碩士 / 國立中山大學 / 海洋生物學系 / 85 / This investigation studied the emergence time of the marine midges Pontomyia oceana by culturing larvae in different light-dark cycles in the laboratory. There was an unsynchronized emergence within a day under the treatments of continuous light or continuous darkness, but synchronized emergence was observed when treated by 24 hour light-dark cycles with daylength from 10 to 14 hours without tidal simulation. The mean eclosion time within a day was correlated with the time of light was turned on and off. The variation of emergence time within a day in LD 10:14 was significantly greaterthanthevariationinLD 14:10. The influence of light-dark cycles in the pupal stage was greater than that in the larval stage on daily eclosion time. It is suggested that both sunrise and sunset in the field were the proximate factors of synchronized emergence in this marine midge. The results of this study could explain the different timings of emergence between summer and winter collections in the field.
| Identifer | oai:union.ndltd.org:TW/085NSYS3270005 |
| Date | January 1997 |
| Creators | Cao, Jun-Ren, 曹俊仁 |
| Contributors | Soong,Ker-Yea, 宋克義 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 56 |
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