gov.noaa.nodc:0247568 eng utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2025-12-14T19:40:53Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Zooplankton biomass and density collected from R/V LAURENTIAN, R/V LAKE GUARDIAN, AND R/V SHENEHON in Lake Michigan in the Great Lakes region from 1994-04-21 to 2004-08-19 (NCEI Accession 0247568) 2022-03-21 publication 2022-02-09 creation NOAA National Centers for Environmental Information gov.noaa.nodc:0247568 NCEI Archive Management System 0247568 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher Lacey Mason NOAA Great Lakes Environmental Research Laboratory (GLERL) lacey.mason@noaa.gov http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information resourceProvider NOAA Great Lakes Environmental Research Laboratory (GLERL) http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information resourceProvider Henry Vanderploeg NOAA Great Lakes Environmental Research Laboratory (GLERL) henry.vanderploeg@noaa.gov http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information principalInvestigator Joann Cavaletto NOAA Great Lakes Environmental Research Laboratory (GLERL) joann.cavaletto@noaa.gov http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information collaborator Lacey Mason NOAA Great Lakes Environmental Research Laboratory (GLERL) lacey.mason@noaa.gov http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information pointOfContact NOAA Great Lakes Environmental Research Laboratory (GLERL) NOAA GLERL Data Manager oar.glerl.data@noaa.gov http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information pointOfContact Cavaletto, Joann NOAA Great Lakes Environmental Research Laboratory http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information author Vanderploeg, Henry NOAA Great Lakes Environmental Research Laboratory http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information author Pothoven, Steven A. NOAA Great Lakes Environmental Research Laboratory http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information author Agy, Megan A. author NOAA Great Lakes Environmental Research Laboratory http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information author NOAA Great Lakes Environmental Research Laboratory (GLERL) http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information contributor tableDigital 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 select 32 stations during the open water season in Lake Michigan from 1994-2004. Zooplankton density is given in the number of organisms per cubic meter and biomass is given in milligrams per cubic meter. This data accession also includes samples collected in support of the NOAA/GLERL Episodic Events - Great Lakes Experiment (EEGLE) from 1998-2001. File formats included in this data package are .csv, shapefiles, and jpg. These data were collected to study the lower food web dynamics in Lake Michigan. Funding Agency: USEPA Great Lakes National Program Office Funding Agency: National Science Foundation (NSF); Division of Ocean Sciences Funding Agency: NOAA Coastal Ocean Program (COP) Funding Agency: NOAA Great Lakes Environmental Research Laboratory completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0247568 Preview graphic PNG 0247568 NCEI ACCESSION NUMBER 2022-01-26 publication ZOOPLANKTON BIOMASS ZOOPLANKTON DENSITIES theme NODC DATA TYPES THESAURUS microscope net - zooplankton net instrument NODC INSTRUMENT TYPES THESAURUS biological laboratory analyses theme NODC OBSERVATION TYPES THESAURUS LAURENTIAN SHENEHON USEPA Lake Guardian platform NODC PLATFORM NAMES THESAURUS NOAA Great Lakes Environmental Research Laboratory dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS NOAA Great Lakes Environmental Research Laboratory dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Great Lakes place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication DOC/NOAA/OAR/GLERL > Great Lakes Environmental Research Laboratory, OAR, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian NOAA/GLERL Ecosystem Dynamics project Provider Project Names EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian MICROSCOPES > MICROSCOPES PLANKTON NETS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Ships platform Global Change Master Directory (GCMD) Platform Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian LAURENTIAN (ICES code: 33LA) SHENEHON (ICES code: 32UZ) platform