in duplicate using the molybdenum blue method, modified from Murphy and Riley (1962; Standard Methods 4500-P E) on a Seal Analytical AQ2 Discrete Analyzer

Total Phosphorus (TP): samples were preserved with concentrated sulfuric acid to pH 2 and stored at 4 degrees C before undergoing a persulfate digestion (Standard Methods 4500-P B.5) and being analyzed in duplicate using the molybdenum blue method, modified from Murphy and Riley (1962; Standard Methods 4500-P E) on a Seal Analytical AQ2 Discrete Analyzer

Nitrate (NOx) and Total Nitrogen (TN): Subsamples were filtered (0.45µm GF/C filters) in the field for nitrate analysis, and all samples were preserved with concentrated sulfuric acid to pH 2. Total nitrogen samples underwent digestion prior to analysis (Standard Methods 4500-N.C). Total nitrogen and nitrate were measured via second-derivative ultraviolet spectroscopy (Crumpton et al., 1992; Childress et al., 1999) using an HP 8453 Spectrophotometer.

High Frequency Sensor

Field Collection: A YSI KorEXO Multiparameter Water Quality Sondes was deployed in the surface waters at the deep site of Green Valley Lake. The sonde recorded chlorophyll-a, phycocyanin, and dissolved oxygen concentrations; dissolved oxygen saturation, water temperature, pH, specific conductivity, and total dissolved solids every 30 minutes

Zooplankton

Field Collection: Zooplankton were collected at the historic deep site of Green Valley Lake during the summer months (May to September) in 2019. The zooplankton data include samples that were collected by the research team at the ISU Limnology Laboratory and the Iowa DNR Ambient Lake Monitoring Program. However, all samples followed the same field methods and were counted by the ISU Limnology Laboratory directed by PI Wilkinson. Zooplankton samples were collected using a vertical Wisconsin net tow (63 micro-meter mesh size) from 1m above the bottom sediments to the surface of the lake. Samples were preserved in a 10% formalin solution containing sucrose and later transferred to 70% ethanol.

Counting: For each sample, a 1 mL subsample was taken and a minimum of 60 individual zooplankton were identified to genus for cladocerans and rotifers, order for copepods, and class for ostracods. Copepod nauplii could not be identified to order and were simply identified as nauplii. If less than 60 organisms were in the subsample, a second 1 mL subsample was counted. Zooplankton lengths were measured for up to 25 individuals per taxon per sample to calculate dry mass per liter using length-mass regressions (McCauley, 1984; Dumont et al., 1975).

Phytoplankton

Field Collection: Phytoplankton were collected at the historic deep site of Green Valley Lake during the summer months (May to September) in 2019. Phytoplankton samples were a composite sample over depth. Water was collected in a 4 L Van Dorn sampler from 0.25, 1, 2, 3, and 4 m depths (the top of the thermocline), then mixed in a 20 L carboy in the field. A 1 L sample from the carboy was taken following thorough mixing and preservation with Lugol’s solution in the field.

Counting: The 1 L phytoplankton sample was transferred to a graduated cylinder and allowed to settle in a dark environment for 8 days before remvoing the supernatant with a vacuum pump, leaving 50 mL of concentrated sample. A subsample was then removed from the concentrated sample in order to identify and enumerate individuals using a modified Palmer-Maloney chamber. Phytoplankton were identified to genus and a minimum of 300 natural units across 8 fields were measured. Biovolum per liter was calculated based on phytoplankton shape and converted to wet biomass per liter assuming a 1:1 ratio between wet mass and biovolume (Hilebrand et al 1999; Sournia, 1978).

Size Structure

Measurement: Measurements of size were collected from both zooplankton and phytoplankton from samples collected at the historic deep site of Green Valley Lake during the summer months (May to September) in 2019. Phytoplankton size was measured as the greatest axial linear distance which is the greatest distance across an individual cell, colony, or filament (i.e., natural unit), such as would be encountered by a zooplankton grazer. Zooplankton size was measures as both body length and dry mass determined from length-mass regressions (McCauley, 1984; Dumont et al., 1975).

Methods References:

APHA. 2005. Standard methods for the examination of water and waste-water, American Public Health Association.

Childress, C.J.O., W.T. Foreman, B.F. Conner, and T.J. Maloney. 1999. New Reporting Procedures Based on Long-Term Method Detection Levels and Some Considerations for Interpretations of Water-Quality Data Provided by the U.S. Geological Survey National Water Quality Laboratory. U.S. Geological Survey Open File Report 99-193. 24 p.

Crumpton, W.G., T.M. Isenhart, and P.D. Mitchel. 1992. Nitrate and organic N analyses with second-derivative spectroscopy. Limnology and Oceanography 37:907-913.

Dumont, H. J. et al. (1975) The dry weight estimate of biomass in a selection of Cladocera, Copepoda and Rotifera from the plankton, periphyton and benthos of continental waters. Oecologia, 19, 75–97.

