札幌暮らしが初めてのあなたへ

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このところ、札幌の路面は凍結し、滑りやすくなっています。こうした冬の初めは、転倒しないよう心がけながら歩行しなければなりません。

 

しかしながら、どうしたら転倒しないよう、凍結路面を歩行するか？　

 

そのコツを紹介しているサイトを発見！　その名もズバリ、「転ばないコツを教えます。」。

掲載されている情報を参考にしながら、快適な冬の札幌を満喫して下さい。

人生、山あり山あり

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この９月に博士の学位を取得した藤井正典さん（現在・東京大学農学特定支援員）の論文がMicrobial Ecology誌にオンラインで公開されました。

 

高山や亜高山帯の湖沼生態系は気候変動の影響を受けやすいと考えられています。湖水中の微生物群集がどのような環境変化に対して敏感に反応しているのか、東日本の８地域の高山・亜高山帯に出向いて、様々な特徴のある４１の湖沼を調査研究した力作です。

 

私たちが取り組んでいる研究の中でも、最もガテン系と言っても良いかもしれません。当研究室では、比較的オシャレなラボ系の研究も行っており、大学院生の興味や関心を尊重しながら研究テーマを選んでおります。

 

この研究も、野外調査はガテン系ですが、研究室に戻ってからは、DNA情報から微生物群集を解析し、その膨大なデータの統計解析を行う、オシャレ（？）な研究でもあります。

 

まあ、艱難辛苦の末の論文です。人生、山あり、山あり。藤井さんの研究人生に幸あれ。

 

Masanori Fujii, Hisaya Kojima, Tomoya Iwata, Jotaro Urabe and Manabu Fukui.

Dissolved organic carbon as major environmental factor affecting bacteriplankton communities in mountain lakes of eastern Japan.

Microbial Ecology. In press

 

<Abstract>

Relationships between environmental factors and bacterial communities were investigated in 41 freshwater lakes located in mountainous regions of eastern Japan. Bacterioplankton community composition (BCC) was determined by polymerase chain reaction-denaturing gradient gel electrophoresis of the 16S rRNA gene and then evaluated on the basis of physicochemical and biological variables of the lakes. Canonical correspondence analysis revealed that BCC of oligotrophic lakes was significantly influenced by dissolved organic carbon (DOC) content, but its effect was not apparent in the analysis covering all lakes including mesotrophic and eutrophic ones. The generalized linear model showed the negative association of DOC on the taxon richness of bacterioplankton communities. DOC was positively correlated with the catchment area per lake volume, suggesting that a large fraction of DOC supplied to the lake was derived from terrestrial sources. These results suggest that allochthonous DOC has a significant effect on bacterioplankton communities especially in oligotrophic lakes. The genus Polynucleobacter was detected most frequently. The occurrence of Polynucleobacter species was positively associated with DOC and negatively associated with total phosphorus (TP) levels. In addition, TP had a stronger effect than DOC, suggesting that oligotrophy is the most important factor on the occurrence of this genus.