. Bio-ecology. Plant ecology; Animal ecology; Botany; Ecology; Zoology. â *m .**J«,*;V. rX' ^n. pj- i.'J^\ Fig. \^..âOenothera caespitosa establishing itself in the sun-baked clay of the Bad Lands; The Great Wall, South Dakota. (Photo by Edith Clements.) As already emphasized, migration becomes effective only when fol- lowed by ecesis. The latter has usually been regarded as a natural if not regular sequel to movement, but experimental studies have shown it to be altogether exceptional (Clements and Weaver, 1924). This conclusion is reinforced by the slow changes in composition shown by the p
. Bio-ecology. Plant ecology; Animal ecology; Botany; Ecology; Zoology. â *m .**J«,*;V. rX' ^n. pj- i.'J^\ Fig. \^..âOenothera caespitosa establishing itself in the sun-baked clay of the Bad Lands; The Great Wall, South Dakota. (Photo by Edith Clements.) As already emphasized, migration becomes effective only when fol- lowed by ecesis. The latter has usually been regarded as a natural if not regular sequel to movement, but experimental studies have shown it to be altogether exceptional (Clements and Weaver, 1924). This conclusion is reinforced by the slow changes in composition shown by the plant matrix, in spite of the enormous seed production of many species. Not only must the seeds meet the vicissitudes of transport and of germination, but the highly susceptible seedlings must run the gauntlet of untoward conditions, of destructive coactions, and of un- favorable competition. The final survival represents but the merest. 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 Clements, Frederic E. (Frederic Edward), 1874-1945; Shelford, Victor E. (Victor Ernest), b. 1877. New York, J. Wiley & Sons, inc. ; London, Chapman & Hall, limited
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Keywords: ., bookcentury1900, booksubje, booksubjectbotany, booksubjectzoology
