Japanese Journal of Limnology最新文献_第10页

Lipid production of Botryococcus braunii in high-altitude dystrophic Lake Shirakoma, Japan 日本白马湖高海拔营养不良的布朗杆菌的脂质产生

Japanese Journal of Limnology Pub Date : 2014-01-01 DOI: 10.3739/RIKUSUI.75.161

Yasuhiro Suzaki, Noriko Futatsugi, Kotomi Watanabe, Kazuo Fukushima, Ho-Dong Park

{"title":"Lipid production of Botryococcus braunii in high-altitude dystrophic Lake Shirakoma, Japan","authors":"Yasuhiro Suzaki, Noriko Futatsugi, Kotomi Watanabe, Kazuo Fukushima, Ho-Dong Park","doi":"10.3739/RIKUSUI.75.161","DOIUrl":"https://doi.org/10.3739/RIKUSUI.75.161","url":null,"abstract":"The green algae Botryococcus braunii is known for its considerable production of hydrocarbons. Recently, we found B. braunii growing in Lake Shirakoma, which is situated at a high altitude ( 2 , 115 m ) in the Nagano Prefecture, Japan. We examined the nature of lipid production and the niche of B. braunii in the lake by conducting genetic, stable isotopic and lipid compositional analyses on natural and cultured algal strains. Using lipid and genetic analyses, B. braunii from Lake Shirakoma was identified as A race and phylogenetically close to B. braunii Yamanaka ( HM 245352 ) isolated from Lake Yamanaka in the Yamanashi Prefecture. Because both lakes are situated at high altitude and are usually or often covered by ice in winter, these species may have a similar ability to adapt to a cold climate. Lipids and stable isotopic compositions suggested that B. braunii is not consumed by zooplankton in Lake Shirakoma. Natural algal samples contained up to 0 . 045 % of hydrocarbons by weight. Meanwhile, the cultured strain produced up to 12 . 5 % of hydrocarbons by weight. Thus, B. braunii from Lake Shirakoma also has the potential to produce abundant hydrocarbons, when placed under optimum growing conditions.","PeriodicalId":35602,"journal":{"name":"Japanese Journal of Limnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69924602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitrogen and phosphorus bioaccumulations of Phragmites australis in Yatsu Tidal Flat 雅津滩涂芦苇氮磷生物积累

Japanese Journal of Limnology Pub Date : 2014-01-01 DOI: 10.3739/RIKUSUI.76.149

Y. Senga, Shohei Yamauchi

引用次数: 1

Comparison of measured and calculated loads using quadratic LQ equation for Hii River flows, eastern Shimane Prefecture, Japan 日本岛根县东部Hii河流量二次LQ方程实测与计算荷载的比较

Japanese Journal of Limnology Pub Date : 2014-01-01 DOI: 10.3739/RIKUSUI.75.151

T. Miyazako, Shogo Sugahara, Y. Tabayashi, H. Ohshiro, Y. Koyama, Y. Nakashima, H. Kamiya, Y. Seike

{"title":"Comparison of measured and calculated loads using quadratic LQ equation for Hii River flows, eastern Shimane Prefecture, Japan","authors":"T. Miyazako, Shogo Sugahara, Y. Tabayashi, H. Ohshiro, Y. Koyama, Y. Nakashima, H. Kamiya, Y. Seike","doi":"10.3739/RIKUSUI.75.151","DOIUrl":"https://doi.org/10.3739/RIKUSUI.75.151","url":null,"abstract":"We sampled river water from 1 July 2010 to 30 June 2011 in the Hii River. Suspended solids (SS), chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) showed increasing trends during floods. In contrast, dissolved silica (DSi) had a decreasing trend during floods. By comparing estimated loading amounts from a loading-flow (LQ) equation and actual loading amounts from multiplying a given day s chemical species and discharge, TN, nitrate and D-Si showed quantitative agreement between the two estimations. However, loading amounts of SS, COD, TOC, TP and phosphate from a linear LQ equation had lower values than those of actual loadings. The reason for such underestimation is an increased concentration of certain chemical species during flooding or high discharge. Therefore, we applied quadratic or cubic LQ equations. After applying the quadratic LQ equation to certain chemical species that showed low coefficients of determination, values improved. For more accurate loading amounts from an LQ equation, we require observation data from periods of high discharge.","PeriodicalId":35602,"journal":{"name":"Japanese Journal of Limnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69924540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

The mechanism and rate of re-sedimentation of phosphorus released from the sediment during the summer months in shallow brackish lakes 浅咸淡湖夏季沉积物中磷释放的再沉积机制和速率

Japanese Journal of Limnology Pub Date : 2014-01-01 DOI: 10.3739/RIKUSUI.76.139

H. Kamiya, Shogo Sugahara, Y. Saga, S. Sato, Y. Nojiri, M. Kishi, A. Fujihara, T. Godo

引用次数: 2

Describing benthic invertebrate communities in Japanese rivers using national environmental census data: spatial distributions of total biomass and major taxa 利用国家环境普查数据描述日本河流中的底栖无脊椎动物群落:总生物量和主要分类群的空间分布

Japanese Journal of Limnology Pub Date : 2013-09-20 DOI: 10.3739/RIKUSUI.74.129

Sohei Kobayashi, Fumikazu Akamatsu, S. Nakanishi, Yoshinori Yajima, Junji Miwa, Kunihiko Amano

