. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 310 BIOLOGY OF THE SEAS OF THE 10 65-Ъ 60- 55 â 50 45 \ 40 35 30 25- 20- 15- 10 5 1 0 t~"?*<A. \ â ÐÑа \y. Byth Lma tentacutata Theo doius ftuwa h its 35 30 25 20 15 10 SALINITY Fig. 147. Changes in the length of the body of marine bivalves and fresh-water Gastro- poda with change in the salinity of the medium (Remane, 1934). Macoma reaches 21 to 24 mm in the areas west of Helsingfors, which are most favourable for its existence (as regards its feeding). For the rest, both Cardiu
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 310 BIOLOGY OF THE SEAS OF THE 10 65-Ъ 60- 55 â 50 45 \ 40 35 30 25- 20- 15- 10 5 1 0 t~"?*<A. \ â ÐÑа \y. Byth Lma tentacutata Theo doius ftuwa h its 35 30 25 20 15 10 SALINITY Fig. 147. Changes in the length of the body of marine bivalves and fresh-water Gastro- poda with change in the salinity of the medium (Remane, 1934). Macoma reaches 21 to 24 mm in the areas west of Helsingfors, which are most favourable for its existence (as regards its feeding). For the rest, both Cardium and Mytilus are larger in this area. Unlike Mytilus, Mya and Cardium men- tioned above, the size of Macoma is clearly only slightly affected by changes of salinity. Macoma baltica becomes smaller with the depth of its habitat {Table 127). According to H. Luther's data (1908) Macoma baltica from the inner bays of the Gulf of Finland is larger in size than the samples from the Littorina Sea deposits. At the same time, marine forms without a calcareous skeleton often do not undergo a decrease in size, as for example the amphipods Gammarus zad- dachi oceanicus and Corophium volutator, and the shrimp Leander adspersus fabricii, which are the same size in Danish waters as in the Gulf of Finland. Table 127 Depth, m Sedimentation Longest shell, mm 1-5 1-2-2-5 35-36 Gyttja Sand Gyttja 21-24 16 15. 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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