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Allochthonous Organic Matter Contribution to Foodweb in Shingu Agricultural Researvoir after Rainfall Period

강우기 후 신구 농업용 저수지 먹이망에 미치는 외부기원 유기물의 영향 - 안정동위원소비 활용 -

  • Kim, Min-Seob (Department of Marine Science and Convergence Technology, Hanyang University) ;
  • Lee, Yeon-Jung (Department of Marine Science and Convergence Technology, Hanyang University) ;
  • An, Kwang-Guk (Department of Bioscience and Biotechnology, Chungnam University) ;
  • Kim, Baik-Ho (Department of Life Science, Hanyang University) ;
  • Hwang, Soon-Jin (Department of Environmental Science, Konkuk University) ;
  • Shin, Kyung-Hoon (Department of Marine Science and Convergence Technology, Hanyang University)
  • 김민섭 (한양대학교 해양환경융합과) ;
  • 이연정 (한양대학교 해양환경융합과) ;
  • 안광국 (충남대학교 생명과학부) ;
  • 김백호 (한양대학교 생명과학과) ;
  • 황순진 (건국대학교 환경과학과) ;
  • 신경훈 (한양대학교 해양환경융합과)
  • Received : 2014.03.15
  • Accepted : 2014.03.31
  • Published : 2014.03.31

Abstract

The origin of particulate organic matter (POM) and food web structure were investigated in Shingu reservoir based on stable isotope analysis from pre-monsoon (July) to post-monsoon (September) 2007. According to the depth in Shingu reservoir, the $^{13}C$ and $^{15}N$ values of POM for pre-monsoon period were nonsignificant distinction, while it was significant variation after rainfall period. The ${\delta}^{13}C$ values of POM in premonsoon period ranged from -25.1‰ to -26.1‰ in whole water column, but the ${\delta}^{13}C$ values of POM in post-monsoon period showed relatively wide range between -23.2‰ and -27.5‰. The apparently lighter values (average -27.5‰) in near bottom water (7 m water depth) demonstrate that POM in high turbid water in post-monsoon period may be derived from the outside terrestrial plants (allochthonous) through heavy rainfall during the summer monsoon period. After rainfall period, $^{13}C$ and $^{15}N$ values of D. brachyurum showed -23.3‰ and 12.2‰, respectively, while B. longirostris showed -27.1% and 8.7%, respectively. It suggested that D. brachyurum mainly feed on POM in autochthonous organic matter pool, but B. longirostris mainly consumed POM in allochthonous organic matter pool after rainfall period. Carbon and nitrogen stable isotope ratios were markedly different among secondary consumers. The carp (C. carpio) and catfish (S. asotus) were in the higher trophic level and crucian carp (C. auratus) and mudfish (M. mizolepis) were in the lower trophic level. $^{13}C$ and $^{15}N$ values of Z. platypus didn't significantly changed between before and after rainfall period. But P. parva and C. auratus apparently changed the $^{13}C$ and $^{15}N$ values after rainfall period. It is suggested that P. parva and C. auratus seem to feed allochthonous food source while Z. platypus depend on autochthonous food source.

Acknowledgement

Supported by : 한국연구재단, 농림부

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