碩士 / 國立臺灣大學 / 海洋研究所 / 89 / Colonies of Sinularia gibberosa which have the function of cementing the coenenchymal spicules as spiculite in the bases of colonies, were collected from Nanwan Bay. Morphology of cells or tissues and the ultrastructure of spicules from top to base in the colonies were observed by transmission electron microscopy and scanning electron microscopy to confirm the model of spicule formation. The concentration, length and length-width ratio of coenenchymal spicules in different portions from the top and the base of colonies were measured and the relationships between the formation of spiculite and the spicule- related tissues and spicule in different portion were discussed.
The results of electron microscopic studies confirm that the model of spicule formation in this species is a transient intracellular step followed by a more complex and longer process of extracellular growth. During the intracellular growth, the vesicles with calcified crystals are formed by primary sclerocytes in a single cell, then enter the mesoglea and proceed to develop. Secondary sclerocytes deposit the calcium carbonate on the surface of the calcified crystals with multicellular ways. The developing crystals are combined as larger spicules. Other smaller crystals are also combined on the spicular surface to create complex tubercles. As a result, the tissue in the base of a colony shows some special granules or vesicles presented between spicules. This may be related to the bladed, botryoidal or pillar crystals that cement the spicules.
An analysis of spicular concentration shows significant differences between different portions of colonies and a trend of increasing downward to the base of colonies, suggesting the accumulation of coenenchymal spicules toward the bases of colonies. The analysis of spicular length shows that longer spicules (>2.0 mm) were mainly distributed on the top of colonies and the spicular length near the base of colonies were concentrated in the size class 1.0-1.5 mm. The length-width ratio of coenenchymal spicules also shows significant differences and decreases toward the base of colonies. It suggests that longer and thinner coenenchymal spicules are distributed near the top of colonies, while shorter and wider ones are near the base of colonies. The coenenchymal spicules might be absorbed and recalcified by secondary sclerocyte during growth of colonies.
| Identifer | oai:union.ndltd.org:TW/089NTU00279019 |
| Date | January 2001 |
| Creators | Hsiao, Yi-Chen, 蕭伊真 |
| Contributors | Jeng, M.S., Dai, C.F., 鄭明修, 戴昌鳳 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 48 |
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