Applied Microscopy

  • 제40권1호
  • /
  • Pages.37-45
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  • 2010
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  • 2287-5123(pISSN)
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  • 2287-4445(eISSN)
한국현미경학회 (Korean Society of Microscopy)
권호 표지

우수리땃쥐 Crocidura lasiura의 치아 마모에 의한 연령결정과 번식의 계절적 변이의 조직학적 분석

Age Determination by Tooth Wear and Histological Analysis of Seasonal Variation of Breeding in the Big White-Toothed Shrew, Crocidura lasiura

  • 정순정 (조선대학교 치과대학 구강조직발생학교실) ;
  • 윤명희 (경성대학교 자연과학대학 자연과학부) ;
  • 최정미 (부산정보대학 치위생학과) ;
  • 김현대 (동부산대학교 치위생학과) ;
  • 임도선 (을지대학교 치위생학과) ;
  • 박진주 (조선대학교 치과대학 구강조직발생학교실) ;
  • 최백동 (조선대학교 치과대학 구강조직발생학교실) ;
  • 정문진 (조선대학교 치과대학 구강조직발생학교실)
  • Jeong, Soon-Jeong (Department of Oral Histology & Embryology, School of Dentistry, Chosun University) ;
  • Yoon, Myung-Hee (Division of Natural Science, College of Science, Kyungsung University) ;
  • Choi, Jung-Mi (Department of Dental Hygiene, Busan College of Information Technology) ;
  • Kim, Hyun-Dae (Department of Dental Hygiene, Dong-Pusan College University) ;
  • Lim, Do-Seon (Department of Dental Hygiene, Eulji University) ;
  • Park, Jin-Ju (Department of Oral Histology & Embryology, School of Dentistry, Chosun University) ;
  • Choi, Baik-Dong (Department of Oral Histology & Embryology, School of Dentistry, Chosun University) ;
  • Jeong, Moon-Jin (Department of Oral Histology & Embryology, School of Dentistry, Chosun University)
  • 투고 : 2010.02.28
  • 심사 : 2010.03.23
  • 발행 : 2010.03.31
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초록

포획된 야생의 우수리땃쥐 Crocidura lasiura는 구치의 마모와 높이를 이용하여 3개의 연령군으로 분류하였고 번식과 생식기관의 계절적 변이를 조사하였다. 유수들은 구치에서 마모를 가지지 않았고 세 번째 구치 높이가 첫 번째와 두 번째 구치보다 낮았고 비번식상태만을 가졌다. 아성수들은 약간의 마모를 가졌고 세 번째 구치가 첫 번째와 두 번째 구치 높이에 도달했고 성수들은 구치에 깊은 마모를 가졌으며 아성수와 성수는 계절에 따라 번식 혹은 비번식상태를 가졌다. 조직학적 관찰을 근거로 아성수와 성수 수컷의 번식상태는 2월 초에서 10월 초까지 유지되었고 4월에 가장 높은 번식활동을 보였으며 암컷의 번식 상태는 3월 말에서 10월까지 유지되어, 수컷이 암컷보다 빨리 성적 성숙에 이르는 것으로 밝혀졌다. 반면 번식상태는 비번식기 동안 중단되며 이것은 식량자원인 토양 무척추동물의 부족때문이라 생각된다. 번식기의 아성수와 성수들은 많은 생식세포들로 채워진 확장된 세정관을 가지는 큰 정소와 많은 정자들을 가진 팽창된 부정소 미부를 가졌고 10.0 g 이상의 몸무게와 0.03 g 이상의 정소와 부정소 무게를 가졌다. 번식기의 암컷들은 4~6개의 새끼를 가진 임신상태이거나 난소에 성숙난포들과 황체를 가졌고 9.6 g 이상의 몸무게를 가졌다.

Captured wild specimens of the big white-toothed shrew, Crocidura lasiura were classified into three age classes by tooth wear and height of molars, and seasonal variations of breeding and reproductive organs were examined. Juveniles had not tooth wear in molars and height of the third molars were lower than the first and second molars, and had only non-breeding condition. Young adults had little tooth wear and the third molars reached to the first and second molars, and old adults had heavy tooth wear in molars, young adults and old adults had breeding or non-breeding condition according to the season. On the basis of histological examination, seasonal variations of breeding were confirmed that breeding condition of young and old adult males were continued from early February to early October although the breeding activity was the highest in April, that of females were continued from the end of March to October, males reached sexual maturity earlier than females. Whereas the breeding condition seems to cease for non-breeding season because of the deficiency of food resources, soil invertebrates. Young and old adult males of the breeding season had large testes with enlarged seminiferous tubules that were filled with numerous germ cells, and expanded caudal epididymides with a vast number of spermatozoa, and were more than 10.0 g in the body weight and 0.03 g in the testis and epididymis weight. The females of the breeding season were pregnant condition with 4~6 litters or had the Graafian follicles and the corpus lutea in the ovary, and were more than 9.6 g in the body weight.

키워드

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