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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.38, no.4, 2005³â, pp.445-453
´ã¼ö¼º ½Ä¹°ÇöûũſÀÇ Å©±âº° µ¿Å¿¡ ´ëÇÑ »óÇâ½Ä, ÇÏÇâ½Ä Á¶Àý°£ÀÇ »ó´ëÀû Á߿䵵 Á¶»ç: II. Åë°è ¸ðµ¨¸µ ºÐ¼®À» ÀÌ¿ëÇÑ Á¶ÀýÀÎÀÚ ºÐ¼®
( Relative Importance of Bottom-up vs. Top-down Controls on Size-structured Phytoplankton Dynamics in a Freshwater Ecosystem: II. Investigation of Controlling Factors using Statistical Modeling Analysis )
¼ÛÀº¼÷;ÀÓÀå¼·;Àå³²ÀÍ;½Å¿ë½Ä; ÀüºÏ´ëÇб³ ÀÚ¿¬°úÇдëÇÐ È­Çаú;¸ñÆ÷ÇØ¾ç´ëÇб³ ÇØ¾çÀüÀÚ Åë½Å°øÇкÎ;±¹¸³È¯°æ¿¬±¸¿ø ¿µ»ê°­¹°È¯°æ¿¬±¸¼Ò;¸ñÆ÷ÇØ¾ç´ëÇб³ ÇØ¾ç½Ã½ºÅÛ°øÇкÎ;
 
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Àü³² ÁÖ¾ÏÈ£¿¡¼­ÀÇ ½Ä¹°Çöûũſ µ¿Å¸¦ ÆÄ¾ÇÇϱâ À§ÇØ 2003³â 2¿ùºÎÅÍ 10¿ù±îÁö ½Ä¹°Çöûũſ »ý¹°·® (Ŭ·Î·ÎÇÊ a)ÀÇ Å©±âº° ½Ã ${cdot}$ °ø°£Àû º¯µ¿°ú Á¦¹Ý ȯ°æ¿äÀο¡ ´ëÇØ Á¶»çÇÏ¿´´Ù. º» ³í¹®¿¡¼­´Â ÁÖ¾ÏÈ£¿Í °°Àº ´ã¼öÈ£¿¡¼­ ½Ä¹°ÇöûũſÀÇ Å©±â ±¸Á¶°¡ °èÀýÀû, °ø°£ÀûÀ¸·Î ³ªÅ¸³ª´Â º¯µ¿¿¡ ´ëÇÑ ¿µ¾ç¿°µéÀÇ ¿µÇâÀ» ȸ±ÍºÐ¼®À» ÅëÇØ ÆÄ¾ÇÇϰíÀÚ ÇÏ¿´´Ù. ¶ÇÇÑ ÀΰøÁö´É¸ÁÀ» ÀÌ¿ëÇÏ¿© Àüü ½Ä¹°ÇöûũſÀÇ »ý¹°·®(Ŭ·Î·ÎÇÊ a)¿¡ ´ëÇÑ »óÇâ½Ä, ÇÏÇâ½Ä Á¶ÀýÀÎÀڵ鿡 ´ëÇÑ »ó´ëÀûÀÎ Á߿䵵¸¦ Á¤·®ÀûÀ¸·Î ÆÄ¾ÇÇϰíÀÚ ÇÏ¿´´Ù. ºñ·Ï µ¿¹°Çöûũſ Æ÷½Ä¾ÐÀ» ³ªÅ¸³»´Â Æ÷½ÄÀ²À̳ª µ¿¹°Çöûũſ »ýü·® ´ë½Å Æ÷½Ä¾ÐÀÇ °£Á¢ Áö¼öÀÎ chlorophyll a: pheopigments ratio¸¦ Ȱ¿ëÇÏ¿´Áö¸¸ ȸ±ÍºÐ¼®°á°ú, ¿µ¾ç¿° ƯÈ÷ Àλ꿰°ú ½Ä¹°ÇöûũſÀÇ »ý¹°·®ÀÌ ¾çÀÇ »ó°ü°ü°è¸¦ °®´Â °ÍÀ¸·Î ³ªÅ¸³µ°íchlorophyll a: pheopigments ratioµµ °áÁ¤°è¼ö°¡ ´Ù¼Ò ³·±â´Â ÇÏÁö¸¸ ¾çÀÇ »ó°ü°ü°è¸¦ º¸¿© ÁÖ¾ú´Ù. ÀΰøÁö´É¸Á ½Ã¹Ä·¹ÀÌ¼Ç °á°ú¿¡¼­´Â ÁÖ¾ÏÈ£ ½Ä¹°ÇöûũſÀÇ »ý¹°·®Àº ¼ö¿Â, ¿µ¾ç¿° ƯÈ÷ Àλ꿰°ú °°Àº »óÇâ½Ä Á¶ÀýÀÌ ¿ì¼¼ÇÑ °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
Relative importance between bottom-up and top-down controls on phytoplankton dynamics was investigated in the Juam Reservoir, Chonnam based on the results from statistical analyses including regression and artificial neural network (ANN) modeling. Effects of nutrients on size-structured phytoplankton dynamics were explored by simple linear regression analysis and relative importance between bottom-up and top-down controls was estimated based on results from the artificial neural network analyses. Although there is a limitation in determining direct grazing effects since chlorophyll a : pheopigments ratios, indirect index for grazing activity rather than grazing rates or herbivores biomass were used, the results from regression analysis showed that nutrients especially orthophosphates were positively correlated with the phytoplankton biomass and chlorophyll a : pheopigments ratios were also positively correlated with the phytoplankton biomass at lower coefficient of determination ($r^2$) compared to orthophosphates. The simulation results from ANN suggested that the bottom-up mechanisms including water temperature and availability of nutrients, especially orthophosphates were more important than top-down mechanisms such as grazing in the phytoplankton dynamics.
 
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artificial neural networks;controlling factors;nutrients;Lake Juam;phytoplankton;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.38, no.4, 2005³â, pp.445-453
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200518317185574)
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