巻号一覧
42 巻 (1981)
- 4 号 p. 189-
- 3 号 p. 123-
- 2 号 p. 65-
- 1 号 p. 1-
42 巻, 4 号
選択された号の論文の8件中1～8を表示しています
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古武家 善成1981 年 42 巻 4 号 p. 189-200
発行日: 1981/10/30
公開日: 2009/10/21
ジャーナル フリーThe distribution of anionic surfactants determined as MBAS in the river and sea waters of Hyogo Pref. was investigated by the methylene blue routine method corrected for the interference of photosynthetic pigments of phytoplankton.
MBAS concentration in the river waters was higher in the coastal areas of Osaka Bay and Harima Nada where the population and the industry were centralized, and concentrations greater than 1 mg·l-1 were observed, especially in smaller rivers. In the sea waters of Osaka Bay and Harima Nada, the high concentration of MBAS was found near the northern coasts where a high concentration of MBAS was observed in the river waters. These facts suggest that the anionic surfactant pollution of the river and sea waters is due largely to the domestic and industrial effluents, The annual loadings of anionic surfactant as MBAS were estimated by statistical data to be about 11, 000 tons per year, 37% from the industry and the rest from domestic waste.
Moreover, because of the good correlations between MBAS and various forms of phosphorus it is presumed that detergents including condensed phosphates as a builder may cause the increase in phosphorus concentration in the river waters.抄録全体を表示PDF形式でダウンロード (1864K) -
西野 麻知子1981 年 42 巻 4 号 p. 201-219
発行日: 1981/10/30
公開日: 2009/10/21
ジャーナル フリーThe concept of'brood habit'recently proposed has been introduced in the examination of two subspecies of Paratya compressa. The pattern of brood habit within a population in compressa shows that egg size, relative brood size (RBS) and relative brood weight (RBW) remain almost similar regardless of body size, whereas in a population of improvisa egg size and RBW slightly increase with body size and RBS remains constant.The remarkable feature in brood habit among populations of the subspecies compressa is the presence of two distinct population groups that exhibit a varying series separately for mean egg size, mean RBS and mean brood size in relation to mean female body size, and the subspecies improvisa is included at the remote end of one series. The validity of these subspecies is doubted, by taking into account their distributional and morphological features as well, and two forms, improvisa-compressa complex (large-egg form) and the part of compressa (small-egg form) are shown recognizable. A geographical trend is noticeable in the variation of brood habit for each form, that can be considered as related to the adaptive strategy of increasing egg and body size near the border of species distribution range.抄録全体を表示PDF形式でダウンロード (2187K) -
松永 捷司1981 年 42 巻 4 号 p. 220-229
発行日: 1981/10/30
公開日: 2010/02/12
ジャーナル フリーChanges in the concentrations of inorganic nutrients, dissolved oxygen and phytaplanktonic organic materials were determined during the course of decompositive processes of phytoplankton in vitro in order to clarify the recycling of organic matter elements in natural waters.
Phytoplanktonic organic materials were degraded biologically with consumption of oxygen, production of carbon dioxide and regeneration of inorganic nutrients. The atomic ratio of these elements was estimated, although an initial lag-phase was observed for the change in concentrations of ammonium nitrogen as well as phosphate phosphorus.
