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104 105 ; , "~' Table 9. Percentage of Total Volume Contributed by Different Bottom Organisms in Four Categories of Stream Habitat of the North Fork of the White River, Colorado, 1963 Table 10. Relative Numbers and Volumes of Emerging Insects from Various Substrates in Algonquin Park, Ontario, Canada Stream habitata Number of samples Deep Deep Sha 11 ow in which tbe group of fast slow slow Riffle invertebrates qccurred Plecoptera 0.0 12.3 1.2 86.5 33 Ephemeroptera 2.3 6.4 1.6 89,7 89 Trichopte::a >1.7 >8.1 2.6 >87.5 88 Diptera 1.9 6.5 2.5 89.1 89 Coleoptera 4.3 10.6 2.2 82.9 71 Hymenoptera 0.0 0,0 0,0 100.0 1 Platyhelminthes 0.0 0,0 0,0 100.0 3 Hydracarina 0,0 24,4 4.7 70,9 40 Oligochaeta 0.0 14,3 0,0 85.7 7 Pelecypoda 0.0 0.0 50.0 50.0 1 Gastropoda 0.0 33.3 16.7 50.0 4 Nematoda 0.0 28.6 0.0 71.4 7 Substrate type Relative Relative numbers a volume a Rubble (rapid current) 4.6 20.7 Rubble (pool) 3.3 Gravel 2.1 3.6 Muck 1.8 1.5 Sand 1.0 1.0 Source: D, R. Hooper, Evaluation of the Effects of Flows on Trout Stream Ecology (Emeryville, Calif., Pacific Gas and Electric Co., Department of Engineering Research, 1973) citing W, M, Sprules, An Eco- lo~ical Investi~ation of Stream Insects in Al~onQuin Park, Ontario, Biology Series No. 56 (Toronto, University of Toronto, 1947). aAll numbers and volumes per unit of area are expressed in terms of the sand substrate which was assigned a value of 1.0. Therefore, these values refer to a multiple factor in numbers or volume of insects over the sand substrate, .. .. .. ... ... <; < .. Sourc~: Combined data for 89 samples from R. R. Hill, White River Survey (Denver, Colo., Colorado Department of Game, Fish, and Parks, Fisheries Research Division, Federal Aid Report F-26-R-2, Job 2, 1965). a f Deep re ers to water more than 1.5 feet deep; shallow, to water less than 1.5 feet deep. Fast refers to a water velocity greater than 1 foot/second; slow to velocity less than 1 foot/second. A riffle has a depth to 1.5 feet with water velocity over 1 foot/second, .. ~ ... ,; '" , ~ .. .. ~ , .. "'\0, "-4,. 1