• Title/Summary/Keyword: Crocidura suaveolens

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Comparative Ultrastructure of Secretory Granules of the Submandibular Gland in the Korean Spider Shrew, Sorex caecutiens, the Lesser White-toothed Shrew, Crocidura suaveolens and the Big White-toothed Shrew, Crocidura lasiura

  • Jeong, Soon-Jeong;Bae, Chun Sik;Lee, Hye-Yon;Choi, Baik-Dong;Yoon, Myung-Hee;Jeong, Moon-Jin
    • Applied Microscopy
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    • v.42 no.4
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    • pp.186-193
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    • 2012
  • The ultrastructure of the secretory granules of the submandibular gland was examined in the Korean spider shrew, Sorex caecutiens, lesser white-toothed shrew, Crocidura suaveolens and big white-toothed shrew, C. lasiura. The mucous and serous acinar granules of S. caecutiens with a border of the lucid corona differed from those of C. suaveolens and C. lasiurar with a dense lateral border. The mucous acinar granules of C. lasiura with several bands producing a variety of patterns in the matrix were similar to those of C. suaveolens. The serous acinar granules of C. lasiura had a homogenous pale center surrounded by minute dense specks or had an unusual substructure showing a geometric pattern according to the inclusions in the pale matrix of the granules. This is the first report of an unusual substructure showing a geometric pattern of the serous acinar granules of C. lasiura. The myelin-like body was observed in the granular duct cell of the three species of shrew. The myelin-like body of S. caecutiens with layers of unit membranes was different from that of C. suaveolens and C. lasiura with paired membranes. Therefore, the layers composing of the paired membranes of the myelin-like body might be one of the characteristics of Crocidura.

Species Distribution and Characteristics of Wild Mice in Mt. Keumwon Recreational Forests (금원산 자연휴양림 내 들쥐류의 종 분포 및 특성)

  • Lee, Chong Kyu;Kang, Young Min
    • Journal of Forest and Environmental Science
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    • v.30 no.1
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    • pp.161-166
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    • 2014
  • To provide basic information for wildlife management, we investigated the distribution and ecology of wild mice in Mt. Keumwon recreational forests. The trapped wild mice were a total of 4 species such as Eothenomys regulus, Apodemus speciosus peninsulae, Apodemus agarius, and Crocidura suaveolens. A total of 79 individuals from four species were trapped. Number of Eothenomys regulus was the highest as 41 individuals followed by Apodemus speciosus peninsulae of 31 individuals, Apodemus agarius of 4 individuals, and Crocidura suaveolens of 4 individuals. Depending on forest type, 51 individuals were captured in broad-leaved forests, whereas 28 individuals were captured in coniferous forests. Average weight of the trapped Eothenomys regulus, Apodemus speciosus peninsulae, Apodemus agarius, and Crocidura suaveolens was 37.13 g, 36.29 g, 31.25 g, and 15 g, respectively. Among the trapped wild mice, vole which has the largest head and ears were Eothenomys regulus and vole which has the longest tail was Apodemus speciosus peninsulae and Apodemus agarius (p<0.5). This study might be valuable to control and predict some damages related to wild mice in Mt. Keumwon for protecting forest trees.

Comparative Ultrastructure of the Acinar Cell and Secretory Granules of Parotid Salivary Gland in the Lesser White-toothed Shrew, Crocidura suaveolens and the Big White-toothed Shrew, C. lasiura (작은땃쥐 Crocidura suaveolens와 우수리땃쥐 C. lasiura의 이하선 선세포와 분비과립의 미세구조 비교)

