The Physiological Property of Sea Water Considered from the Effect upon the Growth of Diatom, with Special Reference to its Vertical and Seasonal Change
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In order to study the physiological property of the sea-water, especially its effect on the the growth of diatoms, the present experiment was carried out. Sea-water samples were collected at different depths and on different dates off Sinmaiko, west coast of Tita Peninsula. The sample were enriched with nitrate, phosphate, silicate and iron, and used for culture media of diatoms, artificial light being employed for the illumination. Media prepared with different sea-water samples gave different effect upon the growth of diatoms as shown in Tables 1 and 2, and Fig. 1. The growth of diatoms in media of both the surface and the bottom water was better than in that of the water taken from middle layer (Table. I). The media prepared with water samples taken on different dates at the same place show different grades of effect upon the growth. As the sea-water moves in the sea the water at a certain place changes its property occasionally and it becomes sometimes coastal and others oceanic in its nature. Culture media prepared with coastal water gave better growth than those with oceanic water collected thus at the same place but on different dates (Table 2, Fig. 1). The miqueld sea-water enhances the growth of diatoms in the present experiment as in the case of ALLEN and NELSON (1910), yet the culture with the miquelded sea-water show similarly as in the non-miqueled that the sea-water at different vertical layers has different effect upon the growth of diatoms (Table. 1). This points to the conclusion that the sea-water contains some substance which enhances the growth of diatoms. As both the coastal and the bottom sea-water are alike rich in the organic matter, this substance may enhance the growth of diatoms in the culture media.
- 社団法人 日本水産学会の論文