Abstract
The effects of temperature on daily eclosion time and monthly eclosion days of the marine midge Pontomyia oceana were investigated. We changed temperature at different times on the eclosion day. The results show that P. oceana has started related metabolic processes at sunrise which lead to eclosion after sunset. Daily temperature cycles do not have concentrating effect on daily eclosion time. Two peaks of eclosion dates occurred from the same batch of fertilized eggs in the laboratory without cyclic environmental factors. High culturing temperature results in short interval (duration) between fertilization and eclosion, whereas more days are required at low temperature. The culturing temperature has a significant influence upon the numbers of P. oceana occurring in different eclosion peaks. High first/second peak ratio occurred at high temperatures whereas relatively more eclosed at the second peak at low temperature. The eclosion dates of offspring are not related to their parents with regard to the 2 peaks. There was an corresponding shift in eclosion days in eggs fertilized 2 days apart. It suggested that circasemilunar eclosion times were not caused by cues in the laboratory.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0615100-101335 |
| Date | 15 June 2000 |
| Creators | Lee, Pin-Hsien |
| Contributors | Keryea Soong |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0615100-101335 |
| Rights | unrestricted, Copyright information available at source archive |
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