. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 360 BIOLOGY OF THE SEAS OF THE had a salinity similar to that of the present Caspian Sea. Their population, consisting of numerous species of Didacna, Adacna, Dreissensia, Neritina and Micromelania, was close to the present-day Caspian fauna. I. Gerasimov and K. Markov (1939) suppose that 'as a result of the loss of salinity of the Apsheron basin immigrants from the west, from the Black Sea (Kuyal'nik- Chauda) appeared in it. In the Baku basin era the flow of immigrants (from Chauda) had e
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 360 BIOLOGY OF THE SEAS OF THE had a salinity similar to that of the present Caspian Sea. Their population, consisting of numerous species of Didacna, Adacna, Dreissensia, Neritina and Micromelania, was close to the present-day Caspian fauna. I. Gerasimov and K. Markov (1939) suppose that 'as a result of the loss of salinity of the Apsheron basin immigrants from the west, from the Black Sea (Kuyal'nik- Chauda) appeared in it. In the Baku basin era the flow of immigrants (from Chauda) had evidently increased still further. Forms of the Pontic fauna. Fig. 177. Chaudinsk and Apsheron basins (Archangelsky and Kolesnikov). which had evolved in the Black Sea began to immigrate into the Caspian Sea.' The closed brackish Apsheron lake-sea obtained its fauna from three sources: (7) from Akchagyl (Clessinia, Apscheronia), (2) from some fresh- water source (Neritina, Melania, Melanopsis), and (3) in great quantity from the Euxine region of the Chauda basin, probably through its connection along the Manych depression (Dreissensia, Didacna, Monodacna). The modern Caspian fauna is the result of a further, but now independent, evolution of this fauna in the basin of the Caspian Sea. History of the Tertiary fauna of the Caspian Sea Reviewing the history of the Caspian Sea fauna during the Tertiary period, V. Bogachev (1932) lays stress on the numerous marked changes of fauna, which seem to break the genetic link of the fauna of one era with that of the subsequent one. He discerns such interruptions in the transition from the Sar- matian fauna to the Maeotic, from the latter to the Pontic, and from the Pontic to the Akchagyl. Bogachev explains these changes by assuming, in accordance with the views of E. Suess (1888), the existence of 'refuge' bodies of water (' caspians' as Suess called them) in which one or other fauna could survive. Please note that these images are extracted
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