㛛 㛛ụ ụほ ほᐹ ᐹ ࡉࡉ ࡓࡓỈ Ỉ୰ ୰ ࡢࡢᚤ ᚤᑠ ᑠ⏕ ⏕≀ ≀㸦 㸦㹼 㹼ᖺ ᖺ ࡢࡢㄪ ㄪᰝ ᰝ㸧 㸧 ⰾ㔝ᜤኈ *1 㕥ᮌ ⊛ *2 బࠎᮌᩗᏊ *2 ᮡᮏ㢼Ꮚ *2 ➉அ *1 A Aq qu ua at ti ic c M Mi ic cr ro o- -o or rg ga an ni is sm ms s O Ob bs se er rv ve ed d a at t K Ka ad do o- -i ik ke e P Po on nd d㸦 㸦R Re es se ea ar rc ch h o of f 2 20 00 06 6- -2 20 01 19 9㸧 㸧 YOSHINO Kyoji *1 , SUZUKI Takeshi *2 , SASAKI Keiko *2 , SUGIMOTO Fuko *2 , TAKEGUCHI Masayuki *1 Abstract: In this study, we reported aquatic micro-organisms observed at Kado-ike pond, an irrigation pond in Numazu City, Shizuoka, in summer of 2006-2019. Kado-ike pond is an eutrophic pond and blue-green algae are blooming. In observation with microscope, 12 genera of unicellular prokaryotes, 70 genera of unicellular eukaryotes including 22 genera of protozoans, 18 genera of multicellular eukaryotes (metazoans), and 1 genus of a higher plant were found. Some micro-organisms of Cyanophyceae, Bacillariophyceae, Chlorophyceae, Oligohymenophorea, Lobosea, Rotatoria, and Branchiopoda were observed relatively frequently. These communities of phytoplankters and zooplankters have been balanced with each other and were thought to keep the ecosystem of this pond. Key Words: Eutrophication, Kado-ike pond, Plankton, Water quality 䠍䠊䛿䛨䜑䛻 㛛ụ ࠊࡣ㟼ᒸ┴ὠᕷࡢᮾࡢ㝠ᆅᇦ࠶ ࠊỤᡞ ௦㎰ᴗࡓࡢ℺ࡢ₅⏝⁀ụࡋഛ ࠊ⏝ࡉ ࡁ⌧ࠋࡓᅾࡢ㛛ụࡢᴫせ ࠊࡣ࿘ᅖ⣙ 1.3 km ࠊ㠃✚⣙ 13.5 ha ࠊࡉ῝⣙ 5㹼6 m ࠶℺ࠋ₅⏝⁀ụ࠶ࡇࠊ㯤℩ ᕝ࿘ᅖࡢഃ⁁ὶ㎸ᰤ㣴ሷࡀ␃ࡍࡇ㉳ ࡇᐩᰤ㣴Ỉ㉁ࡢᝏࡀၥ㢟ࡗ࡞࠸ࡉࠋ ࠊࡣẖᖺኟᏘ࡞ῐỈ㉥₻ࡢ✀࠶ࡀࢥⓎ⏕ ࡋࠊỈ⥳ࡢⰍ⮯ẼࡢⓎ⏕ࡀ㉳ࡇࡓࡢࡑࠋᡃ ࠊࡣࠎ㛛ụ ࡢ7, 8 ᭶ᮇࡢỈ㉁࠸ࡘࠊ2006 ᖺὠ㧗ᑓබ 㛤ㅮᗙࠕ㛛ụ⎔ቃㄪᰝ㝲㸟㛤ㅮࠊࡋ㏆㞄ࡢᑠ୰Ꮫ⏕ ඹࡢࡑࢱࢽࢢ⥆ࡅࡓࡁ[1-4] ࠋࠎᐇࡉụỈࡢ㒊Ỉసᴗ ࠊⱝᖸࡢỈ㉁ࡢᨵၿഴࡣぢ ࠊࡢࡢụ⾲ࡢᒙ῝ᒙࡢỈ⎔ቃࡢ㐪ࡣ࠸ゎᾘࡉ ࠊࡎ᰿ᮏⓗ࡞ᨵၿࡗ⮳ࡣ ࠋ࠸࡞࠸ࡢࡇ࡞࠺ᐩᰤ㣴 ࠊࡣụỈ୰ࡢᚤᑠ⏕≀ࡢቑṪࡉࡑࡣࡢᤕ㣗⪅࠶ᆺ⏕ࡢ≀⏕ࡢែᙳ㡪 ࠼ࡢ⪃࠼[5] ࠋᡃ ࠊࡣࠎ㛛ụࡢỈ㉁ㄪᰝ⾜ ࠺ ࠊ⥆ⓗụỈ୰ࡢᚤᑠ⏕≀ᐃᛶⓗ㢧ᚤ㙾 *1 ≀㉁ᕤᏛ⛉ Department of Chemistry & Biochemistry *2 ᢏ⾡ᐊ Technical Support Division ほᐹࡍࡇ⾜ࡗࡇࡑࠋࡓࡁᅇ ࠊࡣ2006㹼2019 ᖺࡢᮇ㛫㛛ụほᐹࡉࡓᚤᑠ⏕≀࠸ࡘሗ࿌ࡍ ࠋ䠎䠊ㄪᰝ᪉ἲ 2006, 2007, 2008, 2009, 2010, 2011, 2016, 2017, 2018, 2019 ᖺ ࡢ7 ᭶࠶ ࡣ࠸8 ᭶㛛ụ᥇ࡓࡋỈ ࠸ࡘ ࠊගᏛ㢧ᚤ㙾⏝࠸ᚤᑠ⏕≀ࡢほᐹ⾜ ࠋࡓࡗᚤᑠ⏕ ≀ࡀほᐹࡉࡓụࡢᆅⅬ࠸ࡘ ࠊࡣሗࡀṧࡉ ࡞࠸࠸ࡀࡢከ ࠋ࠸ ࠊࡓᚤᑠ⏕≀ࡢ㔞㛵ࡍሗ ࠊࡃ࡞ࡣᖺࡢほᐹ᪉ἲࡢ㐪࠸≉ᐃࡢ௰㛫ࡢᚤᑠ⏕≀ࡢほᐹࡋ࠸ሙ࠶ࡓࡢࡇࠊほᐹ⤖ᯝඃ༨✀ ⤒ࡢࡑᖺࡢኚ㑄➼ウࡍࡇࡣᅔ㞴࠶ ࡋ ࠋ࠸࡞䠏䠊⤖ᯝ䛚䜘䜃⪃ᐹ 2006㹼2019 ᖺࡢᮇ㛫㛛ụほᐹࡉࡓᚤᑠ⏕≀ࡢᒓ ほᐹࡉࡓᖺ࠸ࡘ⏕ࡢࡑࠊ≀ศ㢮Ꮫ✀ࡢࡈ⾲ 1 ♧ ࠋࡓࡋࡑࠊࡓࡒࡢ㢧ᚤ㙾┿ᅗ 1 ♧ ࡋ ࠋࡓᅗ 1 ࡢ┿グࡉ␒ࡓ࠸ࡘ ⾲ࠊࡣ1 ࡢ┿ ␒ཧ↷ࡉࠊ࠾࡞ࠋ࠸ࡓࢺࢡࡢ✀ࡢᐃ ⇍ࡣ⦎ᚲせࡋᅔ㞴ࡇ࡞ࡀከࡇ࠸ ࠊᅇࡢሗ࿌ ࡣࡑࡒᒓࡢᐃ␃ ࠋࡓ37 沼津工業高等専門学校研究報告 第 54 号,2020 年 1 月
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Abstract: In this study, we reported aquatic micro-organisms observed at Kado-ike pond, an irrigation pond in Numazu City, Shizuoka, in summer of 2006-2019. Kado-ike pond is an eutrophic pond and blue-green algae are blooming. In observation with microscope, 12 genera of unicellular prokaryotes, 70 genera of unicellular eukaryotes including 22 genera of protozoans, 18 genera of multicellular eukaryotes (metazoans), and 1 genus of a higher plant were found. Some micro-organisms of Cyanophyceae, Bacillariophyceae, Chlorophyceae, Oligohymenophorea, Lobosea, Rotatoria, and Branchiopoda were observed relatively frequently. These communities of phytoplankters and zooplankters have been balanced with each other and were thought to keep the ecosystem of this pond.
Key Words: Eutrophication, Kado-ike pond, Plankton, Water quality