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Zooplankton biomass and density collected from R/V LAURENTIAN and other small boats in Lake Michigan in the Great Lakes region from 2010-04-12 to 2019-11-20 (NCEI Accession 0260131)


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            title:  Zooplankton biomass and density collected from R/V LAURENTIAN and other small boats in Lake Michigan in the Great Lakes region from 2010-04-12 to 2019-11-20 (NCEI Accession 0260131)
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                individualName:  Henry Vanderploeg
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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 15 stations during the open water season in Lake Michigan from 2010-2019. Note, no samples were collected in Lake Michigan in 2012, efforts were instead put towards Lake Huron for the Cooperative Science and Monitoring Initiative (CSMI) that year. 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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                    date:  2022-09-21
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              Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/400 water depth
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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). In the case of large predatory cladocerans, all individuals were measured or up to 100 individuals if more than that were present. Biomasses were determined using published length-weight regressions (Culver et al. 1985, Makarewicz and Jones 1990). 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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                fees:  In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
                orderingInstructions:  Contact NCEI for other distribution options and instructions.
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                    linkage: https://www.ncei.noaa.gov/archive/accession/0260131
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                    linkage: https://www.ncei.noaa.gov/archive/accession/oas/260131
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                    description:  These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).
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                description:  NCEI Accession 0260131 v1.1 was published.
                dateTime:
                  DateTime:  2022-10-04T13:59:32Z
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                        title:  NCEI Accession 0260131 v1.1
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                                    linkage: https://www.ncei.noaa.gov/archive/accession/0260131/1.1
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                                    name:  NCEI Accession 0260131 v1.1
                                    description:  published 2022-10-04T13:59:32Z
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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-m diameter, 2-m long, 153 or 64-µm conical plankton net; Data Quality Method: Counts and identifications were analyzed by Cavaletto..
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                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-m diameter, 2-m long, 153 or 64-µm conical plankton net; Data Quality Method: Counts and identifications were analyzed by Cavaletto..
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        maintenanceNote:  Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
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            organisationName:  NOAA National Centers for Environmental Information
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                code:  net - zooplankton net
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