. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 736 BIOLOGY OF THE SEAS OF THE of the same genera. Of course there are many examples among deep-water fauna of a wide vertical and horizontal distribution of individual species, but a relatively restricted area of habitat is characteristic of all the deep-water fauna. This is most evident from N. Vinogradova's examination of the distribution of many forms of deep-water benthos (1955-58). The invariable increase of endemic forms with depth is shown by this comparison both of the three.
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 736 BIOLOGY OF THE SEAS OF THE of the same genera. Of course there are many examples among deep-water fauna of a wide vertical and horizontal distribution of individual species, but a relatively restricted area of habitat is characteristic of all the deep-water fauna. This is most evident from N. Vinogradova's examination of the distribution of many forms of deep-water benthos (1955-58). The invariable increase of endemic forms with depth is shown by this comparison both of the three. >zooo >3D00 >WD Fig. 360. Extent of taxonomic isolation of deep-water bottom- living fauna of western and eastern parts of the Pacific Ocean at different depths (Vino- gradova, 1955). Oceans and of some individual parts of them. This is well illustrated by the Figs. 360 and 361. The deep-water fauna of the eastern and western parts of the Pacific Ocean has in the surface zone (4,000 m) less than 10 per cent of them. The same phenomenon was observed from comparison between the northern and southern parts of the oceans and between the oceans themselves. Further research on the deep-water fauna will no doubt weaken the conception of its endemic nature, but will hardly destroy it. The idea of the uniformity and geographical homogeneity of the deep-water fauna was based on the con- ception of the uniformity, constancy and slight changeability of the conditions of its existence (t°, S%0, oxygen), and on the absence of any restriction on its. 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 Zenkevich, L. A. (Lev Aleksandrovich), 1889-1970. New York, Interscience Publishers
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