Dataset: neuston
Deployment: FR0208

In the laboratory, the samples were washed over a 0.320-mm mesh sieve with tap water to remove formalin, then transferred to water. Additional extraneous contents were subsequently removed. To obtain displacement volumes, samples were allowed to settle overnight in Imhoff settling cones or graduated cylinders depending on the sample volume. Biovolumes (ml per 100 m3) were calculated from displacement volumes and flowmeter readings.

Sample was transferred to a clear Pyrex dish on a white background for sorting and removing zooplankton .5 mm using a lighted magnifying glass. This size fraction was chosen based on prey size selected by juvenile coho and Chinook salmon in previous trophic analyses (Brodeur, 1991; Schabetsberger et al., 2003). Occasionally, large samples with many macrozooplankton were subsampled with a Folsom plankton splitter and the counts estimated. The macrozooplankton were enumerated and identified to the lowest practical taxon using a dissecting microscope. Life stages of the specimens were determined when possible. Completed samples were transferred to 70% ethanol. Counts were standardized into concentrations expressed as numbers per 100 m³.

<p>In the laboratory, the samples were washed over a 0.320-mm mesh sieve with tap water to remove formalin, then transferred to water. Additional extraneous contents were subsequently removed. To obtain displacement volumes, samples were allowed to settle overnight in Imhoff settling cones or graduated cylinders depending on the sample volume. Biovolumes (ml per 100 m3) were calculated from displacement volumes and flowmeter readings. Sample was transferred to a clear Pyrex dish on a white background for sorting and removing zooplankton .5 mm using a lighted magnifying glass. This size fraction was chosen based on prey size selected by juvenile coho and Chinook salmon in previous trophic analyses (Brodeur, 1991; Schabetsberger et al., 2003).</p>