碩士 / 國立成功大學 / 生物學系碩博士班 / 90 / This study investigated heat tolerance and its plasticity in two altitudinal populations of larval Bufo bankorensis. In the first chapter, I compare survival, developmental rate, and critical thermal maximum (CTmax) of embryos and larvae of Bufo bankorensis from two altitudes at different temperatures. In the second chapter, I examine the rates of CTmax change upon thermal acclimation and the influence of embryonic thermal history on CTmax in larval Bufo bankorensis. Although embryonic survival rates of Alishan and Nanjenshan populations both were very high at 30 °C, the larval survival rates of the two populations were very low suggesting this species is intolerant to high temperatures. At 15 °C, survival rates of embryos and larvae of Alishan population were higher than those of Nanjenshan population, indicating the Nanjenshan population is poor in cold tolerance. Larval developmental rate increased, while larval period decreased, with increasing temperature. Larval developmental rate of Alishan population was slower than that of Nanjenshan population at low temperatures (15 and 20 °C), but the opposite was observed at high temperature (30 °C), suggesting larval development of Alishan population is more sensitive to temperature change. The CTmax between the two altitudinal populations of larval Bufo bankorensis was affected by acclimation temperatures and developmental stages, but it was not influenced by altitudinal populations. CTmax required approximately 2-3 days to stabilize at the new level in heating from 15 to 25 °C, but it required 14 days to stabilize in cooling from 25 to 15 °C. Thermal experience during embryonic period will affect CTmax in the larval stages, however, this effect is reversible. These results suggest that the two altitudinal populations of Bufo bankorensis may have differentiated genetically in order to adapt to their thermal environments.
| Identifer | oai:union.ndltd.org:TW/090NCKU5112003 |
| Date | January 2002 |
| Creators | Li-Wen Chang, 張麗文 |
| Contributors | Ping-Chun Hou, 侯平君 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
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