巻号一覧
41 巻 (1980)
- 4 号 p. 185-
- 3 号 p. 117-
- 2 号 p. 57-
- 1 号 p. 1-
41 巻, 1 号
選択された号の論文の6件中1～6を表示しています
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本波 裕美, 半谷 高久1980 年 41 巻 1 号 p. 1-4
発行日: 1980/01/30
公開日: 2009/10/21
ジャーナル フリーLinear alkylbenzene sulfonates (LAS) in the surface sediment and the river water of the Tama River were determined by combined gas liquid chromatography and mass spectrometry. The composition of LAS homologues in the river sediment was remarkably different from that in the river water; the proportions of C12 and C13 LAS in the sediment were higher than those in the water, while those of C10 and C11 LAS were lower. The ratio of the concentration of the LAS homologues in the sediment to that in the water increased exponentially with increasing the carbon number of the alkyl group.抄録全体を表示PDF形式でダウンロード (449K) -
渡辺 真利代, 大石 真之1980 年 41 巻 1 号 p. 5-9
発行日: 1980/01/30
公開日: 2009/10/21
ジャーナル フリーLarge amounts of Microcystis aeruginosa were harvested from several lakes, ponds, reservoirs and moats in Tokyo and adjacent regions, and the toxicity of its water extract was examined by intraperitoneal injection in mice. Toxicity expressed as death of mice was found in the samples from five out of ten water bodies. The effects of temperature and proteases on toxicity of M. aeruginosa were also investigated in the samples from Lake Suwa. It was suggested that the toxin consisted of heat stable peptide or protein.抄録全体を表示PDF形式でダウンロード (600K) -
Binoy Krishna MANDAL1980 年 41 巻 1 号 p. 10-18
発行日: 1980/01/30
公開日: 2009/10/21
ジャーナル フリーSeasonal variation of the physicochemical factors and plankton community in a freshwater fish pond at Burdwan, West Bengal were studied from January to December, 1971. Water temperature varied from 20.0°C in January to 32.6°C in June. Total plankton volume varied from 8.7 to 14.2 ml and the maxima were recorded in February (spring) and July (monsoon) and the minima appeared in April (summer) and November (autumn). It was observed that the spring maximum was dominated by zooplankton while the monsoon maximum was dominated by phytoplankton. The rotifers constituted the most abundant group of zooplankton. Water-blooms of blue-green algae were recorded from the monsoon period to autumn. A positive correlation between the phosphate content of the water and the zooplankton was observed.抄録全体を表示PDF形式でダウンロード (1111K) -
(4) 夏期の対馬佐須川と瀬川について石崎 修造, 町田 吉彦1980 年 41 巻 1 号 p. 19-23
発行日: 1980/01/30
公開日: 2009/10/21
ジャーナル フリーThe benthic communities of the River Sasu and the River Se were investigated in July 1975. The prevalent faunae in summer were Ephemeroptera in the River Sasu and Chironomidae in the River Se. In winter, Chironomidae were dominant in the River Sasu and Ephemeroptera in the River Se. At St. 9 and 10 of the River Sasu in winter, the faunae were largely affected by the discharge from a Zinc Mine. In summer, both the numbers of individuals and species were greater than those in winter at these stations. But even in summer at the same stations, few species were recognized compared to the number found at others. At St. 10 and 11 of the River Sasu in summer, the heavy metals content in water increased progressively but faunae were complex too. This may have been caused by successive decrease of the heavy metals in the mud at such stations. The fauna was rich at all stations of the River Se. However, the community structure of the benthos seems to be unstable throughout the year because the dominant species changed between winter and summer at all the stations.抄録全体を表示PDF形式でダウンロード (604K) -
1.河床型, 地域および季節間の比較牧 岩男1980 年 41 巻 1 号 p. 24-40
発行日: 1980/01/30
公開日: 2009/10/21
ジャーナル フリーMacro-benthos communities in the middle and downstream of the River Hikigawa are compared statistically in terms of riverbed types, sampling sites and seasons. More than 90 species of animals inhabit this area, and most of them are aquatic insects. Although the number of taxa, total individual numbers and total biomass tend to be abundant at the Hayase rapids in the middle stream in summer and autumn, their differences in each type of riverbed are hardly detectable downstream and in all sites in winter and early spring. Comparisons of these three measurements among sampling sites reveal significant differences in all riverbed types and seasons. But no correlation is found between these measurements and the horizontal gradient of the riverbed in this area. They also change with the season in most riverbed types and sites. In the main stream, the variance ratios differ significantly at one percent probability levels in all sites, and the maximum amounts are attained between winter and early spring. Simpson's species diversity index does not show any seasonal periodicity when it is compared on the above three bases, although differences between them in terms of sites and seasons are often observed. This result may be mainly caused by the significant positive correlations between the number of taxa and total individual numbers.抄録全体を表示PDF形式でダウンロード (1988K) -
佐竹 研一1980 年 41 巻 1 号 p. 41-50
発行日: 1980/01/30
公開日: 2009/10/21
ジャーナル フリーMany volcanic acid lakes having pH from 0.9 to 5.5 are distributed throughout Japan. Most of the lakes with pH less than 4.0 are found in craters of volcanos, and their acidity depends on an inflow of acidic water from the lake bottom. Many of the remaining lakes are located in caldelas or hare a volcanic dammed origin, and their acidity depends on an inflow of acidic river water.
Studies on inorganic acid lakes in Japan were initiated by Tanaka, who observed Lake Katanuma in 1915 and Lake Onumaike from 1920 to 1927. Next came the limnological works on the Goshikinuma lake group (pH 3.1-7.2) and Lake Katanuma by YOSHIMURA et al. The typology of acid lakes was discussed by UENO who observed the lakes located at North Shinano, South Kyushu and the Kuril islands. The biota in acid lakes were studied by NEGORO, KIKUCHI, KOKUBO, FUJIMATSU, TAMURA and MASIKO et al.
They researchers reported Pinnularia braunii var. amphicephala in Lake Katanuma (pH 1.4 at that time), Brachionus urceoralis in Lake Ichibishinaiko (pH 2.8), Leptodictyum sp. and fish in Lake Osoresanko (pH 3.4), as will as the other algae, zooplankton and insects in the acid lakes. Anzai investigated the change of pH with the cease of volcanic activity, and he found that the deposition of iron compounds was followed by the occurrence of Pinnularia braunii var. amphicephala.
Acidification of lake water under the inflow of the acid river Tamagawa (pH 4.3) was studied by YOSHIMURA and UENO on Lake Tazawako.
After world War II was over study was resumed by MINAMI et al., who reported the chemical compositions of Lake Yugama which contains about 0.2 N sulfuric acid. Observation of biota in acid lakes was commenced by Suzuki who reported the mold and bacteria in acid lakes. Phytoplankton and zooplankton were observed by MIZUNo on the lake Group located in Kirishima volcano (pH 3.7-7.5), and WATANABE and OYAGI observed benthic diatoms in Lake Fudoike. Macrophytes and fish were observed by YAMAMOTO et al., in Lake Osoresanko. In Lake Katanuma SATAKE and SAIJO measured total CO2 and CO2 uptake in oxic and anoxic water, and they also clarified the mechanism of sulfurdiatom lamination in the sediment.
Sato observed the change of biota caused by the acidification of Lake Tazawako. EGUCHI et al., observed the inflow of acid river and the change of biota in Lake Toyako.抄録全体を表示PDF形式でダウンロード (1492K)
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