On the Quantitative Ecology of the Marine Population in the Boundary Zone-II:Quantitative distribution of plankton population
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概要
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If there are the data on the distribution of temperature, salinity, dissolved oxygen and phos phate in a given region, it is possible to estimate the standing crop of plankton population from the oxygen supersaturation by using the method described in the preceding paper. Unfortunately, however, we have little such complete data on the oxygen distribution covering different seasons and places for the practical calculation of the standing crop in the sea area surrounding the Japan. Therefore, in this paper, a statistical method is developed for the evaluation of the oxygen supersaturation. The method has been based on the relationship between the oxygen supersaturation and the water temperature, and their statistical treatments have been made by using the data described in a series of publications of the Central Meteorological Observatory and the Imperial Fisheries Experimental Station in Japan respectively on temperature, salinity and oxygen distributions in the eastern sea of Japan (see references). The frequency distribution of the oxygen supersaturation against the different grades of water temperature in the eastern sea of Japan is given in Table 1. The values of the oxygen supersaturation in each water temperature are averaged respectively and plotted into Fig. 1 in the range of water temperatures from 11°C to 25°C together with the actual determinations for micro-plankton organisms obtained by T. SHIMOMURA, 1953. As shown in Fig. 1, the maximum oxygen supersaturation which should be corresponded to the maximum standing crop of the plankton is found in the range of temperature from 14°C to 17°C and fairly agrees with the actual maximum amounts of mieroplankton organisms. However, the actual determination shows the another mode of plankton population at the range of temperature from 8°C to 9°C. For the lower range of temperature than 11°C in this area, the available data on the oxygen distribution have been very scant, so that the data on the Japan Sea have been refered, even if they might be unadequate (Fig. 2). According to Fig. 2, the mode of the oxygen supersaturation is found at the range of temperature between 4°C and 9°C. Therefore, from these facts it is assumed that there would exist a fertile zone also in colder sea areas than 11°C.
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