. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. Fig. 164. Distribution of Myoxocephalus quadricomis (A) in the Sea and the lakes (B) of* Sweden (Ekman). Several such forms are found in the southeastern part of the North Sea. The Baltic Sea, stretching far from south to north, and with a very severe climate in the north, provides a most favourable environment for the pre- servation of cold-water relicts. It is possible that low temperature, rather than salinity, promotes the existence of Arctic brackish-water relicts in the northern part of the B
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. Fig. 164. Distribution of Myoxocephalus quadricomis (A) in the Sea and the lakes (B) of* Sweden (Ekman). Several such forms are found in the southeastern part of the North Sea. The Baltic Sea, stretching far from south to north, and with a very severe climate in the north, provides a most favourable environment for the pre- servation of cold-water relicts. It is possible that low temperature, rather than salinity, promotes the existence of Arctic brackish-water relicts in the northern part of the Baltic. The same can be seen in the case of polychaetes. It follows from the zoo- geographical analysis of this group given by A. Friedrich (1938) that, whereas for the North Sea and the Baltic together the boreal, Lusitanean and Lusi- tanean-boreal species form 53-2 per cent, and the Arctic, Arctic-boreal and. Fig. 165. Distribution of Mysis oculata in the Sea (A) and M. o. relicta in the lakes of Sweden (B) (Ekman).. 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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