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Ecological Niche and Interspecific Competition of Two Frog Species (Pelophylax nigromaculatus and P. chosenicus) in South Korea using the Geographic Information System

지리정보시스템을 이용한 한국산 참개구리와 금개구리의 생태적 지위와 종간 경쟁에 대한 연구

  • Ahn, Jeong-Yoon (Department of Environmental Science & Ecological Engineering, Korea University) ;
  • Choi, Seoyun (Department of Agriculture Forestry, and Bioresources, Seoul National University) ;
  • Kim, Hyeonggeun (National Institute of Biological Resources) ;
  • Suh, Jae-Hwa (National Institute of Biological Resources) ;
  • Do, Min Seock (National Institute of Biological Resources)
  • 안정윤 (고려대학교 환경생태공학부) ;
  • 최서윤 (서울대학교 산림과학부) ;
  • 김형근 (국립생물자원관 동물자원과) ;
  • 서재화 (국립생물자원관 동물자원과) ;
  • 도민석 (국립생물자원관 동물자원과)
  • Received : 2021.09.29
  • Accepted : 2021.12.17
  • Published : 2021.12.31

Abstract

An ecological niche is defined as the specific role of a species influenced by time, space, and other resources. By investigating overlaps between ecological niches of different species, we could estimate the degrees of interspecific competition. Such studies often use geographic information systems (GIS) to discover niche overlaps between species. In this study, we used GIS to estimate the spatial niches of two Korean frog species(Pelophylax nigromaculatus and P. chosenicus). This enabled us to predict their geographic distributions in order to identify their coexistence regions and distribution patterns. The results confirmed that altitude was an important variable for predicting their distribution, with a correlation with their climatic range. Spatial distributions of the two frog species were highly overlapped, as the distribution range for P. nigromaculatus included most of the range of P. chosenicus, showing a sympatric distribution pattern. Within the coexisting regions, however, the presence sites for the two species did not overlap, implying weak competition. To confirm the principal factors influencing their competitive relationship and reasons for their sympatric distribution pattern, we need more detailed in-depth studies on the diverse environmental variables within the regions where the two species coexist. By doing so, we would be able to identify various mechanisms for avoiding competition in sympatric frog species.

생태적 지위는 생물 종이 차지하는 특정 지위 또는 역할로 시간과 공간, 먹이자원에 의해 주요한 영향을 받으며, 중첩 정도에 따라 종간 경쟁관계를 밝혀낼 수 있기 때문에 지리정보시스템을 기반으로 다양한 연구들이 수행되고 있다. 본 연구에서는 한국에 서식하고 있는 Pelophylax속 참개구리(P. nigromaculatus)와 금개구리(P. chosenicus) 두 종의 공간적 생태정보를 통해 생태적 지위를 알아보고, 지리적 분포 범위를 예측하여 종간 공존지역과 분포 패턴에 대하여 알아보았다. 그 결과 두 종의 분포에 영향을 끼친 주요 변수는 고도로 확인되었으며, 고도는 종들이 분포한 기후와 상관관계를 나타내고 있었다. 두 종이 분포한 생태적 지위는 매우 높게 중첩되어 있었으며, 참개구리가 분포한 지역은 금개구리가 분포한 대부분 지역을 포함하는 동소적인 분포 패턴을 보였다. 공존하고 있는 지역에서 두 종이 출현한 지점들은 음의 상관관계를 나타내고 있어, 약한 경쟁이 발생하고 있음을 암시했다. 비록 본 연구에서는 종간 동소적 분포 형태를 나타낸 원인과 경쟁관계에 영향을 주는 주요한 요인에 대해서는 확인하지 못했지만, 추후 미시적인 관점에서 두 종이 함께 공존하는 지역을 대상으로 다양한 환경변수들에 대한 보다 세밀한 분석(필지, 수로, 논둑 등)이 수행된다면 종간 경쟁을 최소화하는 다양한 기작들을 확인할 수 있을 것이라고 판단된다.

Keywords

Acknowledgement

양서·파충류 분야 현장 조사에 참여해 주신 모든 조사원분들께 감사의 말씀을 전해드립니다.

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