Hillebrand, H. et al. (1999) Biovolume calculation for pelagic and benthic microalgae. J. Phycol., 35, 403–424

McCauley, E. (1984) The estimation of the abundance and biomass of zooplankton in samples. In Downing, J. and Rigler, F. (eds), A manual on methods for the assessment of secondary productivity in fresh waters. Blackwell Publishing Ltd, Oxford (UK), pp. 228–265.

Murphy, J., and J.P. Riley. 1962. A modified single solution method for the determination of phosphate in natural waters. Analytica Chimica Acta 27:31-36.

Standard Methods for the Examination of Water and Wastewater. 1998. 20th Edition. Method 4500-P E.

Sournia, A. (1978) Phytoplankton Manual. Monographs on Oceanographic Methodology. UNESCO, Paris.

People and Organizations

Publishers:
Organization:Environmental Data Initiative
Email Address:
info@edirepository.org
Web Address:
https://edirepository.org
Id:https://ror.org/0330j0z60
Creators:
Individual: Tyler J Butts
Organization:UW-Madison
Email Address:
tjbutts@wisc.edu
Id:https://orcid.org/0000-0002-3562-365X
Individual: Eric K Moody
Organization:Middlebury
Email Address:
ekmoody@middlebury.edu
Id:https://orcid.org/0000-0002-7484-448X
Individual: Grace M Wilkinson
Organization:UW-Madison
Email Address:
gwilkinson@wisc.edu
Id:https://orcid.org/0000-0003-4051-2249
Individual: Riley L Barbour
Organization:Iowa State University
Email Address:
rbarbour@iastate.edu
Contacts:
Individual: Tyler J Butts
Organization:UW-Madison
Email Address:
tjbutts@wisc.edu
Id:https://orcid.org/0000-0002-3562-365X
Associated Parties:
Individual: Grace M Wilkinson
Organization:UW-Madison
Email Address:
gwilkinson@wisc.edu
Id:https://orcid.org/0000-0003-4051-2249
Role:Collaborator
Individual: Rachel F King
Organization:Iowa State University
Email Address:
rfleck@iastate.edu
Role:Lab Technician
Individual: Quin Shingai
Organization:Iowa State University
Email Address:
kshingai@iastate.edu
Role:Field and Lab Technician
Individual: Shania Walker
Organization:Iowa State University
Email Address:
walkersm@iastate.edu
Role:Field Technician
Individual: Halle Rosenboom
Organization:Iowa State University
Email Address:
haller@iastate.edu
Role:Field Technician
Individual: Riley L Barbour
Organization:Iowa State University
Email Address:
rbarbour@iastate.edu
Role:Lab Technician

