著者

小林 淳希 宮下 洋平 大洞 裕貴 織田 さやか 田中 邦明 松野 孝平 山口 篤 今井 一郎

出版者

Faculty of Fisheries Sciences, Hokkaido University

雑誌

Memoirs of the Faculty of Fisheries Sciences, Hokkaido University (ISSN:24353361)

巻号頁・発行日

vol.60, pp.33-67, 2021-12

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Onuma and Konuma are belonging to the Onuma Quasi-National Park and are located in southern Hokkaido. The fisheries and tourism are important industries in this lake area. Eutrophication has progressed in these lakes since the 1980s, and nuisance blooms of cyanobacteria have occurred every summer to autumn. The outbreaks of cyanobacterial blooms substantially destroy the ecosystem due to the production of cyanobacterial toxins, and effective countermeasures are urgently needed. However, in the lakes of Oshima Onuma, there is a paucity of knowledge about the appearance trends of phytoplankton including cyanobacteria. Therefore, seasonal monitorings were carried out on the phytoplankton community in the water column and the relatioships were discussed between dynamics of phytoplankton communities and changes in environmental factors in the lakes of Oshima Onuma. The survey was conducted once a month as a rule at Stns. 1-5 (Stn. 1 is the northeastern end of Onuma, only Stn. 5 is in Konuma) and at Stn. OP and Stn. OC along the shore of the Lake Onuma during the period of May-November 2015 and April- October 2016. The parameters of hydraulic environments were measured about water temperature, pH, transparency, dissolved oxygen, nutrient concentrations (NO3-N, NO2-N, NH4-N, PO4-P, SiO2-Si), chlorophyll a concentration, and pheophytin. The chlorophyll a concentration of the surface water showed a single-peak type fluctuation with the maximum value (28.7 μg L-1 at Stn. 2) in August at all stations in 2015. In 2016, the largest single-peak type fluctuation was observed in September- October with the exception of Stn. 3. Concerning the seasonal variation of the phytoplankton species, the proportion of Uroglena volvox (Chrysophyceae) was high at Stn. 5 in May, but the pennate diatoms Fragilaria crotonensis and Asterionella formosa, and the centric diatoms Aulacoseira spp. at other stations other than Stn. 5. As for cyanobacteria in August 2015, Dolichospermum planctonicum, possessing an ability of nitrogen-fixation, dominated (maximum 4.4×104 cells mL-1) at all the stations under the severe nitrogen-deficient conditions (N/P < 16). In the following year 2016, the cell densities of Dolichospermum spp. were low, and Microcystis spp. dominated at all the stations (up to 5.6×104 cells mL-1) with the enough nitrogen conditions. It is hence thought that the N / P ratio determined the dominant species of cyanobacteria in the summer season. In September and thereafter, the number of phytoplankton cells decreased on the whole in both years, and the centric diatoms Aulacoseira spp., Cyclotella spp. and the cryptophyte Cryptmonas spp. tended to increase. Considering the occurrence mechanisms of cyanobacterial blooms based on the fluctuation trends of cyanobacteria in the water columns, it is found that the supply of Microcystis aeruginosa from the lake bottom sediment to the water column (water temperature of 10-15ºC is required) is progressing at all stations in April-June. Since Onuma and Konuma are shallow with an average depth of 4.7 m, wind-inducing resuspension of bottom sediments probably contribute to the supply of cyanobacteria to water columns. In addition, since cyanobacterial cells tend to float and accumulate in surface water, it is needed to take physical factors such as wind and flow into consideration regarding the distribution of the blooms of cyanobacteria.

著者

石崎 廣 五十嵐 弘道 荒井 頼子 蒲地 政文 石川 洋一 齊藤 誠一

出版者

Faculty of Fisheries Sciences, Hokkaido University

雑誌

Memoirs of the Faculty of Fisheries Sciences, Hokkaido University (ISSN:24353361)

巻号頁・発行日

vol.60, pp.1-31, 2021-12

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When a histogram-based method for front detection was applied to the sea surface temperature (SST) and chlorophyll-a (CHL) data by ‘Himawari’ and ‘Shikisai’ (GCOM-C) satellite, the obtained frontal patterns were scale-selective, corresponding to the window scales (W). On this basis, the optimum initial smoothing condition as the data preprocessing was searched for, that maximizes the frontal edge point detection rate to the given W. As the smoothing filter, the median filter (MF) and the Gaussian filter (GF) were used solely or co-used. As the result, it was found that the frontal edge point detection rate was maximized when the original data were smoothed until the scale of about a half of W, that is, when the disturbances with the scales less than about a half of W were removed, for the low-latitude SST data of ‘Himawari’ with the co-use of MF and GF. Namely, the optimum smoothing scale (D) that maximizes the frontal edge point detection rate is roughly proportional to W. The mean values (Rm) of the ratio of D to W (R=D/W), averaged over the practical range of W for various data and regions, fall in a range 0.3 < Rm < 0.5.

著者

山口 篤

出版者

Faculty of Fisheries Sciences, Hokkaido University

雑誌

Memoirs of the Faculty of Fisheries Sciences, Hokkaido University (ISSN:21861927)

巻号頁・発行日

vol.53, no.2, pp.13-18, 2011-06

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Recent advances in studies on zooplankton ecology in the Oyashio region were reviewed. In this review, the following three topics were argued : i) ecosystem structure in the region, ii) inter-annual changes in zooplankton biomass and iii) optical analysis on zooplankton samples. Annual mean biomass in the Oyashio region was estimated to be 23 g C m-2 and was dominated by mesozooplankton (34%), followed by phytoplankton (28%), heterotrophic bacteria (15%) and microzooplankton (14%). Within the mesozooplankton, large grazing copepods (i.e. Neocalanus spp., Eucalanus bungii and Metridia spp.) were the most important taxa to govern the seasonal and inter-annual variability. Through the analysis on zooplankton samples collected during 1950’s to present, inter-annual variability in mesozooplankton biomass was revealed to be related with the Pacific Decadal Oscillation (PDO) and climate regime shift. While the zooplankton size is important to determine the food quality for pelagic fishes and the mass flux to the deep ocean, detailed analysis on their size distribution is not made for most of the samples, because of the difficult and time consuming analysis involved. The recently advanced optical plankton counter (OPC) can measure the particle (=plankton) with detailed size distribution (4096 size unit between 0.25 mm and 20 mm) within a short period, therefore the application of OPC on zooplankton samples may solve the problem in future.

著者

Tatsuta Naoki Imamura Hisashi Nakaya Kazuhiro Kawai Toshio Abe Takuzou Sakaoka Keiichiro Takagi Shogo Yabe Mamoru

雑誌

Memoirs of the Faculty of Fisheries Sciences, Hokkaido University (ISSN:21861927)

巻号頁・発行日

vol.56, no.1, pp.1-64, 2014-05

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A taxonomic examination of 3,108 specimens of mesopelagic fishes, collected around the Ogasawara Islands in December 2010 by a beam trawl net operated from the T/S Oshoro-maru, Hokkaido University, Japan, resulted in the recognition of 99 species representing 34 families and 65 genera. Descriptions are provided for all species, two of them〔 a stomiid Eustomias braueri Zugmayer, 1911 and linophrynid Haplophryne mollis (Brauer, 1902)〕 being new records for Japan. Three species, a stomiid Eustomias sp., trachipterid Desmodema sp. and oneirodid Oneirodes sp., could not be identified at the species level