著者

佐藤 直 徳弘 航季 松野 孝平

出版者

日本プランクトン学会

雑誌

日本プランクトン学会報 (ISSN:03878961)

巻号頁・発行日

vol.69, no.1, pp.11-17, 2022-02-25 (Released:2022-03-06)

参考文献数

45

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Limacina helicina, a species of Pteropoda (Cuvier, 1804), plays an important role in the food web and carbon cycle in subpolar and polar regions. The presence of aragonite unsaturated water in the Pacific sector of the Arctic Ocean necessitates the need to examine damage caused by ocean acidification on species with aragonite shells. According to previous studies that examined the impact of acidification on shell-bearing species by employing incubation experiments, young stages (veligers and juveniles) are more vulnerable than adults. In the present study, vertical distribution of the young stages of L. helicina in the Arctic Ocean during autumn was observed to evaluate the effects of environmental factors on their distribution. Veligers and juveniles showed high abundances from the surface to 30 m depth in the basin regions around the Chukchi Plateau (Stations 39, 45, and 49) but were restricted to a depth of 20–30 m, overlying a strong halocline formed by the inflow of less saline water. Veligers were predominant in the basin regions, indicating that active reproduction occurred in September. Since adult females involved in reproduction were abundant in the shelf regions, their reproduction patterns varied with different periods and regions. Unsaturated aragonite waters and damaged shells were not observed in the study area, possibly due to dilution by sea ice melt water inflowing from the shelf regions. This study showed that the distribution of the young stages of L. helicina was predominantly concentrated in the upper 30 m of the basin due to stratification with a strong halocline in the shallow layers caused by the inflow of sea ice melt water.

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.