. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 372 kg/m2 90,000 BIOLOGY OF THE SEAS OF THE with 92,000 specimens, Pontogammarus maeoticus—1-38 kg/m2 with specimens, Hypaniainvalida—5,500 and 15-4 g/m2, Monodacna colorata —9,000 and 1-35 kg/m2, Corophium maeoticum—39,780 and 158-7 g/m2, and so on. It is most characteristic that in relation to salinity the autochthonous and Mediterranean forms are distinct from each other; this is clearly seen even in the case of the mysids (Fig. 178).. Penetration of the relict community into fresh wate
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 372 kg/m2 90,000 BIOLOGY OF THE SEAS OF THE with 92,000 specimens, Pontogammarus maeoticus—1-38 kg/m2 with specimens, Hypaniainvalida—5,500 and 15-4 g/m2, Monodacna colorata —9,000 and 1-35 kg/m2, Corophium maeoticum—39,780 and 158-7 g/m2, and so on. It is most characteristic that in relation to salinity the autochthonous and Mediterranean forms are distinct from each other; this is clearly seen even in the case of the mysids (Fig. 178).. Penetration of the relict community into fresh water The autochthonous relict community penetrated into fresh water during the phases of greatest loss of salinity and the subsequent increase of salin- ity. The migration into fresh water was easiest for the crustaceans and fishes and for some individual species of coelenterates, molluscs, bryozoans and polychaetes. Like the fresh waters of the Arctic basin those of the basins of our southern seas give shelter to an abundant relict fauna {Table 150). C\) Nh tQ °0 C3 C\j xj- CO OO ?? C\J 0°/ Fig. 178. Distribution of Black Sea my- sids according to salinity: / Relicts (endemic forms); and II Mediterranean forms (Bacesko). Fresh-water immigrants The low salinity of the bodies of water situated where the Black and Caspian Seas now lie opened them to immigrants from fresh water. In this case too, fish yield the greatest number of species, mainly the cyprinoid and Percidae families, and, to a lesser extent, next come the lower crustaceans, molluscs, oligochaetes and insect larvae (Chironomidae). The Arctic community The Arctic relict (or rather pseudo-relict) community which penetrated into the south-Russian bodies of water from the north in the post-glacial period, consisting mainly of crustaceans, is most original. It includes also some fish, seal and, possibly, the polychaete Manayunkia. The Arctic immigrants are very scarce in the Black Sea and are absent from the Aral S
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