ICES/SeaDataNet Ship Codes R/V LAKE GUARDIAN R/V LAURENTIAN R/V SHENEHON platform Provider Platforms CONTINENT > NORTH AMERICA > CANADA > GREAT LAKES, CANADA CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GREAT LAKES place Global Change Master Directory (GCMD) Location Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Lake Michigan place Provider Place Names GRDM3T Send2NCEI Submission Package ID accessLevel: Public otherRestrictions Cite as: Cavaletto, Joann; Vanderploeg, Henry; Pothoven, Steven A.; Agy, Megan A.; NOAA Great Lakes Environmental Research Laboratory (2022). Zooplankton biomass and density collected from R/V LAURENTIAN, R/V LAKE GUARDIAN, AND R/V SHENEHON in Lake Michigan in the Great Lakes region from 1994-04-21 to 2004-08-19 (NCEI Accession 0247568). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0247568. Accessed [date]. Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. Changes in the nearshore and offshore zooplankton communities of southeastern Lake Michigan 2001 publication https://www.glerl.noaa.gov/pubs/fulltext/2001/20010016.pdf https://www.glerl.noaa.gov/pubs/fulltext/2001/20010016.pdf HTTPS Zooplankton thesis master's thesis fileAccess Agy, M.A. author School of Natural Resources and Environment, University of Michigan https://seas.umich.edu/ HTTPS website Institution web page information publisher documentDigital Masters thesis crossReference Culver, D. A., Boucherle, M. M., Bean, D. J., & Fletcher, J. W. (1985). Biomass of Freshwater Crustacean Zooplankton from Length–Weight Regressions. Canadian Journal of Fisheries and Aquatic Sciences, 42(8), 1380–1390. https://doi.org/10.1139/f85-173 1985-08-01 publication International DOI Foundation (IDF) https://doi.org/10.1139/f85-173 https://doi.org/10.1139/f85-173 HTTPS https://doi.org/10.1139/f85-173 journal article information Culver, David A. author Boucherle, Mary M. author Bean, David J. author Fletcher, James W. author Canadian Science Publishing publisher documentDigital Can. J. Fish. Aquat. Sci. 42(8) ISSN 0706-652X, ISSN 1205-7533, pp. 1380-1390 crossReference HANEY, J. F., & HALL, D. J. (1973). Sugar‐coated Daphnia: A preservation technique for Cladocera1. Limnology and Oceanography, 18(2), 331–333. https://doi.org/10.4319/lo.1973.18.2.0331 1973-03 publication International DOI Foundation (IDF) https://doi.org/10.4319/lo.1973.18.2.0331 https://doi.org/10.4319/lo.1973.18.2.0331 HTTPS https://doi.org/10.4319/lo.1973.18.2.0331 journal article information HANEY, JAMES F. author HALL, DONALD J. author Wiley publisher documentDigital Limnology & Oceanography 18(2) ISSN 0024-3590, ISSN 1939-5590, pp. 331-333 crossReference Hawkins, B. E., & Evans, M. S. (1979). Seasonal Cycles of Zooplankton Biomass in Southeastern Lake Michigan. Journal of Great Lakes Research, 5(3–4), 256–263. https://doi.org/10.1016/s0380-1330(79)72152-6 1979-01 publication International DOI Foundation (IDF) https://doi.org/10.1016/s0380-1330(79)72152-6 https://doi.org/10.1016/s0380-1330(79)72152-6 HTTPS https://doi.org/10.1016/s0380-1330(79)72152-6 journal article information Hawkins, Bethany E. author Evans, Marlene S. author Elsevier BV publisher documentDigital Journal of Great Lakes Research 5(3-4) ISSN 0380-1330, pp. 256-263 crossReference Makarewicz, J. C., & Jones, H. D. (1990). Occurrence of Bythotrephes Cederstroemi in Lake Ontario Offshore Waters. Journal of Great Lakes Research, 16(1), 143–147. https://doi.org/10.1016/s0380-1330(90)71407-4 1990-01 publication International DOI Foundation (IDF) https://doi.org/10.1016/s0380-1330(90)71407-4 https://doi.org/10.1016/s0380-1330(90)71407-4 HTTPS https://doi.org/10.1016/s0380-1330(90)71407-4 journal article information Makarewicz, Joseph C. author Jones, H. Douglas author Elsevier BV publisher documentDigital Journal of Great Lakes Research 16(1) ISSN 0380-1330, pp. 143-147 crossReference POTHOVEN, S. A., VANDERPLOEG, H. A., CAVALETTO, J. F., KRUEGER, D. M., MASON, D. M., & BRANDT, S. B. (2007). Alewife planktivory controls the abundance of two invasive predatory cladocerans in Lake Michigan. Freshwater Biology, 52(3), 561–573. https://doi.org/10.1111/j.1365-2427.2007.01728.x 2007-02-12 publication International DOI Foundation (IDF) https://doi.org/10.1111/j.1365-2427.2007.01728.x https://doi.org/10.1111/j.1365-2427.2007.01728.x HTTPS https://doi.org/10.1111/j.1365-2427.2007.01728.x journal article information POTHOVEN, STEVEN A. author