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<br />SAMPLING METHODS <br /> <br />Table 2. Sampling dates, methodology and comments. <br /> <br />station <br />3l-MILE-l <br />CURRANT-l <br /> <br />Date <br />06/10/94 <br />06/10/94 <br /> <br />Sampling <br />Replicate Method <br />1 SURBER <br />1 SURBER <br /> <br />Habitat <br />Samoled <br />RIFFLE <br />RIFFLE <br /> <br />Sampling <br />Area tm2.l. <br />0.279 <br />0.279 <br /> <br />Comments <br />3 composited <br />3 cornposited <br /> <br />Surbers <br />Surbers <br /> <br />LABORATORY PROCESSING <br /> <br />Samples were identified at the BLM Aquatic Ecosystem Laboratory in Logan, Utah. <br />Samples were processed following Elliott (88). Individual samples were first <br />placed in a white enamel pan and observed under a magnifying glass. Large and <br />less-numerous organisms were removed. The sample was then Bubsarnpled by <br />dispersing it evenly within a No. 60 sieve (250 micron) located in a water-filled <br />enamel pan. The sieve was then lifted out of the water and split into two equal <br />parts with a spatula. This procedure was repeated until approximately 250 organisms <br />remained in the Bub-Bample~ Organisims were removed from the sub-sample using a <br />stereoscope with 8-40X magnification~ If lesa than 250 organisms were found in <br />the subsample additional subsamples were taken. The amount of the original sample <br />which was identified is shown in Table 3. The organisms were then identified and <br />counted by well-qualified taxonomists~ An effort was made to identify organisms <br />to a consistent taxonomic level~ Insects were primarily identified to genus, with <br />the exception of Chironomidae which were identified to subfamily~ Non-insect <br />invertebrates were identified to various taxonomic levels depending on the <br />availability of identification keys. Voucher specimens were retained for all <br />unique taxa. <br /> <br />Xable 3. Percentage of each sample that was identified and any laboratory comments. <br /> <br />station <br />3l-MILE-l <br />CURRANT-l <br /> <br />Date Replicate <br />06/10/94 1 <br />06/10/94 1 <br /> <br />Field <br />split % <br />None <br />None <br /> <br />Lab <br />split % <br />7S <br />None <br /> <br />% id'd <br />75 <br />100 <br /> <br />Comments <br />None <br />None <br /> <br />II <br />