Zooplankton biomass and density collected from R/V LAURENTIAN and R/V LAKE GUARDIAN in Lake Erie in the Great Lakes region from 2005-05-11 to 2007-09-20 (NCEI Accession 0265115)
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 21 stations and 4 transects during the open water season in Lake Erie in 2005 and 2007. Zooplankton density is given in the number of organisms per cubic meter and biomass is given in milligrams per cubic meter. The file format included in this data package is .csv.
Dataset Citation
- Cite as: Cavaletto, Joann; Vanderploeg, Henry; Pothoven, Steven A.; Clouse, Melissa; NOAA Great Lakes Environmental Research Laboratory (2022). Zooplankton biomass and density collected from R/V LAURENTIAN and R/V LAKE GUARDIAN in Lake Erie in the Great Lakes region from 2005-05-11 to 2007-09-20 (NCEI Accession 0265115). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0265115. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0265115
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
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NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov |
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NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 2005-05-10 to 2007-09-20 |
Spatial Bounding Box Coordinates |
West: -83.3
East: -80.5
South: 41.5
North: 42.5
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | Methods for Lake Erie zooplankton Diel Zooplankton Tows: Diel samples of zooplankton were pumped through a 64 µm mesh net. The diel samples were collected every four hours over a 24 hour period using a Sandpiper, Warren Rupp diaphragm pump at a flow rate of 2.0 liters per second. Water was pumped to 1-m above the bottom. The water column was divided into epilimnion, metalimnion and hypolimnion based on the CTD profiles of water temperature and DO concentration. If the epilimnion was very deep, it was divided into an upper and lower epilimnion during certain times of the year. A fully mixed water column was divided in half. Water was pumped at 1-m intervals in each zone for a period of time to fully sample the zone and equal approximately one cubic meter of water. Detailed methods are described in Vanderploeg et al. (2009b). Transect Zooplankton Tows: Zooplankton were collected with a 0.5 meter diameter, 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. The nets were 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. 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 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). |
Purpose | These data were collected to study the lower food web dynamics in Lake Erie in coordination with the International Field Years on Lake Erie (IFYLE). The three primary objectives of the IFYLE program were to 1) quantify the spatial extent of hypoxia across the lake, and gather information that can help forecast its timing, duration, and extent; 2) assess the ecological consequences of hypoxia to the Lake Erie food web, including phytoplankton, bacteria, microzooplankton, mesozooplankton, and fish; and 3) identify factors that control the timing, extent, and duration of HAB (including toxin) formation in Lake Erie, as well as enhance our ability to use remote sensing as a tool to rapidly map HAB distributions in the lake. |
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Last Modified: 2024-09-17T19:17:30Z
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For questions about the information on this page, please email: ncei.info@noaa.gov