VANDERPLOEG, HENRY A. author CAVALETTO, JOANN F. author KRUEGER, DAMON M. author MASON, DORAN M. author BRANDT, STEPHEN B. author Wiley publisher documentDigital Freshwater Biology 52(3) ISSN 0046-5070, ISSN 1365-2427, pp. 561-573 crossReference Vanderploeg, H. A., Johengen, T. H., Lavrentyev, P. J., Chen, C., Lang, G. A., Agy, M. A., Bundy, M. H., Cavaletto, J. F., Eadie, B. J., Liebig, J. R., Miller, G. S., Ruberg, S. A., & McCormick, M. J. (2007). Anatomy of the recurrent coastal sediment plume in Lake Michigan and its impacts on light climate, nutrients, and plankton. Journal of Geophysical Research: Oceans, 112(C3). https://doi.org/10.1029/2004jc002379 2007-03 publication International DOI Foundation (IDF) https://doi.org/10.1029/2004jc002379 https://doi.org/10.1029/2004jc002379 HTTPS https://doi.org/10.1029/2004jc002379 journal article information Vanderploeg, H. A. Great Lakes Environmental Research Laboratory National Oceanic and Atmospheric Administration Ann Arbor Michigan USA author Johengen, T. H. Cooperative Institute for Limnology and Ecosystem Research Ann Arbor Michigan USA author Lavrentyev, P. J. Department of Biology University of Akron Akron Ohio USA author Chen, C. School of Marine Science and Technology University of Massachusetts–Dartmouth Dartmouth Massachusetts USA author Lang, G. A. Great Lakes Environmental Research Laboratory National Oceanic and Atmospheric Administration Ann Arbor Michigan USA author Agy, M. A. School of Natural Resources and the Environment University of Michigan Ann Arbor Michigan USA author Bundy, M. H. Office of Polar Programs National Science Foundation Arlington Virginia USA author Cavaletto, J. F. Great Lakes Environmental Research Laboratory National Oceanic and Atmospheric Administration Ann Arbor Michigan USA author Eadie, B. J. Great Lakes Environmental Research Laboratory National Oceanic and Atmospheric Administration Ann Arbor Michigan USA author Liebig, J. R. Great Lakes Environmental Research Laboratory National Oceanic and Atmospheric Administration Ann Arbor Michigan USA author Miller, G. S. Great Lakes Environmental Research Laboratory National Oceanic and Atmospheric Administration Ann Arbor Michigan USA author Ruberg, S. A. Great Lakes Environmental Research Laboratory National Oceanic and Atmospheric Administration Ann Arbor Michigan USA author McCormick, M. J. Great Lakes Environmental Research Laboratory National Oceanic and Atmospheric Administration Ann Arbor Michigan USA author American Geophysical Union (AGU) publisher documentDigital J. Geophys. Res. 112(C3) ISSN 0148-0227 crossReference Vanderploeg, H. A., Ludsin, S. A., Ruberg, S. A., Höök, T. O., Pothoven, S. A., Brandt, S. B., Lang, G. A., Liebig, J. R., & Cavaletto, J. F. (2009). Hypoxia affects spatial distributions and overlap of pelagic fish, zooplankton, and phytoplankton in Lake Erie. Journal of Experimental Marine Biology and Ecology, 381, S92–S107. https://doi.org/10.1016/j.jembe.2009.07.027 2009-12 publication International DOI Foundation (IDF) https://doi.org/10.1016/j.jembe.2009.07.027 https://doi.org/10.1016/j.jembe.2009.07.027 HTTPS https://doi.org/10.1016/j.jembe.2009.07.027 journal article information Vanderploeg, Henry A. author Ludsin, Stuart A. author Ruberg, Steven A. author Höök, Tomas O. author Pothoven, Steven A. author Brandt, Stephen B. author Lang, Gregory A. author Liebig, James R. author Cavaletto, Joann F. author Elsevier BV publisher documentDigital Journal of Experimental Marine Biology and Ecology 381 ISSN 0022-0981, pp. S92-S107 crossReference Vanderploeg, H. A., Ludsin, S. A., Cavaletto, J. F., Höök, T. O., Pothoven, S. A., Brandt, S. B., Liebig, J. R., & Lang, G. A. (2009). Hypoxic zones as habitat for zooplankton in Lake Erie: Refuges from predation or exclusion zones? Journal of Experimental Marine Biology and Ecology, 381, S108–S120. https://doi.org/10.1016/j.jembe.2009.07.015 2009-12 publication International DOI Foundation (IDF) https://doi.org/10.1016/j.jembe.2009.07.015 https://doi.org/10.1016/j.jembe.2009.07.015 HTTPS https://doi.org/10.1016/j.jembe.2009.07.015 journal article information Vanderploeg, Henry A. author Ludsin, Stuart A. author Cavaletto, Joann F. author Höök, Tomas O. author Pothoven, Steven A. author Brandt, Stephen B. author Liebig, James R. author Lang, Gregory A. author Elsevier BV publisher documentDigital Journal of Experimental Marine Biology and Ecology 