. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12 VICTOR E. SHELFORD. value of tin- principles of physiography as outlined in the fourth. \Yith the development of the ideas of genetic physiography came Ilu- recognition of the succession of physiographic conditions over a ijveii locality (point B of Fig. i). The relations of plants ! animals to physiographic features being recognized, the first recognition of plant and animal succession came in connection with physiographic succession. Cowles ('01) carried out a complete classification of the vegetation near Chicago on th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12 VICTOR E. SHELFORD. value of tin- principles of physiography as outlined in the fourth. \Yith the development of the ideas of genetic physiography came Ilu- recognition of the succession of physiographic conditions over a ijveii locality (point B of Fig. i). The relations of plants ! animals to physiographic features being recognized, the first recognition of plant and animal succession came in connection with physiographic succession. Cowles ('01) carried out a complete classification of the vegetation near Chicago on the basis of the plant succession which accompanies physiographic // G F E D C B. FIG. i. A diagram showing the successive stages in the profile (general shape of the bottom) of a very young stream, curved lines, A—B, A—C, A-D, A-E, A-F, .1 (/. .1 •// representing the successive profiles. The uppermost horizontal line represents the surface of the land into which the stream is eroding. The horizontal line with the arrow heads indicates the direction of the migration of the source of the stream and accordingly of similar stream conditions. The vertical line with arrow heads when followed downward passess through a succession of stream condi- tions and represents physiographic succession at the locality B. The point A is the mouth of the stream. Opposite this are shown three successive sizes of the stream, and therefore succession at that point. The vertical scale is greatly exaggerated. change. Adams ('01) also discussed in general geographic terms the relations of animals to base-leveling and stream development. He referred to succession of forms in streams. Since his paper, little has been done in the study of the actual relations of animals to the various stages of stream development, or the relative importance of the activities of the animals and the dynamics of -t reams in determining distribution. In the study of all phases of distribution, animal activities have been
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
