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Zooplankton biomass and density collected from the R/V LAURENTIAN and other small boats in Lake Michigan and Muskegon Lake in the Great Lakes region from 2021-05-10 to 2021-09-16 (NCEI Accession 0290558)


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      DateTime:  2024-09-17T19:23:46Z
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            title:  Zooplankton biomass and density collected from the R/V LAURENTIAN and other small boats in Lake Michigan and Muskegon Lake in the Great Lakes region from 2021-05-10 to 2021-09-16 (NCEI Accession 0290558)
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                individualName:  Eliza Lugten
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                  Anchor:  https://ror.org/01jeee804 US DOC; NOAA; OAR; Great Lakes Environmental Research Laboratory (GLERL)
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                individualName:  Cavaletto, Joann
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                individualName:  Vanderploeg, Henry
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                individualName:  Pothoven, Steven A.
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/2152 University of Michigan Cooperative Institute for Great Lakes Research
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/2152 University of Michigan Cooperative Institute for Great Lakes Research (CIGLR)
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        abstract:  NOAA Great Lakes Environmental Research Laboratory (GLERL) samples and studies the ecosystem of the lower food web of the Laurentian Great Lakes. This collection contains zooplankton biomass and density data at three stations during the open water season in Lake Michigan and one station in Muskegon Lake in 2021. Note, no samples were collected in Lake Michigan in 2020 due to COVID-19. Zooplankton density is given in the number of organisms per cubic meter and biomass is given in milligrams per cubic meter. File formats included in this data package are .csv and jpg.
        purpose:  These data were collected to study the lower food web dynamics in Lake Michigan.
        credit:  Funding Agency: USEPA Great Lakes National Program Office
        credit:  Funding Agency: US DOC; NOAA; OAR; Great Lakes Environmental Research Laboratory
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/441 ZOOPLANKTON BIOMASS
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        supplementalInformation:  Methods for Lake Michigan zooplankton Zooplankton were collected with a 0.5 or 1 meter diameter, 153 or 64 µm mesh net. The net was vertically towed through the water column at a speed of 0.5 m s-1 from 1 to 2 meters above the bottom to the surface. For partial water column tows, to collect separately the epilimnion, metalimnion and hypolimnion, a messenger actuated choke-off vertical opening/closing net (1m diameter, 2m-long, 153 or 64 µm mesh) was used to obtain the zooplankton samples. The net was washed thoroughly, but gently and the contents were carefully transferred to a sample bottle, narcotized with Alka-Seltzer, and preserved with the addition of sugar formaldehyde to form a 2% solution (Haney & Hall, 1973). Preparation for counting and identifying zooplankton required measurement of the sample volume, gentle mixing of the sample, and removal of an aliquot with a Hensen-Stempel pipette. The aliquot was held in a 100 µm meshed bottom cup and rinsed with tap water to remove the preservative and finally it was poured into a circular counting dish. A minimum 550 zooplankton were identified for each sample. To count large predatory cladocerans, such as Bythotrephes, the whole sample was rinsed through a 600 µm mesh sieve, and all individuals were counted. Taxonomic groups were identified and categorized in the following manner. Copepodites were identified to genus and adult copepods were identified to species. The cladocerans, both herbivorous and predatory, were identified to species. To determine zooplankton biomasses, length measurements were made on a subsample of taxa (10 adult copepods and 25 copepodites or cladocerans) that were over 10% of the total density using Image Pro Plus, image analysis software (Media Cybernetics, Silver Spring, MD). For zooplankton taxa that comprised less than 10% of the total density, a default weight from the literature was used to determine biomass for all taxa except Bythotrephes (Hawkins and Evans 1979).
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                  Anchor:  https://ror.org/04r0wrp59 NOAA National Centers for Environmental Information
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                description:  NCEI Accession 0290558 v1.1 was published.
                dateTime:
                  DateTime:  2024-04-01T20:20:37Z
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                        title:  NCEI Accession 0290558 v1.1
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                                    name:  NCEI Accession 0290558 v1.1
                                    description:  published 2024-04-01T20:20:37Z
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                description:  Parameter or Variable: ZOOPLANKTON BIOMASS (measured); Units: milligrams per cubic meter; Observation Category: laboratory analysis; Sampling Instrument: net - zooplankton net; Sampling and Analyzing Method: 0.5 or 1 meter diameter, 153 or 64 µm mesh net, conical, 2m-long; Data Quality Method: Counts and identifications were checked by Cavaletto, Tomczak, Lugten.
            processStep:  (LE_ProcessStep)
                description:  Parameter or Variable: ZOOPLANKTON DENSITIES (measured); Units: number per cubic meter; Observation Category: laboratory analysis; Sampling Instrument: net - zooplankton net; Sampling and Analyzing Method: 0.5 or 1 meter diameter, 153 or 64 µm mesh net, conical, 2m-long; Data Quality Method: Counts and identifications were checked by Cavaletto, Tomczak, Lugten.
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                code:  net - zooplankton net
            type:  net - zooplankton net
            description:  net - zooplankton net
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                code:  LAURENTIAN
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