{"title":"Describing benthic invertebrate communities in Japanese rivers using national environmental census data: spatial distributions of total biomass and major taxa","authors":"Sohei Kobayashi, Fumikazu Akamatsu, S. Nakanishi, Yoshinori Yajima, Junji Miwa, Kunihiko Amano","doi":"10.3739/RIKUSUI.74.129","DOIUrl":"https://doi.org/10.3739/RIKUSUI.74.129","url":null,"abstract":"Based on quantitative survey data of 108 rivers and 724 freshwater sites collected during a national census of river environments, we determined the frequency distribution of total invertebrate biomass (total biomass) of riffl es. We also examined the spatial pattern of total biomass by classifying sites according to channel gradient, bed substrate, and region. The median value of total biomass (in wet-weight) among all sites was 19.56 g m for spring-winter and 10.04 g m for summer-autumn. These values were similar to those previously reported for Japanese rivers, but were several times higher than those reported for rivers from other countries. The total biomass was lowest for sites with gentlest gradient classes (<1/3200) and larger for sites with steeper channel classes of up to 1/800-1/400. The total biomass was also lowest for sites with the fi nest substrate classes (silt, sand: <2 mm) and was larger for sites with coarser substrate classes up to small cobbles (5-10 cm). Total biomass was also larger for sites in southwestern regions (especially, Chugoku, Shikoku, Kyushu) than in northeastern regions (especially, Tohoku, Kanto, Hokuriku) with 2.7-6.6 fold differences in median values between these regions. Many taxa showed a high preference (i.e., disproportionately higher occurrence and abundance) for the slope and substrate classes with larger total biomass, and there was also a positive correlation between their own density and total biomass. These patterns were most conspicuous for net-spinning caddisfl y taxa, which are likely to contribute signifi cantly to the total biomass. According to habits of these taxa, bed characteristics such as amount of interstices and bed stability are likely to be factors controlling total biomass. A positive correlation between total biomass and number of genera","PeriodicalId":35602,"journal":{"name":"Japanese Journal of Limnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69923697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

紀伊半島に生息するテナガエビ属 (Macrobrachium) 3種のPCR-RFLP法を用いた同定手法の開発对生活在纪伊半岛的长虾属(Macrobrachium) 3种使用PCR-RFLP法的鉴定方法的开发

Japanese Journal of Limnology Pub Date : 2013-05-10 DOI: 10.3739/RIKUSUI.74.85

美鈴青木, 健児浜崎, 誠也山田

引用次数: 1

水田湛水層におけるCO2,溶存酸素(DO)，pHおよびRpHの日変動とその相互関係水田涝层中CO2，溶解氧(DO)， pH和RpH的日变动及其相互关系

Japanese Journal of Limnology Pub Date : 2013-01-21 DOI: 10.3739/RIKUSUI.74.15

靖浩臼井, 辰昭粕渕

引用次数: 4

Salinity range that freshwater submerged and floating-leaved plants which may overgrow in brackish lakes in Japan were observed 对日本咸淡湖泊中可能过度生长的淡水沉叶植物和浮叶植物的盐度范围进行了观察

Japanese Journal of Limnology Pub Date : 2013-01-01 DOI: 10.3739/RIKUSUI.75.113

M. Yamamuro

引用次数: 0

Spatial distribution of submerged macrophytes in the south basin of Lake Biwa in the summer of 2012, compared with 2002 and 2007. 2012年夏季琵琶湖南部盆地淹没植物空间分布与2002年和2007年的比较

Japanese Journal of Limnology Pub Date : 2013-01-01 DOI: 10.3739/rikusui.75.107

H. Haga, K. Ishikawa

{"title":"Spatial distribution of submerged macrophytes in the south basin of Lake Biwa in the summer of 2012, compared with 2002 and 2007.","authors":"H. Haga, K. Ishikawa","doi":"10.3739/rikusui.75.107","DOIUrl":"https://doi.org/10.3739/rikusui.75.107","url":null,"abstract":"The spatial distribution of submerged macrophytes, in terms of biomass and species composition, was surveyed in the south basin of Lake Biwa in September, 2012 using scuba. Submerged macrophytes were observed in 48 out of 52 sampling stations, and 12 species were found in this study. The number of species of submerged macrophytes per site was 4 . 6 ± 2 . 0 . The area with vegetation cover and the total biomass ( dry weight ) during the study period were estimated to be 47 . 6 km 2 and 3264 ± 1445 t, respectively. Although the area with vegetation cover was only 1 km 2 less than in 2007 , total biomass of submerged macrophytes declined by 6360 t during the same period. Biomass of Potamogeton maackianus , Egeria densa , and Ceratophyllum demersum decreased signifi cantly between 2007 and 2012 ( paired Student 2007 and 2012 ( paired Students t -test, P < 0 . 05 , n = 52 ) , 4107 t, 879 t, and 804 t, respectively. Biomass reduction in these three species accounted for 91 % of the entire reduction. The biomasses of the other species also declined, with excepthion of two, Potamogeton malaianus and P. anguillanus","PeriodicalId":35602,"journal":{"name":"Japanese Journal of Limnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3739/rikusui.75.107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69924050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

びわ湖の水温・濁度・クロロフィル・透明度の最近の変化傾向について关于琵琶湖的水温、浊度、叶绿素、透明度最近的变化趋势

Japanese Journal of Limnology Pub Date : 2013-01-01 DOI: 10.3739/rikusui.74.21

康昭奥村, 修一遠藤, 俊之石川

引用次数: 0