  • Jeong, Soon-Jeong;Jeong, Moon-Jin
    • Applied Microscopy
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    • v.35 no.4
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    • pp.91-97
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    • 2005
  • The acinar cells and secretory granules of the parotid salivary gland were examined in the lesser white toothed shrew, Crocidura suaveolens and the big white-toothed shrew, C. lasiura. The parotid gland of both species were a serous gland having only one kind of serous acinar cells, and had conventional arrangement of acini and intercalated, granular and striated ducts. In case of C. suaveolens, serous acinar cells had well developed rER, prominent Golgi complex, several large mitochondria and abundant moderate dense secretory granules with various stages of the maturing or fusing process. Immature acinar secretory granules were only or mainly filled with fine strong dense specks and had an indistinct limiting membrane, and mature granules were filled with homogeneous pale large round center and had fine strong dense specks at the periphery of the homogeneous pale center and a distinct limiting membrane. In case of C. lasiula, serous acinar cells had well developed rER, prominent Golgi complex, several large mitochondria and abundant dense secretory granules with maturing or fusing process. Immature acinar secretory granules were only filled with pale rough specks and had an indistinct limiting membrane, and mature granules were only filled with rough dense specks and had a distinct limiting membrane. Eventually The acinar secretory granules of C. suaveolens were seen moderate at the light and ultrastuctural level, those of C. lasiura were strong dense at the light microscopic level and dense at the ultrastructural level.

Ultrastructure of the Submandibular Gland in the Lesser White-Toothed Shrew, Crocidura suaveolens (작은땃쥐 Crocidura suaveolens 악하선의 미세구조)

  • Jeong, Soon-Jeong;Jeong, Moon-Jin;Kim, Do-Kyung;Kook, Joong-Ki;Kim, Heung-Joong;Yoon, Myung-Hee;Park, Joo-Cheol
    • Applied Microscopy
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    • v.35 no.2
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    • pp.65-72
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    • 2005
  • The ultrastructure of submandibular gland was examined in the lesser white-toothed shrew, Crocidura suaveolens. The submandibular gland of C. suaveolens was a mixed gland composed of serous and mucous acinar cells. Secretory granules from the acini were discharged through the salivary ducts into the oral cavity. Serous and mucous acinar cells had well developed rough endoplasmic reticulum and mitochondria and large amount of granules. In case of serous acinar granules, an immature granule was formless and had only dense specks, and a matured granule was a complete round type delimiting by a single membrane and had a homogeneous dense center with dense specks on the border. In case of mucous acinar granules, while an immature granule was a round type and had an only homogeneous matrix and an indistinct limiting membrane, a mature granule was an even round type having a variety of pattern with several dense bands into the homogeneous matrix and had a distinct membrane. Therefore, a mature mucous acinar granule of C. suaveolens was not only distinct from those of the other mammalian species to have a variety of pattern but also from those of C. lasiura to have an even round type. A great serous-like secretory granules and Myelin-like body were observed in the cytoplasm and lumen of granular duct cells. Myelin-like body, a characteristic structure only reported in salivary gland of three shrews, was discharged from secretory cell into lumen by the manner of exocytosis which has little differences from discharging manner of secretory granules.

Spermatogenesis in three Korean shrews and notes on their phylogenetic significance (한국산 땃쥐류 3종의 정장형성 및 이들의 계통 유연관계에 대한 소고찰)

  • 정순정;윤명희
    • Journal of Life Science
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    • v.11 no.3
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    • pp.218-229
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    • 2001
  • The cycle of the seminiferous epithelium and spermiogenesis in three species if the genus Crocidura, the lesser white-toothed shrew, C. suaveolens, the Japanese white-toothed shrew, C. dsinezumi and the big(=Ussuri) white-toothed shrew C. lasiura, in the breeding season were studied with light and electron microscopes. The three species examined are distinguished from each other in the morphology of the seminiferous epithelium and the spermiogenesis, suggesting that these morphological characteristics are useful for the identification of the species. C. dsinezumi and C. lasiura, however, share many characteristics which are not common in C. suaveolens, as follows: In both species, 1) the cycle of the seminiferous epithelium is composed of 10 stages against 11 stages in C. suaveloens; 2) the earliest intermediated type spermatogonia is observed at stage I against stage III in C. suaveolens; 3) the spermatids of step 5 is observed during the stages V-VI against stages V-VII in C. suaveolens; 4) the acrosomal extension occurs during the stages VIII-X against tages IX-XI in C. suaveolens; 5) the condensation of the nucleus occurs simultaneously whereas it begins from the middle and along the nuclear membrane in C. suaveolens; 6) the capitular length in acrosome phase is shorter(about 2/3 of the diameter of the proximal centriole) than in C. suaveolens(longer than the diameter of proximal centriole; 7) length of the post nuclear cap is shorter(less than a half of the nucleus) than in C. suaveolens(about a half on the nucleus). Hudging from the similarities in the spermatogenesis in C. dsinezumi and C. lasiura, the relationship between them seems to be close compared to those with C. suaveolens.

