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Functional Evaluation of Small-scale Pond at Paddy Field as a Shelter for Mudfish during Midsummer Drainage Period

논 중간 낙수기에 미꾸라지 피난처로서 둠벙의 기능 평가

  • Kim, Jae-Ok (Rural Research Institute Korea Rural Community Corporation) ;
  • Shin, Hyun-Sang (Rural Research Institute Korea Rural Community Corporation) ;
  • Yoo, Ji-Hyun (Rural Research Institute Korea Rural Community Corporation) ;
  • Lee, Seung-Heon (Rural Research Institute Korea Rural Community Corporation) ;
  • Jang, Kyu-Sang (Rural Research Institute Korea Rural Community Corporation) ;
  • Kim, Bom-Chul (Department of Environmental Science, Kangwon National University)
  • 김재옥 (한국농어촌공사 농어촌연구원) ;
  • 신현상 (한국농어촌공사 농어촌연구원) ;
  • 유지현 (한국농어촌공사 농어촌연구원) ;
  • 이승헌 (한국농어촌공사 농어촌연구원) ;
  • 장규상 (한국농어촌공사 농어촌연구원) ;
  • 김범철 (강원대학교 환경과학과)
  • Received : 2011.01.28
  • Accepted : 2011.03.15
  • Published : 2011.03.31

Abstract

BACKGROUND: The purpose of this study was to evaluate ecological function of small-scale pond and movement characteristics of mudfish (Misgurnus mizolepis) during midsummer drainage period. METHODS AND RESULTS: In situ experiments were performed in the paddy field with mudfish under the condition of midsummer drainage from 13 July to 29 July 2010. The mudfish used in this experiment is approximately 1,000 individuals with a cut tail. Mudfishs were released in the rice field before midsummer drainage and caught again in the small-scale pond and the paddy field after midsummer drainage. Results showed that the abundance of mudfish was higher in drainage canal than small-scale pond at the early stage of midsummer drainage, because flow was formed toward the drainage canal. In that time, 3% of the total marked mudfish were captured at outlet of drainage canal. As the paddy was drying, 5% of total marked mudfish moved to the small-scale pond during midsummer drainage period. Contrary to the general hypothesis, the marked mudfish was not found in holes in paddy field.of total caught in the small-scale pond ingested mainly animal prey, and it's frequency of empcy stomach was 10%.oOn the other hand, all m total collected in the paddy field showed empcy stomach. It was apparent from the experiment that m total are eeldng normally in the small-scale pond, while m total are not eat properly in paddy field. CONCLUSION(s): As the paddy was drying, mudfish moved to the small-scale pond during midsummer drainage period but mudfish was not found in holes in paddy field. It can be concluded that small-scale provides a shelter and prey to mudfish in the midsummer drainage period.

본 연구의 목적은 논의 중간 낙수 기간 동안 미꾸라지의 이동 특성을 살펴보는 것이다. 실험 결과, 미꾸라지는 중간 낙수 초기에는 배수로 쪽으로 수로가 형성되어 둠벙보다는 배수로 쪽으로 이동하는 경향이 있었다. 전체 표지한 미꾸라지 중 약 3.0%가 배수초기에 배수로를 통해 농업용 배수로로 이동한 것으로 나타났다. 중간 낙수가 완료되어 논에 물이 없는 시기에는 전체 표지 미꾸라지 중 5.0%의 미꾸라지가 둠벙으로 이동하여, 중간 낙수기간 동안 둠벙을 피난처로 이용한다는 것을 알 수 있었다. 실험기간동안 표식한 미꾸라지 중 논 바닥을 파고들어 가는 것은 채집되지 않았다. 둠벙이 있는 논에서는 바닥을 파고 들어가기보다는 둠벙으로 이동하는 것을 선호한 것인지 아니면 표식에 의한 스트레스로 바닥을 파고들어갈 힘이 부족했던 것인지에 대해서는 추가적인 연구가 필요하다. 둠벙과 논에서 채집한 미꾸라지의 소화관 내용물을 분석한 결과, 둠벙에서는 동물성 먹이가 86.1%, 식물성 먹이가 13.9%를 차지하여 동물성 먹이가 매우 우세하였다. 둠벙에서 채집된 미꾸라지 중 90% 이상이 먹이를 섭식하고 있었으며 10% 정도가 공복상태를 보이고 있어 표식 후 방류한 미꾸라지가 둠벙에서 정상적인 섭식 활동을 한 것으로 사료된다. 반면 논에서 채집된 미꾸라지는 모든 개체가 공복 상태를 보이고 있어 섭식활동에 장애를 받은 것으로 나타났다.

Keywords

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