. Bio-ecology. Plant ecology; Animal ecology; Botany; Ecology; Zoology. 210 MIGRATION ogists are primarily naturalists, and experiments awaited the growing interest of physiologists and ecologists in the problem, which in turn was an outcome of the extraordinary advances in the field of vitamins and hormones. Nevertheless, though observation will always have its peculiar values, it should henceforth be more fully informed through experiment and be content to recognize that conclusive and objective results are the province of the latter (Baldwin and Kendeigh, 1932). The literature of migration
. Bio-ecology. Plant ecology; Animal ecology; Botany; Ecology; Zoology. 210 MIGRATION ogists are primarily naturalists, and experiments awaited the growing interest of physiologists and ecologists in the problem, which in turn was an outcome of the extraordinary advances in the field of vitamins and hormones. Nevertheless, though observation will always have its peculiar values, it should henceforth be more fully informed through experiment and be content to recognize that conclusive and objective results are the province of the latter (Baldwin and Kendeigh, 1932). The literature of migration is too extensive to be read by anyone other than the specialist, but a knowledge of its general content is. Fig. 51.—^Distribution and migration of the scarlet tanager. During the breed- ing season indi\iclual scarlet tanagers may be 1,900 miles apart in an east-and- west line across the breeding range. In migration, however, the lines converge until in southern Central America they are not more than 100 miles apart. (After Lincoln, 1935.) essential to securing an adequate historical background and the proper perspective for the future of experimentation. For this, the sources are time-consuming, and it is preferable to turn to compendia and summaries for the most part. These are well exemplified by the following: Cooke, 1885, 1910, 1913; Gatke, 1895; Dixon, 1895; Whitlock, 1897; Taverner, 1904; Walter, 1908; Hcnshaw, 1910, 1921; Clarke, 1912; Coward, 1912; Cathelin, 1920; Lucanus, 1922; Thom- son, 1926, 1936; Wetmore, 1926; Grinnell, 1931; Heape, 1931; Rowan, 1931, 1932; Chapman, 1932; Lincoln, 1935. \ The divergent views concerning migration have centered about three major questions, namely, the origin of the behavior, the factors. 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. (Fr
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Keywords: ., bookcentury1900, booksubje, booksubjectbotany, booksubjectzoology