381 ISSN 0022-0981, pp. S108-S120 crossReference Vanderploeg, H. A., Pothoven, S. A., Fahnenstiel, G. L., Cavaletto, J. F., Liebig, J. R., Stow, C. A., Nalepa, T. F., Madenjian, C. P., & Bunnell, D. B. (2012). Seasonal zooplankton dynamics in Lake Michigan: Disentangling impacts of resource limitation, ecosystem engineering, and predation during a critical ecosystem transition. Journal of Great Lakes Research, 38(2), 336–352. https://doi.org/10.1016/j.jglr.2012.02.005 2012-06 publication International DOI Foundation (IDF) https://doi.org/10.1016/j.jglr.2012.02.005 https://doi.org/10.1016/j.jglr.2012.02.005 HTTPS https://doi.org/10.1016/j.jglr.2012.02.005 journal article information Vanderploeg, Henry A. author Pothoven, Steven A. author Fahnenstiel, Gary L. author Cavaletto, Joann F. author Liebig, James R. author Stow, Craig A. author Nalepa, Thomas F. author Madenjian, Charles P. author Bunnell, David B. author Elsevier BV publisher documentDigital Journal of Great Lakes Research 38(2) ISSN 0380-1330, pp. 336-352 crossReference Vanderploeg, H. A., Pothoven, S. A., Krueger, D., Mason, D. M., Liebig, J. R., Cavaletto, J. F., Ruberg, S. A., Lang, G. A., & Ptáčníková, R. (2015). Spatial and predatory interactions of visually preying nonindigenous zooplankton and fish in Lake Michigan during midsummer. Journal of Great Lakes Research, 41, 125–142. https://doi.org/10.1016/j.jglr.2015.10.005 2015 publication International DOI Foundation (IDF) https://doi.org/10.1016/j.jglr.2015.10.005 https://doi.org/10.1016/j.jglr.2015.10.005 HTTPS https://doi.org/10.1016/j.jglr.2015.10.005 journal article information Vanderploeg, Henry A. author Pothoven, Steven A. author Krueger, Damon author Mason, Doran M. author Liebig, James R. author Cavaletto, Joann F. author Ruberg, Steven A. author Lang, Gregory A. author Ptáčníková, Radka author Elsevier BV publisher documentDigital Journal of Great Lakes Research 41 ISSN 0380-1330, pp. 125-142 crossReference eng; USA utf8 environment oceans biota -87.725 -86.281 41.64 43.24 1994-04-21 2004-08-19 Any differences in sample collection or processing is noted in the methods section below. Methods for Lake Michigan zooplankton: Zooplankton were collected with a 0.5 or 1 meter diameter, 153 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 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 (or 600 for EEGLE project) 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. For copepods, both cyclopoid and calanoid nauplii were combined, 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 (or 5% for the EEGLE project) 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). NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact 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. Contact NCEI for other distribution options and instructions. JPEG CSV Shapefile 1.28 https://www.ncei.noaa.gov/archive/accession/0247568 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/oas/247568 HTTPS Web browser Descriptive Information Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/download/247568 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0197/0247568/ FTP Any FTP client FTP 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). download dataset NCEI Accession 0247568 v1.1 was published. 2022-03-21T16:13:15Z NCEI Accession 0247568 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0247568/1.1 HTTPS NCEI Accession 0247568 v1.1 published 2022-03-21T16:13:15Z download dataset Parameter or Variable: ZOOPLANKTON BIOMASS (measured); Units: milligrams per cubic meter; Observation Category: model output; Sampling Instrument: net - zooplankton net; Sampling and Analyzing Method: 0.5 or 1 meter diameter, 153 µm mesh net, conical, 2m-long; Data Quality Method: Counts and identifications were cross checked between Cavaletto and Agy. 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 µm mesh net, conical, 2m-long; Data Quality Method: Counts and identifications were cross checked between Cavaletto and Agy asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian microscope microscope instrument is used in lab analyses A microscope is an instrument used to see objects that are too small for the naked eye. net - zooplankton net net - zooplankton net net - zooplankton net LAURENTIAN LAURENTIAN SHENEHON SHENEHON USEPA Lake Guardian IMO number = 8030609 Launch = 1981 reference = https://www.epa.gov/great-lakes-monitoring/lake-guardian