Age Determination by Tooth Wear and Histological Analysis of Seasonal Variation of Breeding in the Lesser White-Toothed Shrew, Crocidura suaveolens
1
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
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 56 litters or had the Graafian follicles and the corpus lutea in the ovary.
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 56 litters or had the Graafian follicles and the corpus lutea in the ovary.
참고문헌 (29)
- Andrews SM, "Cadmium in small mammals from grassland established on metalliferous mine waste", Environ Poll, 33, pp.153~162 (1984)
- Barid DD, "Reproduction in the Arctic shrew, Sorex arcticus", J Mammal, 64, pp.298~301 (1983)
- Bishop IR, "The ecological distribution of small mammals in the Channel Islands", Mammlia, 27, pp.99~100 (1963)
- Braham HW, "The effects of DDT on energetics of the short-tailed shrew, Blarina brevicauda", Bull Environ Contam Tox, 12, pp.32~37 (1974)
- Buckner CH, "The common shrew (Sorex araneus) as a predator of the winter moth (Operophtera brumata) near Oxford", England. Can Entomol, 101, pp.370~374 (1969)
- Carson KA, "Fine structure of the submandibular salivary gland of the Venomous short-tailed shrew, Blarina brevicauda (Insectivora: Soricidae)", European J Morph, 31, pp.111~128 (1993)
- Churchfield S, "Population dynamics and the seasonal fluctuations in numbers of the common shrew in Britain", Acta Theriol, 25, pp.415~424 (1980)
- Churchfield S, "Water and fat contents of British shrews and their role in the seasonal changes in body weight", J Zool Lond, 194, pp.165~173 (1981)
- Churchfield S, "natural history of shrews", pp.1~138 (1990), A & C black Ltd
- Eisenberg JF, "The mammalian radiations-an analysis of trends in evolution, adaptation and behavior", pp.119~136 (1981), University of Chicago Press
- Genoud M, "Energy requirements during reproductioin and reproductive effort in shrews (Soricidae)", J Zool Lond, 220, pp.41~60 (1990)
- Godfrey GK, "The breeding season of the lesser white-toothed shrew (Crocidura suaveolens Pallas, 1811) in Jersey", Bull Soc Jersiaise, 22, pp.195~196 (1987)
- Inoue T, "A new method for sexing young of the big-clawed shrew, Sorex unguiculatus (Dobson)", J Mamm Soc Japan, 13, pp.143~145 (1988)
- Inoue T, "Territory establishment of young bio-clawed shrew, Sorex unguiculatus (Dobson) (Insectivora, Soricidae)", Res Popul Ecol, 30, pp.83~93 (1988)
- Inoue T, "Sex difference in spatial distribution of the big-clawed shrew Sorex unguiculatus", Acta Theriol, 36, pp.229~237 (1991)
- Jeong SJ, "Spermatogenesis in three Korean shrews and notes on their phylogenetic significance", Korean Journal of Life Science, 11, pp.218~229 (2001)
- 정순정, "우수리땃쥐 Crocidura lasiura 악하선의 미세구조", 한국현미경학회지, 35(2), pp.1~13 (2005), 한국현미경학회
- 정순정, "작은땃쥐 Crocidura suaveolens와 우수리땃쥐 C. lasiura의이하선 선세포와 분비과립의 미세구조 비교", 한국현미경학회지, 35(4), pp.281~287 (2005), 한국현미경학회
- Jeong SJ, "Comparative fine structure of the epididymal spermatozoa from three Korean shrews with considerations on their phylogenetic relationships", Biocell, 30, pp.279~286 (2006)
- Jones JK Jr, "Review of the Insectivores of Korea", Univ Kansas Publ Mus Nat Hist, 9, pp.549~578 (1960)
- Korean Society of Systematic Zoology, "List of animals in Korea (excluding insects)", pp.299~ (1997), Academy Press
- Kress A, "Ultrastructural studies on oogenesis in the shrew (Crocidura russula): I. The prenatural follicle", J Morphol, 179, pp.59~71 (1984)
- Koh HS, "A study on age variation and secondary sexual dimorphism in morphometric characters of Korean rodents: I. An analysis on striped field mice, Apodemus agrarius coreae Thomas, from Cheongju", Korean J Zool, 26, pp.125~134 (1983)
- Mock OB, "The least shrew (Cryptotis parva) as a laboratory animal", Laboratory Animal Science, 32, pp.177~179 (1982)
- Pernetta JC, "Population ecology of British shrew in grassland", Acta Theriol, 22, pp.279~296 (1977)
- Robert RD, "Lead contamination of small mammals from metalliferous mines", Environ Poll, 15, pp.61~68 (1978)
- Rood JP, "Observations on population structure, reproduction and molt of the Sicilly shrew", J Mammal, 46, pp.426~433 (1965)
- Won PH, "Illustrated encyclopedia and fauna and flora of Korea. Vol. 7", pp.259~283 (1967), Ministry of Education
- Yoshino H, "Comparative study on the foraging habits on two species of Soricine shrews", Acta Theriol, 29, pp.35~43 (1984)