碩士 / 國立臺灣大學 / 海洋研究所 / 101 / Early life history stage of deep sea demersal fishes is crucial to population survival. Population and community studies had reported that deep sea demersal species ususally have ontogenetic vertical migration (OVM) which they change their inhabiting depth in order to survive and develop. Fish otolith microstructure has been used to determine the ages of fish and life history stage. And stable isotope composition of oxygen and carbon (δ13C, δ18O) within calcium carbonates can record the environmental signals and physiological status of fish. Fish samples were collected in northeastern and southwestern Taiwan, north and east continental slope of South China Sea by research vessel (depth > 500 m), and from fish collected at DaiShi harbor (depth< 500 m). In this study, we investigate the ontogenetic vertical life histories of 17 species within 8 families of deep sea demersal fishes in autecological perspective, by analyzing otolith microstructure and stable isotope composition.
The results suggest that δ13C and δ18O reflect metabolism and environmental temperature respectively, prove individual to have OVM, and provide the habiting depth of early life stage of species. Whether early life history takes OVM or not is determined by reproductive tactics. (e.g., slickheads with large demersal egg with sufficient nutrient and development will not take OVM.) In settlement stage, most of the species take OVM unrelated to reproductive tactics and this is correlated to energy trade-off by the judge of δ13C-δ18O correlation, which suggests that OVM is a common life strategy in deep sea demersal fishes. Adult’s habitat depth may affect the distance and patterns of OVM. (e.g. deeper cusk eels migrate more and depend most of the migration on pelagic juvenile.) Generally, OVM distance increases with increasing habiting depth.
Life history patterns of deep sea demersal fishes varied among taxonomy, reproductive tactics and habitat depth, displaying different adaptations or diverse life strategies to the deep sea environment, indicating the importance of OVM.
| Identifer | oai:union.ndltd.org:TW/101NTU05279024 |
| Date | January 2013 |
| Creators | En-Yu Liu, 劉恩諭 |
| Contributors | Jen-Chieh Shiao, 蕭仁傑 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 101 |
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