. Animal communities in temperate America, as illustrated in the Chicago region ; a study in animal ecology. Animal ecology; Zoology. INTERMITTENT STREAMS 87 easily weathered and eroded, containing bowlders, gravel, and occasional strata of hard rock. 2. THE INTERMITTENT STREAM COMMUNITIES (Stations 4-8; Tables XVII, XVIII) There are two types of these—intermittent rapids and pool An Intermittent Stream Fig. 24.—The young stream at Glencoe in spring at high water, showing the leaf-barren trees. Fig. 25.—The same in summer, showing the stream entirely drj-. a) Temporary rapids con
. Animal communities in temperate America, as illustrated in the Chicago region ; a study in animal ecology. Animal ecology; Zoology. INTERMITTENT STREAMS 87 easily weathered and eroded, containing bowlders, gravel, and occasional strata of hard rock. 2. THE INTERMITTENT STREAM COMMUNITIES (Stations 4-8; Tables XVII, XVIII) There are two types of these—intermittent rapids and pool An Intermittent Stream Fig. 24.—The young stream at Glencoe in spring at high water, showing the leaf-barren trees. Fig. 25.—The same in summer, showing the stream entirely drj-. a) Temporary rapids consocies (Figs. 24, 25).—Small gullies in which water runs only when it is raining do not have any aquatic residents. As soon as such a gully has cut a channel deep enough to stand below ground-water level during a few days or weeks of the rainy season, aquatic insects make their appearance. The species which is usually found in the smallest trickle of water is the larva of the black fly, Simulitim (Figs. 27-32). As the stream grows a little larger, and per- haps even at such a young stage also, we sometimes find the nymphs. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shelford, Victor E. (Victor Ernest), b. 1877; Metcalf Collection (North Carolina State University). NCRS. Chicago, Ill. , Pub. for the Geographic Society of Chicago by the University of Chicago Press
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