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Comparative Tooth Morphology and Qualitative Analysis on the Enamel Surface using Energy Dispersive X-ray Spectroscopy in the White-Toothed Shrew Crocidura lasiura and C. suaveolens and the Red-Toothed Shrew Sorex caecutiens from Korea (한국 땃쥐속 우수리땃쥐 Crocidura lasiura와 작은땃쥐 C. suaveolens, 뒤쥐속 뒤쥐 Sorex caecutiens의 치아형태와 Energy Dispersive X-ray Spectroscopy를 이용한 법랑질 표면의 정성적 분석 비교)

  • Jeong, Soon-Jeong
    • Journal of dental hygiene science
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    • v.13 no.2
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    • pp.203-212
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    • 2013
  • The tooth morphology and qualitative mineral contents on enamel surface using energy dispersive X-ray spectroscopy, (EDX) were examined in the white-toothed shrew (genus Crocidura ) Crocidura lasiura and C. suaveolens and the red-toothed shrew (genus Sorex) Sorex caecutiens. In the case of C. lasiura and C. suaveolens, dental formula was found I 3/1 C1/1 P1/1 M3/3=28. The upper 1st and 2nd molars had an unequal W-shape formed by 5 cusps on the crown. The 3rd molar was found one-third the size of those of 1st and 2nd molars. The upper 1st incisor had two different sized hook-shapes and the lower 1st incisor was even. In the case of S. caecutiens, dental formula was found to be I3/1 C1/1 P3/1 M3/3=32. The upper 1st and 2nd molars had an equal W-shape on crown. The upper 3rd molar was half the size of those of the other molars. The upper 1st incisor possessed two similar sized hook-shapes and the lower 1st incisor had an uneven and serrated form. A comparison with the dental and cranial measurements revealed C. lasiura to be the largest of the three species (p<0.001) and C. suaveolens and S. caecutiens were similar in size (p>0.05). A qualitative analysis of mineral contents on enamel surface of the lower 1st incisor and lower 1st molar using EDX revealed C, O, P, Ca and Cu in all specimens and Pb was detected in several enamel specimens. No significant differences in the mineral contents (% weight) were observed among the three species (p>0.05). Fe was only detected on enamel surface of S. caecutiens with red pigmented teeth. Therefore, Fe is responsible for the red tip of the teeth. These results suggest that tooth morphological characteristics including the color of the tooth tip might be used as the key classifying species belonging to Crocidura and Sorex.

Studies on the Ecology of Field Mice in Mt. Chuisuh (취서산(鷲棲山) 들쥐류(類)의 생태(生態)에 관한 연구(硏究))

