생태와환경 (Korean Journal of Ecology and Environment)

  • 제49권4호
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  • Pages.334-342
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  • 2016
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  • 2288-1115(pISSN)
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  • 2288-1123(eISSN)
한국수생태학회 (The Korean Society of Limnology)
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일본잎벌레 (Galerucella nipponensis Laboissiere)의 분포와 먹이원 분석

Distribution and Food Source Analysis of Galerucella nipponensis Laboissiere

  • 최종윤 (국립생태원 생태평가연구실) ;
  • 김성기 (국립환경과학원 낙동강물환경연구소) ;
  • 권용수 (국립생태원 생태평가연구실) ;
  • 김남신 (국립생태원 생태평가연구실)
  • 투고 : 2016.10.28
  • 심사 : 2016.12.26
  • 발행 : 2016.12.31
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초록

국내 일본잎벌레의 분포와 생태 특성을 연구하기 위해 낙동강 중하류권에 위치한 38개의 습지 및 하천에서 일본잎벌레와 수생식물, 환경요인에 대한 조사를 수행하였다. 조사 지역 중 총 32개소에서 일본잎벌레의 출현이 확인되었으며, 이들의 분포는 마름의 생물량에 영향받는 것으로 나타났다(t=2.173, $r^2=0.013$, p<0.05). 일본잎벌레의 공간분포뿐만 아니라 계절분포를 연구하기 위해 조사지역 중 개체수가 가장 많은 습지(번개늪)를 선정하여 3년간 추가적인 조사를 수행하였다. 조사 결과, 일본잎벌레는 초봄($15{\sim}17^{\circ}C$, 4월)부터 성장하기 시작하여 여름철(7~8월)에 최대성장에 이르는 것으로 관찰되었다. 알이나 유생 등은 성체와 달리 초봄(4~5월)에만 주로 관찰되었다. 강우량은 일본잎벌레의 계절분포에 강하게 영향을 주는 것으로 나타났으며, 강우가 상대적으로 적은 2015년에 상대적으로 높은 개체수가 관찰되었다. 안정동위원소 분석 결과, 일본잎벌레는 마름의 침수되지 않은 잎을 주 먹이원으로 활용하였으며, 다른 식물은 기여도가 높지 않았다. 그러나 일본잎벌레에 대한 마름의 활용은 마름의 성장이나 마름이 포함된 식생대의 식물 구성에 거의 영향을 미치지 않는 것으로 나타났다. 이는 마름은 일본잎벌레에게 먹이원인 동시에 산란터로서 활용되기 때문에 과도하지 않은 섭식을 통해 산란처를 지속적으로 유지하려고 하는 전략인 것으로 사료된다.

In this study, we explain the environmental variables that mainly influence the spatial and seasonal pattern of Galerucella nipponensis in 38 wetland and stream located at mid-low Nakdong River. G. nipponensis were found at total of 32 wetland, was strongly positively correlated with the biomass of Trapa japonica (t=2.173, $r^2=0.013$, p<0.05). In result of seasonal distribution during 3 years, the largest density of G. nipponensis adult were observed in summer (7~8 months), egg and larva was recorded in only early spring (4~5 months). Rainfall were negatively related with the seasonal distribution of G. nipponensis. They were more abundant in dry season (2015 year) than rainy seasons(2013~2014 year). Stable isotope analysis showed that the G. nipponensis consumed as food source no submerged leaf of T. japonica than other plant. However, utilization of T. japonica on Galerucella nipponensis were not influence to plant biomass and/or species composition in vegetated bed. Those considered as adaptive strategies for sustainable habitat maintenance that because T. japonica use as not only food source but also their lives for G. nipponensis.

키워드

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