碩士 / 國立臺灣大學 / 動物學研究所 / 98 / Morphology of fossil otoliths can be used for identification and thus can be used to reconstruct paleoenvironments. Lots of fossil otoliths have been found in Taiwan without identifications. However, studies of otolith morphology of extant fishes are rare in Taiwan. It is necessary to survey a large scale of local fish species with related otoliths prior to fossil otoliths analysis. The purpose of this study is to construct a otolith morphology database of living fishes, which can help collate with fossil otoliths, and finally, to reconstruct a possible paleoenvironment. Living fishes from Da-si fishing port have been collected from October 2008 to January 2010. The fish samples represent 23 orders, 100 families, and totally 230 species. Left sagitta are figured by stereomicroscope. The shapes of sagitta can be as a key to identify the fish at family level. Aspect ratio is also included in shape analysis, which is helpful in distinguishing more related species. Demersal taxa indicate sagitta with larger otolith length, whereas those living in the deep-sea ocean have the smaller otolith length.
Fossil teleostean otolith from Shulin, Taipei county, northern Taiwan was described for the first time. The outcrop was recovered along the Tahan river bank. Samples were collected from the Late Miocene to Early Pliocene Kueichulin Formation. Morphology comparison of the fossil otoliths with living ones showed that most of them belonged to family Sciaenidae. They were Larimichthys crocea, Larimichthys polyactis, Pennahia macrocephalus, Nibea albiflora and Nibea semifasciata. One specimen from Uranoscopidae, genus Uranoscopus was also included. All of the characteristics were drawn. Identifications of these fossil otoliths leaded us to conclude that the paleoenvironment of sample site was near shore marine with sand to sandy mud bottom, and temperate to subtropical condition.
| Identifer | oai:union.ndltd.org:TW/098NTU05312022 |
| Date | January 2010 |
| Creators | Chien-Hsiang Lin, 林千翔 |
| Contributors | Hsi-Jen Tao, 陶錫珍 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 207 |
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