. Animal communities in temperate America, as illustrated in the Chicago region ; a study in animal ecology. Animal ecology; Zoology. SUCCESSION OF COMMUNITIES 113 ecologically similar to the present fish community 5. This is repre- sented in the lower waters of Bull Creek—stage F, Ecological succession is one of the few biological fields in which pre- diction is possible. We may carry this discussion a little farther. We have noted that the developing streams continue to erode their beds, grow larger, and bring down the surface of the land. These processes have not stopped in Bull Creek; it w
. Animal communities in temperate America, as illustrated in the Chicago region ; a study in animal ecology. Animal ecology; Zoology. SUCCESSION OF COMMUNITIES 113 ecologically similar to the present fish community 5. This is repre- sented in the lower waters of Bull Creek—stage F, Ecological succession is one of the few biological fields in which pre- diction is possible. We may carry this discussion a little farther. We have noted that the developing streams continue to erode their beds, grow larger, and bring down the surface of the land. These processes have not stopped in Bull Creek; it will become larger, contain a larger volume of water at the locality 5, and the fish community of locality 5. Fig. 69.—This figure is based on Fig. 68. The profiles of the streams shown here are separated vertically at the mouth. The curved hnes represent seven stream stages as follows: B, Glencoe Brook; C, hypothetical stage; D, hypothetical stage; E, County Line Creek; F, Pettibone Creek; G, hypothetical stage; H, Bull Creek- Dead River. The hypothetical stages could, no doubt, be found along the shore of Lake Michigan; the difficulty arises from the introduction of sewage into so many streams. The comparative size of the mouth of each stream stage is represented by a stream cross-section at the right. The direction of reading in succession is indicated by the vertical line with the arrowheads pointing downward. The oblique lines marked i-i, 2-2, ^-;^, etc., pass through points in the stream profiles which are in the same physiographic condition and occupied by similar fish communities. will be succeeded by a fish community ecologically similar to that now at locality 6. This stage has been designated as hypothetical stage G in the diagram. With a further continuation of the process, the fish community of stage G, locality 6, will be succeeded by a fish community ecologically similar to that now found at the locality 7 (Dead River)—? stage H. The communities of every str
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
