Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Age Determination by Tooth Wear and Histological Analysis of Seasonal Variation of Breeding in the Lesser White-Toothed Shrew, Crocidura suaveolens

작은땃쥐 Crocidura suaveolens의 치아 마모에 의한 연령결정과 번식의 계절적 변이의 조직학적 분석

  • 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) ;
  • Kim, Sook-Hyang (Department of Dental Hygiene, Hanseo University) ;
  • Ham, Joo-Hyun (Department of Health Management, Hanseo University) ;
  • Lim, Do-Seon (Department of Dental Hygiene, Eulji University) ;
  • Choi, Baik-Dong (Department of Oral Histology & Embryology, School of Dentistry, Chosun University) ;
  • Park, Jin-Ju (Department of Oral Histology & Embryology, School of Dentistry, Chosun University) ;
  • Jeong, Moon-Jin (Department of Oral Histology & Embryology, School of Dentistry, Chosun University)
  • 정순정 (조선대학교 치과대학 구강조직발생학교실) ;
  • 윤명희 (경성대학교 자연과학대학 자연과학부) ;
  • 김숙향 (한서대학교 치위생학과) ;
  • 함주현 (한서대학교 건강관리학과) ;
  • 임도선 (을지대학교 치위생학과) ;
  • 최백동 (조선대학교 치과대학 구강조직발생학교실) ;
  • 박진주 (조선대학교 치과대학 구강조직발생학교실) ;
  • 정문진 (조선대학교 치과대학 구강조직발생학교실)
  • Received : 2010.08.02
  • Accepted : 2010.09.28
  • Published : 2010.09.30
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Abstract

Captured specimens of the lesser white-toothed shrew, Crocidura suaveolens were classified into three age classes by tooth wear and seasonal variations of reproductive organs were investigated. Molars of juveniles had not tooth wear and the height of the third molars were lower than the first and second molars, young adults had smooth tooth wear and the third molars reached to the first and second molars, and old adults had heavy tooth wear and the third molars also reached to the first and second molars. On the basis of histological examination, seasonal variation of breeding was confirmed that breeding season of adult males was from early February to early October, having a peak of the breeding in April and July, and non-breeding season was from in the middle of October to late January. Young and old adult males of the breeding season had large testes with enlarged seminiferous tubules filling with numerous germ cells and expanded caudal epididymides with a vast number of spermatozoa, Young and old adult males of the non-breeding season had the small testes with the extremely slender seminiferous tubules filling with only spermatogonia and the reduced caudal epididymides without spermatozoa. Males weighing more than 3.9 g in the body weight and 0.013 g in the testis and epididymis weight reached sexual maturation in breeding season, and the females weighing more than 3.8 g in body weight of the breeding season were pregnant condition having 5~6 litters or had the Graafian follicles and the corpus lutea in the ovary.

작은땃쥐 Crocidura suaveolens는 치아 마모도를 이용하여 3개의 연령군으로 분류하였고 생식기관의 계절적 변이를 조사하였다. 유수들의 구치는 치아 마모를 보이지 않았고 세 번째 구치의 높이가 첫 번째와 두 번째 구치보다 낮았으며, 아성수는 약간의 치아 마모를 보였고 세 번째 구치의 높이가 첫 번째와 두 번째 구치의 높이에 이르렀고, 성수들은 깊은 치아 마모를 보였으며 세 번째 구치 높이 역시 첫 번째와 두 번째의 구치에 도달하였다. 조직학적 조사를 근거로, 번식의 계절적 변이가 명확해졌으며, 수컷 성수의 번식 상태는 2월 초에서 10월 초까지 유지되었고 4월과 7월에 가장 높은 번식 활동을 보였고 비번식기는 10월 중순에서 1월 말까지였다. 번식기에 포획된 아성수와 성수 수컷은 다양한 생식세포들로 채워진 확장된 세정관을 가진 큰 정소와 많은 정자들을 가진 팽창된 부정소 미부를 가졌고 비번식기에 포획된 아성수와 성수 수컷들은 정원세포만으로 채워진 가늘어진 세정관을 가진 작은 정소와 정자를 가지지 않는 감소된 부정소를 가졌다. 몸무게가 3.9g 이상이고 정소와 부정소 무게가 0.013 g 이상인 수컷은 번식기에 성적 성숙에 도달하였고, 몸무게가 3.8 g 이상이고 번식기에 포획된 암컷들은 5~6마리의 새끼를 가진 임신상태이거나 난소에 성숙난포들과 황체를 가지고 있었다.

Keywords

References

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