碩士 / 國立東華大學 / 海洋生物多樣性及演化研究所 / 99 / Otoliths are the calcium carbonate crystals in the inner ear of teleost fishes. Morphology of the otolith is species-specific and could be used to reflect the external morphology and ecological niche of fish. Focus on the Labridae, a common coral reef fish in Taiwan, otolith morphology was studied by a combined examination of outline parameters and sulcus characters. The relationship between otolith morphology and labrid habitats that were divided into the types of reef, sea grass and sand was also elucidated. According to the examination from 28 genera and 94 species labrids of Taiwan, the morphology of otolith was mostly elliptic or oval shape with varied margin sculpturing, poorly developed rostrum and the heterosulcoid sulcus. A significant difference among genera was found for the outline parameters (circularity, aspect ratio, roundness, form factor and ellipticity) and sulcus characters (collium height ratio, ostium length ratio, cauda length ratio and sulcus aspect ratio), indicating that the morphology was different and diversified among labrid otoliths. Principal component analysis indicated that the generic grouping was only viable by outline parameters but not for sulcus characters. This was not coincided with the conventional thought that the outline of otoliths is most useful for the order and family level identifications, while the sculpturing on the otolith medial side is diagnostic at the genus and species level. In addition, the results from outline parameters (aspect ratio, roundness and ellipticity) and sulcus characters (sulcus area ratio and cauda length ratio) indicated that otolith morphology of labrids from the reef habitat was usually elliptic with large sulcus area and longer cauda, compared to the round otoliths with smaller sulcus area and shorter cauda for the labrids from sand habitat.
| Identifer | oai:union.ndltd.org:TW/099NDHU5270038 |
| Date | January 2011 |
| Creators | Tzu-Yun Cheng, 程紫芸 |
| Contributors | Chih-Wei Chang, 張至維 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 82 |
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