Zooplankton biomass and density collected from small boats in Saginaw Bay, Lake Huron in the Great Lakes region from 2009-04-23 to 2010-11-10 (NCEI Accession 0256761)

Methods for Saginaw Bay, Lake Huron zooplankton

Zooplankton were collected with a 0.3 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 the bottom to the surface. 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. 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 (Hawkins and Evans 1979).