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研究生:李懿欣
研究生(外文):Yi-Hsin Lee
論文名稱:紐氏副盲鰻內耳之組織學及耳石型態之研究
論文名稱(外文):A histological study on the inner ear of the hagfish Paramyxine nelson with special reference to the statoconia morphology
指導教授:黃宏圖黃宏圖引用關係莫顯蕎莫顯蕎引用關係
指導教授(外文):Hung-Tu HuangHin-Kiu Mok
學位類別:碩士
校院名稱:國立中山大學
系所名稱:海洋生物研究所
學門:自然科學學門
學類:海洋科學學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:31
中文關鍵詞:內耳年齡盲鰻耳石
外文關鍵詞:agehagfishstatoconia
相關次數:
  • 被引用被引用:3
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  • 下載下載:28
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盲鰻屬無顎類, 其外型為鰻魚狀, 全身的骨骼由軟骨組成, 由於盲鰻無硬骨構造,其計算年齡的方式至今尚未可得。本研究以紐氏副盲鰻為材料, 檢視存在於其內耳的耳石是否可能成為為盲鰻定齡的依據。紐氏副盲鰻於台灣西南海域之部分區域有豐富的族群, 由於其嬌小的體型, 紐氏副盲鰻於此區並非商業性魚種, 這些特性使得其擁有成為研究盲鰻族群議題之模式魚種的潛力, 此為本研究選擇紐氏副盲鰻作為目標魚種的原因。
在本研究中, 49 尾紐氏副盲鰻 (10.2cm<體長<29.5cm)之內耳以掃描氏電子顯微鏡檢視其半規管內之細微構造, 並以組織切片檢視其組織構造。
紐氏副盲鰻的耳石位於位於半規管內的感覺細胞之上, 為多顆圓形的結晶構造, 其長徑範圍為1 µm ~ 26 µm (3.41± 0.29 µm), 大部分分布於4 µm to 8 µm的範圍之內, 長徑在此範圍之外的耳石(小於4 µm以及大於8 µm) 在所有被檢視樣本內皆可發現。耳石的長徑不與體長有正相關, 耳石的數量隨體長增長而增多, 顯示其耳石在盲鰻成長過程中持續生成, 此量雖與體長呈正相關, 其表現量在各體長組之間交疊, 無法有效的分離。耳石的長短徑比值(短徑/長徑)隨著在其長徑大於6μm之後降低, 推測耳石可能由圓形累積變大為橢圓形。由以上結果總結, 盲鰻耳石的直徑與數量並不適於作為盲鰻定齡的型值。
The agnathan hagfish is the plesiomorphic sister group of vertebrates. It is eel-liked, cartilaginous, and has only one semicircular canal. As hagfish have no hard structures that age determination remains unsuccessful. In the present work, we examined the statoconia in the inner ear of the hagfish Paramyxine nelsoni intense to explore it as a useful index in hagfish’s age determination.
P. nelsoni is quite abundant at some localities in the southwestern coast of Taiwan. Due to its smaller size, P. nelsoni is not a commercial species in this area. Little information on its populations is available in the literature. Consequently P. nelsoni is a potential model species for fisheries study of hagfish.
The statoconia of the P. nelsoni were deciphered from 49 specimens with body length ranging from 10.2cm to 29.5cm. The semicircular canals were examined using scanning electron microscope. Histological sections for the semicircular canals were also made for observation of cytological characters.
The masses of statoconia were located on the surface of the macular epithelium. The epithelium of macula was psudostratified columnar type, which was composed of hair cells and supporting cells. Diameters of the statoconia were ranged from 1 µm to 26 µm (3.41± 0.29 µm). Most of them were distributed in a narrow range from 4 µm to 8 µm.
Both small (<4μm) and large (>8μm) statoconia were observed in all size of Paramyxine nelsoni. The diameter of statoconia was not correlated with body length. Although the numbers of statoconia were increased with body length, it was not separate clearly between each body size. The shape index (short diameter/long diameter) was decreased when the long diameters of statoconia were larger than 6 µm. This result suggests that statoconia are produced to accumulate from round to ellipse throughout hagfish’s life span. In conclusion, both of the diameters and numbers of statoconia may not be appropriate index in age determination of hagfish.
Abstract (in Chinese) ------------------------------------------ 1
Abstract-------------------------------------------------------- 3
Introduction-----------------------------------------------------5
Material and methods-------------------------------------------- 7
Results---------------------------------------------------------10
Discussion------------------------------------------------------13
References------------------------------------------------------15
Tables and figures ---------------------------------------------16
Beckman, D. W. and Wilson, C. A. 1995. Seasonal timing of opaque zone formation in fish otoliths. In “Recent developments in fish otolith research”. Secor, D. H., Dean, J. M., Campana, S. E. (eds). University of South Carolina Press, Columbia. 27-43.Carlström, D. 1963. A crystalline study of vertebrate otolith. Biological Bulletin. 125: 441-463.Fernholm, B. 1998. Hagfish systematics. In “The Biology of Hagfishes”. JØrgensen, J. M., Lombolt, J. P., Weber, R. E., Malte, H. (eds). Chapman & Hall, London. 33-44.JØrgensen, J. M. 1998. Structure of the hagfish inner ear. In “The Biology of Hagfishes”. JØrgensen, J. M., Lombolt, J. P., Weber, R. E., Malte, H. (eds.). Chapman & Hall, London. 33-44.JØrgensen, J. M., Shichiri, M. and Geneser, F. A. 1998. Morphology of the hagfish inner ear. Acta Zoologica. 79: 251-256. Kuo, S. C. and Mok, H. K. 1999. Redescription of Paramyxine nelsoni (Myxinidae; Myxiniformes) and comparison with P. yangi from Taiwan. Zoological Studies. 38 (1): 89-94.Lowenstein, O. and Thornhill, R. A. 1970. The labyrinth of Myxine: anatomy, ultrastructure and electrophysiology. Proceedings of the Royal Society of London. Series B. 176: 21-42.McVean, A. 1991. The semicircular canals of the hagfish Myxine glutinosa. Journal of Zoology: proceedings of the Zoological Society of London. 224: 213-222.Mok, H. K. and Chen, Y. W. 2001. Distribution of hagfish (Myxinidae: Myxiniformes) in Taiwan. Zoological Studies. 40(3): 233-239. O’Donvan, O. and Tully, O. 1996. Lipofuscin (age pigment) as an index of crustaceanage: correlation with age, temperature and body size in cultured juvenile Homarus gammarus L. Journal of Experimental Marine Biology and Ecology.207: 1-14.
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