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period
Begin:
2019-05-01
End:
2019-09-30
Sampling Site: 
Description:Green Valley Lake. A hypereutrophic reservoir built in 1952 as an impoundment of the Platte River in southwestern Iowa, USA. Located within Green Valley State Park near the town of Creston, Iowa.
Site Coordinates:
Longitude (degree): -94.3839Latitude (degree): 41.09832
Taxonomic Range:
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Rank Value:Animalia
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Classification:
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Classification:
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ID: 281
Classification:
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ID: 545
Classification:
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ID: 9421786
Classification:
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Classification:
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Identifer:https://gbif.org
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Classification:
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Classification:
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Identifer:https://gbif.org
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Identifer:https://gbif.org
ID: 186
Classification:
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Identifer:https://gbif.org
ID: 1063
Classification:
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Identifer:https://gbif.org
ID: 8453
Classification:
Rank Name:genus
Rank Value:Pompholyx
Identifer:https://gbif.org
ID: 8393529
Classification:
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Identifer:https://gbif.org
ID: 1
Classification:
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Identifer:https://gbif.org
ID: 91
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Identifer:https://gbif.org
ID: 307
Classification:
Rank Name:order
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Identifer:https://gbif.org
ID: 1235
Classification:
Rank Name:family
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Identifer:https://gbif.org
ID: 8115
Classification:
Rank Name:genus
Rank Value:Trichocerca
Identifer:https://gbif.org
ID: 1001946
Classification:
Rank Name:kingdom
Rank Value:Animalia
Identifer:https://gbif.org
ID: 1
Classification:
Rank Name:phylum
Rank Value:Rotifera
Identifer:https://gbif.org
ID: 91
Classification:
Rank Name:class
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Identifer:https://gbif.org
ID: 307
Classification:
Rank Name:order
Rank Value:Flosculariaceae
Identifer:https://gbif.org
ID: 1005
Classification:
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Identifer:https://gbif.org
ID: 7517
Classification:
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Identifer:https://gbif.org
ID: 1000456
Classification:
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Identifer:https://gbif.org
ID: 4
Classification:
Rank Name:phylum
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Identifer:https://gbif.org
ID: 98
Classification:
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Identifer:https://gbif.org
ID: 7947184
Classification:
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Identifer:https://gbif.org
ID: 1101
Classification:
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Identifer:https://gbif.org
ID: 7149
Classification:
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Identifer:https://gbif.org
ID: 3192674
Classification:
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ID: 4
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ID: 7947184
Classification:
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ID: 4
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Identifer:https://gbif.org
ID: 98
Classification:
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Identifer:https://gbif.org
ID: 7947184
Classification:
Rank Name:order
Rank Value:Thalassiosirales
Identifer:https://gbif.org
ID: 508
Classification:
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Rank Value:Stephanodiscaceae
Identifer:https://gbif.org
ID: 2981
Classification:
Rank Name:genus
Rank Value:Stephanodiscus
Identifer:https://gbif.org
ID: 3193250
Classification:
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Rank Value:Plantae
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ID: 6
Classification:
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Identifer:https://gbif.org
ID: 36
Classification:
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Identifer:https://gbif.org
ID: 329
Classification:
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Identifer:https://gbif.org
ID: 632
Classification:
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Identifer:https://gbif.org
ID: 8816
Classification:
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Identifer:https://gbif.org
ID: 5271044
Classification:
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Identifer:https://gbif.org
ID: 6
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Classification:
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ID: 329
Classification:
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Identifer:https://gbif.org
ID: 7429582
Classification:
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Identifer:https://gbif.org
ID: 8795
Classification:
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Classification:
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Classification:
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Classification:
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ID: 8849
Classification:
Rank Name:genus
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ID: 2647648
Classification:
Rank Name:kingdom
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ID: 4
Classification:
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ID: 98
Classification:
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ID: 7073563
Classification:
Rank Name:order
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ID: 600
Classification:
Rank Name:family
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ID: 4581
Classification:
Rank Name:genus
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ID: 3195066
Classification:
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Classification:
Rank Name:phylum
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ID: 69
Classification:
Rank Name:class
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ID: 257
Classification:
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ID: 1081
Classification:
Rank Name:family
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Classification:
Rank Name:genus
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Classification:
Rank Name:kingdom
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ID: 4
Classification:
Rank Name:phylum
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ID: 69
Classification:
Rank Name:class
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Identifer:https://gbif.org
ID: 257
Classification:
Rank Name:order
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ID: 1083
Classification:
Rank Name:family
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ID: 2900
Classification:
Rank Name:genus
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ID: 3202599
Classification:
Rank Name:kingdom
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Classification:
Rank Name:phylum
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Classification:
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Classification:
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Classification:
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ID: 3216476
Classification:
Rank Name:kingdom
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ID: 1
Classification:
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Classification:
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Classification:
Rank Name:order
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ID: 1456
Classification:
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ID: 4304743
Classification:
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Classification:
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Classification:
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Classification:
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Classification:
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Classification:
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Classification:
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Classification:
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Classification:
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Classification:
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Identifer:https://gbif.org
ID: 2884
Classification:
Rank Name:genus
Rank Value:Dolichospermum
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ID: 5428755
Classification:
Rank Value:Copepod nauplii
Classification:
Rank Value:bacillariophyte
Classification:
Rank Value:chlorophyte

Project

Parent Project Information:

Title:Study of Green Valley Lake Stratification and Phosphorus Cycling
Personnel:
Individual: Grace M Wilkinson
Email Address:
gwilkinson@wisc.edu
Id:https://orcid.org/0000-0003-4051-2249
Role:Principal Investigator
Funding: Iowa Department of Natural Resources 19CRDLWBMBALM-0010
Related Project:
Title:National Science Foundation- GRFP
Personnel:
Individual: Tyler J Butts
Email Address:
tjbutts@wisc.edu
Id:https://orcid.org/0000-0002-3562-365X
Role:Principal Investigator
Funding: National Science Foundation DGE-1747503
Related Project:
Title:CAREER: Control Points on nutrient cycling in hypereutrophic lakes
Personnel:
Individual: Grace M Wilkinson
Email Address:
gwilkinson@wisc.edu
Id:https://orcid.org/0000-0003-4051-2249
Role:Principal Investigator
Funding: National Science Foundation 2200391
Related Project:
Title:How will reduced nitrogen loading affect temperate lake ecosystems rich in phosphorus?
Personnel:
Individual: Eric K Moody
Id:https://orcid.org/0000-0002-7484-448X
Role:Principal Investigator
Funding: USDA 2018-09746

Maintenance

Maintenance:
Description:completed
Frequency:
Other Metadata

Additional Metadata

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        |     |     |     |___text '\n        '
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Additional Metadata

additionalMetadata
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        |     |___element 'emlEditor'
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        |     |     |     |___text 'EMLassemblyline'
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        |     |     |___element 'release'
        |     |     |     |___text '3.5.4'
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