The kinetic considerations indicated that the mechanism of the decomposition of phytoplanktonic organic materials depended on the quality of organic constituents used as a substrate for the biological utilization. The decompositive process consisted of two reaction steps, a rapid step during the first two weeks and a slow one occurring thereafter. Each of the reactions was a first-order reaction as reported by several workers. The reaction rate constants of each of the organic constituents were determined in both steps.抄録全体を表示PDF形式でダウンロード (1250K) -
小川 吉夫, 市村 俊英1981 年 42 巻 4 号 p. 230-237
発行日: 1981/10/30
公開日: 2009/10/21
ジャーナル フリーIn situ growth and photosynthetic characteristics of Oscillatoria mougeotii were studied in the metalimnetic layer of a small eutrophic lake. Population growth of O.maugeotii showed a logistic curve and the mean increase rate of population was 0.086 (day-1). Photosynthesis of individual species in the natural phytoplankton community was measured by grain density autoradiography. The photosynthetic nature of O.mougeotii represented by the light-photosynthesis curve was a shade type with a steeper initial slope and a low maximum photosynthetic rate.The growth curve of O. mougeotii estimated by a model using the light-photosynthesis curve and light conditions coincided fairly well with the observed curve. Thus it was concluded that the population development of O. mougeotii in the metalimnion would be mainly due to the in situ photosynthetic growth.抄録全体を表示PDF形式でダウンロード (1241K) -
窪田 英夫1981 年 42 巻 4 号 p. 238-245
発行日: 1981/10/30
公開日: 2009/10/21
ジャーナル フリーFossil diatoms found in seven boring care samples from the bottom of Lake Suwa were investigated. In these samples, 25 genera, 61 species and 22 varieties, including unidentified 3 taxa were found. The composition of the species in samples 1 to 7 and sample 8 of surface mud was almost the same, and Melosira granulata, Melosira japonica, Cyclotella comta, and Fragilaria construens appeared to be dominant. The frequency of Melosira granulata in the current deposit was found to be notably decreasing compared to that in the old deposits. However, whether or not this was caused by the progress of pollution must be studied in detail in the future.抄録全体を表示PDF形式でダウンロード (1970K) -
姫野 文雄, 大槻 晃, 高橋 正征, 白石 寛明1981 年 42 巻 4 号 p. 246-249
発行日: 1981/10/30
公開日: 2009/10/21
ジャーナル フリーThe reverse osmosis for concentration of dissolved organic matter in lake water has been examined.Recovery of dissolved organic matter as organic carbon was determined using glucose, saccharose, glycine, glycyl glycylglycine, sodium acetate, and disodium EDTA. The results suggested that dissolved organic matter having a molecular weight of more than 200 may be effectively concentrated with recovery of more than 90% when about 10-liter samples are reduced to one-fifth at 6kg/cm2 for 40 to 54 minutes.
When 20 to 50l of lake water samples, which were taken in Lake Kasumigaura during spring to summer and passed through a Whatman GF/C glass fiber filter, were reduced to 1.5to 2 l, 63 to 93% of the dissolved organic matter were recovered as organic carbon.抄録全体を表示PDF形式でダウンロード (530K) -
加藤 憲二, 坂本 充1981 年 42 巻 4 号 p. 250-253
発行日: 1981/10/30
公開日: 2009/10/21
ジャーナル フリーA pattern of diurnal change in microbial 14C-glucose uptake (net assimilation+mineralization) was observed in the epilimnion in Lake Kizaki, a typical mesotrophic lake. The highest uptake rate was found in the morning or noon and the rate decreased toward evening. During the nocturnal period the glucose uptake increased with time, and most of this increase was due to net assimilation.抄録全体を表示PDF形式でダウンロード (479K) -
佐藤 泰哲, 半谷 高久1981 年 42 巻 4 号 p. 254-258
発行日: 1981/10/30
公開日: 2009/10/21
ジャーナル フリーUrea in waters collected from a central water column of Lake Yunoko was determined from July of 1971 to April of 1972. The annual minimum of the urea standing stack in the central water column was 3.75 mg-at-N·m-2 in November of 1971. The annual maximum was 61.0mg-at-N·m-2 in ice-covered March of 1972. Three depth profiles of urea out of six appeared to be nutrient types with depression of urea in the traphogenic layer, but increase in the tropholytic layer. In these cases, photosynthetic activities might regulate the urea depth profile. The ratios of urea-N/TIN (total inorganic nitrogen) suggest that urea was a major constituent of nitrogenous nutrients in ice-covered March, but a minor component throughout the rest of the year. Allochthonous urea, which originated from waste water treatment, seems to have been an important source of urea in water of Lake Yunoko.抄録全体を表示PDF形式でダウンロード (728K)
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