Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Characteristics of External and Cranial Morphological Characters of Asian Lesser White-Toothed Shrew (Crocidura shantungensis)

작은땃쥐 (Crocidura shantungensis)의 외부 형태 및 두개골 형질의 특성

  • Kim, Tae-Wook (Faculty of Science Education, Jeju National University) ;
  • Park, Su-Gon (Faculty of Science Education, Jeju National University) ;
  • Kim, Yoo-Kyung (Faculty of Science Education, Jeju National University) ;
  • Park, Jun-Ho (Faculty of Science Education, Jeju National University) ;
  • Adhikari, Pradeep (Faculty of Science Education, Jeju National University) ;
  • Kim, Ga-Ram (Faculty of Science Education, Jeju National University) ;
  • Park, Seon-Mi (Faculty of Science Education, Jeju National University) ;
  • Lee, Jun-Won (Faculty of Science Education, Jeju National University) ;
  • Han, Sang-Hyun (Educational Science Research Institute, Jeju National University) ;
  • Oh, Hong-Shik (Faculty of Science Education, Jeju National University)
  • 김태욱 (제주대학교 과학교육학부) ;
  • 박수곤 (제주대학교 과학교육학부) ;
  • 김유경 (제주대학교 과학교육학부) ;
  • 박준호 (제주대학교 과학교육학부) ;
  • ;
  • 김가람 (제주대학교 과학교육학부) ;
  • 박선미 (제주대학교 과학교육학부) ;
  • 이준원 (제주대학교 과학교육학부) ;
  • 한상현 (제주대학교 교육과학연구소) ;
  • 오홍식 (제주대학교 과학교육학부)
  • Received : 2015.10.30
  • Accepted : 2015.12.10
  • Published : 2015.12.31
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Abstract

This study was conducted to screen the characteristics of external and cranial characters of Crocidura shantungensis collected from Korean Peninsula, Ulleung Island and Jeju Island. There were significant differences in head-body length (HBL), tail length (TL), ear length (EL), and hind foot length (HFL) in males and HBL, TL, and HFL in females among three populations (p<0.05). The HBL and TL in the Jeju Island population were larger (8.0 mm and 4.0 mm in lengths, respectively) than those of the Korean Peninsula population. Based on skull analysis, a total of thirteen traits showed significant differences among the three populations (p<0.05). The condylo-insicive length (CIL), maximum width of brain case (MWB), mandibular length (ML), and mandibular height (MH) in the Jeju Island population were significantly larger than those of Korean Peninsula population (p<0.05). Principle component analysis (PCA) showed that two principle components (PC) identified from the PCA affected on the body size and width of the skull, respectively. Discriminant analysis revealed that these populations could be discriminated through skull traits. These findings concluded that the Jeju Island population was greater in the size than the Korean Peninsula, suggesting that the Jeju Island shrews have successfully adapted to the island environments and they had morphologically differentiated during glacial period after natural immigration into that Island. Thus, this study supports the 'Island Rule', showing that the population is well adapted to the island environments. This may provide important information for biogeographical and ecological studies on insular animals.

본 연구는 한반도, 울릉도, 제주도에서 수집한 작은땃쥐 (Crocidura shantungensis)의 외부형태와 두개골 형질의 특성을 살펴보기 위하여 수행하였다. 외부형태 비교 결과, 수컷은 HBL, TL, EL, HFL 등 조사된 모든 크기 형질에서 (p<0.05), 암컷은 HBL, TL, HFL에서 세 집단 사이의 유의차가 관찰되었다 (p<0.05). 제주도 집단은 HBL이 한반도 집단보다 약 8.0 mm 이상 더 길고, TL은 약 4.0 mm 이상 더 길었다. 두개골 형질에 대한 분석결과, 조사된 16개 형질 가운데 13개 형질에서 작은땃쥐 세 집단 사이의 유의적인 차이가 발견되었다 (p<0.05). 주성분 분석에서 결정된 2가지 주성분들은 두개골의 전반적인 크기와 좌우 너비가 중요하게 작용하였다. 판별 분석결과에서 두개골 형질에 의한 제주도와 한반도-울릉도 집단은 뚜렷하게 구분되었다. 제주도 집단이 한반도 집단에 비해 외부형태와 두개골이 더 크다는 본 연구결과는 C. shantungensis가 제주도로 유입된 이후 빙하기를 거치는 동안 성공적으로 제주도 환경에 적응하면서 형태적으로 분화되었음을 제안하였다. 본 연구결과는 섬 환경에 적응된 집단에서 나타나는 섬 법칙을 지지하고 있으며, 향후 섬 동물의 생물지리학과 생태학 연구에 중요한 역할을 수행할 것이다.

Keywords

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