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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.34, no.1, 2001³â, pp.45-53
SuwaÈ£ ÇÏ·ùÇÏõ¿¡¼­ÀÇ ³²Á¶·ù µ¶¼ÒÀÇ µ¿ÅÂ
( Dynamics of Cyanobacterial Toxins in the Downstream River of Lake Suwa )
±è¹üö;¹ÚÈ£µ¿;;Ȳ¼øÁø;±èÈ£¼·; °­¿ø´ëÇб³ ȯ°æ°úÇаú;ìíÜâ¡¡ãáñ¶ÓÞùÊ¡¡Úªòõâàü»ùÊΡ;ìíÜâ¡¡ãáñ¶ÓÞùÊ¡¡Úªòõâàü»ùÊΡ;°Ç±¹´ëÇб³ Áö¿ª»ýŽýºÅÛ°øÇаú;°Ç±¹´ëÇб³ Áö¿ª»ýŽýºÅÛ°øÇаú;
 
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³²Á¶·ù ¹°²ÉÇö»óÀÌ ³ªÅ¸³ª´Â ÀϺ»ÀÇ SuwaÈ£¿¡¼­ ¹æ·ù¼ö¸¦ ÅëÇØ ÇÏ·ùÇÏõ (Tenryu°­°ú Nishitenryu ¼ö·Î)À¸·Î À¯ÃâµÈ ³²Á¶·ù¼¼Æ÷¿Í ³²Á¶·ù µ¶¼Ò (microcystin-LR,-RR, YR)ÀÇ À¯ÇϰúÁ¤¿¡¼­ÀÇ º¯µ¿À» 1998³â 5¿ùºÎÅÍ 10 ¿ù±îÁö Á¶»çÇÏ¿´´Ù. ÇÏõ ³» ¸ðµç ÁöÁ¡¿¡¼­ ½Ä¹°Çöûũſ Á¾Á¶¼ºÀº »ó·ùÀÇ È£¼ö¿Í ÀÏÄ¡ÇÏ¿´´Ù. 6¿ù°ú 7¿ù¿¡ ¿ìÁ¡ÇÑ ³²Á¶·ù´Â M. ichthyoblabe¿´°í, 8¿ùºÎÅÍ Áõ°¡ÇÑ M. viridis´Â 10¿ù±îÁö ¿ìÁ¡Á¾À̾ú´Ù. MicrocystinÀº ³²Á¶·ùÀÇ ÇöÁ¸·®ÀÌ Áõ°¡ÇÑ 7¿ùºÎÅÍ °ËÃâµÇ±â ½ÃÀÛÇÏ¿© ³²Á¶·ù ¼¼Æ÷¹ÐµµÀÇ °èÀýº¯µ¿¿¡ µû¶ó ³óµµ°¡ º¯µ¿ÇÏ¿´À¸¸ç, 3Á¾·ù microcystinÀÇ Á¶¼ºº¯È­´Â ³²Á¶·ù Á¾Á¶¼º°ú °ü·ÃÀÌ ÀÖ¾ú´Ù. Microcystis. ichthyoblabe°¡ ¿ìÁ¡ÇÑ 7¿ù¿¡´Â MC-RR°ú -LR¸¸ÀÌ °ËÃâµÈ ¹Ý¸é, M. viridis°¡ ¿ìÁ¡ÇÑ 8¿ù ºÎÅÍ 10¿ù±îÁö´Â 3Á¾·ùÀÇ microcystinÀÌ ¸ðµÎ °ËÃ⠵Ǿú´Ù. MicrocystinÀº È£¼ö·ÎºÎÅÍ 32 km ¶³¾îÁø ÇÏ·ùÁöÁ¡¿¡¼­µµ 3.2${sim}$0.3 ${mu}$g/lÀÇ ³óµµ·Î °ËÃâµÇ¾ú´Ù. Tenryu°­ ÁöÁ¡ 2¿Í ÁöÁ¡ 5»çÀÌÀÇ 29 km ±¸°£ (À¯ÇϽð£ 11½Ã°£)¿¡¼­ ¼¼Æ÷¹Ðµµ¿Í microcystin ³óµµÀÇ °¨¼ÒÀ²Àº °¢°¢ 73%, 72%À̾ú°í, Èñ¼®¿¡ ÀÇÇÑ ¼¼Æ÷¹Ðµµ¿Í microcystin ³óµµÀÇ °¨¼ÒÀ²ÀÌ °¢°¢ 61%¿Í 57%·Î¼­ °¨¼Ò¿äÀÎÀÇ ´ëºÎºÐÀ» Â÷ÁöÇÏ¿´´Ù. Àΰø¼ö·Î¿¡¼­´Â ÀÚ¿¬ÇÏõº¸´Ù ³²Á¶·ù ¼¼Æ÷¿Í µ¶¼ÒÀÇ Á¦°ÅÀ²ÀÌ ´õ ³·¾Ò´Ù. ÀÌ·¯ÇÑ °á°úµéÀº ³²Á¶·ù°¡ ¹ø¼ºÇÑ ºÎ¿µ¾çÈ£ÀÇ ÇÏ·ùÇÏõ¿¡¼­´Â ¸Õ °Å¸®±îÁö ³²Á¶·ùÀÇ µ¶¼Ò°¡ Àü´ÞµÇ¾î °øÁߺ¸°Ç¿¡ À§ÇؼºÀ» ÁÙ ¼ö ÀÖÀ½À» º¸¿© ÁÖ°í ÀÖ´Ù.
Transport of cyanobacterial toxins (microcystin-LR, -RR, -YR) were assessed from a eutrophic lake, Lake Suwa, through the outflowing river, the Tenryu River, and its irrigation channel branch. Temporal variation of phytoplankton species composition in the river coincided with those of the lake; Microcystis ichthyoblabe dominated from June to July, and M. viridis dominated from August to September. When cyanobacterial bloom occurred, microcystins were continuously detected at the concentration of $0.3{sim}3.2;{mu}g/l$ even at 32 km downstream. The change of the content of three microcystin variants were related both with the total cell density of Microcystis and with the change of Microcystis species composition. When Microcystis ichthyoblabe dominated during July, only microcystin-RR (MC-RR) and -LR (MC-LR) were detected, while when Microcystis viridis dominated between August and October, microcystin-RR,-YR (MC -YR) and -LR were detected. Along 29 km flowing distance (flow time 11 hours) between site 2 and site 5 in the Tenryu River, cyanobacterial density and microcystin concentration were reduced by 73% and 72%, respectively, which is mostly contributed by the dilution effect of tributary waters (61% and 57%, respectively) . In the artificial irrigation channel microcystins and cyanobacterial cells were decreased less than in the natural river. The results indicate that cyanobacterial toxins can be transported far downstream without much removal and give hazards to water usage in downstream of eutrophic lakes with cyanobacterial blooms.
 
Ű¿öµå
Lake Suwa;Microcystin;River;Tenryu River;Transport;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.34, no.1, 2001³â, pp.45-53
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200118317176803)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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