  • Nam, Jung Chil
    • Journal of Korean Society of Forest Science
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    • v.90 no.6
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    • pp.707-716
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    • 2001
  • This study was conducted four ecological survey of field mice of Mt. Chuisuh in Yangsan City, Kyungnam from June, 2000 to March, 2001 for the understanding of field mice damage to forest. The results are obtained as follows. 1. The species of field mice collected were Apodemus agrarius, Apodemus peninsulae and Eothenomys regulus, and Crocidura suaveolens of insectvore. 2. The total collecting rate were 8.1% collected 61 individuals of field mice from 758 trap. 3. The rate among the 61 field mice collected were 45.9% in Apodemus agrarius, 29.5% in Eothenomys regulus, 19.7% in Apodemus peninsulae, and 4.9% in Crocidura suaveolens. 4. The constitution of weight of field mice was 16-51.9g in Apodemus agrarius, 12-25.9g in Apodemus peninsulae, 16-45.9g in Eothenomys regulus, and 12-15.9g in Crocidura suaveolens. 5. The sex ratio of field mice was 48.0% : 52.0% in Apodemus agrarius, 50.0% : 50.0% in Apodemus peninsulae, 55.6% : 44.4% in Eothenomys regulus, and 66.7% : 33.3% in Crocidura suaveolens. 6. The average body lengh was 104.33mm in Eothenomys regulus, 96.04mm in Apodemus agrarius, 94.50mm in Apodemus peninsulae, and 76.33mm in Crocidura suaveolens. 7. The average tail lengh was 92.75mm in Apodemus peninsulae, 80.65mm in Apodemus agrarius, 41.0mm in Crocidura suaveolens, and 40.33mm in Eothenomys regulus. 8. The breeding period of field mice in Mt. Chuisuh presumes from about the early of March to end of October. Specially, The Eothenomys regulus was ascertained the breeding period in December, discovered first time in korea through this experimental study. 9. The average litter size of field mice was 4.5 in Apodemus agrarius, 4.7 in Apodemus peninsulae, and 3.4 in Eothenomys regulus.

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Ultrastructure of epididymal spermatozoa in three Korean shrews (한국산 땃쥐류 3종에 대한 부정소 미부 정자의 미세구조)

  • 윤명희;정순정
    • Journal of Life Science
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    • v.11 no.1
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    • pp.54-61
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    • 2001
  • The comparative morphology of epididymal spermatozoa in the lesser white-toothed shrew, Crocidura suaveolens, the Japanese white-toothed shrew, C. dsinezumi and the big white-toothed shrew, C. lasiura, belonging to the subfamily Crocidurinae was studied with the light and electron microscopes. The spermatozoa of C. lasiura and C. dsinezumi were characterized by the large acrosome, serrated inner acrosomal membrane, common apical body and fistulous proximal centriole with slightly dense electron granular materials, which are the charateristics of the Crocidurinae. The C. suaveolens, however, is distinguished from the two species mentioned above in the sperm morphology. That is, the spermatozoa possess not only the charateristic of the Crocidurinae such aw the large acrosome, but also those of the Soricinae, i.e. the smooth inner acrosomal membrane, wavy, finger-like and electron-dense apical body, and the solid proximal centriole filled with electron-dense materials. The results suggest that C. suaveolens has conserved characteristics of the Soricinae.

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Small Mammals in Relation to Korean Hemorrhagic Fever a preliminary report (한국출혈열과 관계되는 소포유동물에 대하여(예보))

  • 애드윈엘타이슨
    • The Korean Journal of Zoology
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    • v.10 no.1
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    • pp.35-38
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    • 1967
  • A cursory study of small mammals on and near five military compounds where Korean Hemorrhagic Fever patients had been reported indicated that Mus musculus was more closely associated with man than all other mammals ccmbined. Therefore, there is a greater probability that Mus musculus is associated with the disease than any other species. Rattus rattus was common in villages and farm houses but was not abundant on military compounds. The two shrews, Crocidura lasiura and C. suaνeolens were uncommon, but they were often found in close association with hemorrhagic fever patients. Other small mammals were rare or lived in such places as to come in contact with man rarely.

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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;Yoon, Myung-Hee;Kim, Sook-Hyang;Ham, Joo-Hyun;Lim, Do-Seon;Choi, Baik-Dong;Park, Jin-Ju;Jeong, Moon-Jin
    • Applied Microscopy
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    • v.40 no.3
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    • pp.125-132
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    • 2010
  • 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.