碩士 / 國立臺灣大學 / 生態學與演化生物學研究所 / 105 / Anostracas face stress of reproduction within transient time period. Efficient mating system is necessary to prevent abortive hatching. Previous studies on anostracan mating behavior were few. In this study, I aim to estimate effect of 1) light and 2) mate swimming velocity on anostracan mating behavior. Hence, mating behavior of Branchinella kugenumaensis (Ishikawa, 1895) was observed and described. Mating behavior exhibited by focal males was compared between light and dark conditions, and among different type potential mates (receptive females, non-receptive females, and other males). I also measured swimming speeds of potential mates by videotaping and horizontal velocity measuring. The results demonstrated that mating behavior of B. kugenumaensis was consistent to general anostracan mating behavior. It was divided into orientation, station taking, amplexus, intromission, copulation, and disengagement. Light effect was significant in orientation, station taking, and amplexus, regardless of potential mate type. Focal males did not prefer any type mate in orientation but preferred receptive females in station taking and amplexus. All different type potential mates behaved similar swimming speed, wherein velocity significantly increasing during courtship than before courtship. In addition, amplexus occurred with significantly low potential mate velocities. Therefore, light does affect male B. kugenumaensis mating behavior. They may orient to every potential mates in orientation phase. Mate discrimination occurs in orientation phase. Amplexus was affected by velocities of potential mates, thus mate choice might exist in this mating system. I suggest that B. kugenumaensis fits general anostracan mating system, scramble-competition polygyny. Visual utilization and its mating system are adaptations to high population densities and transient reproduction durations.
| Identifer | oai:union.ndltd.org:TW/105NTU05110001 |
| Date | January 2017 |
| Creators | Li-Chung Tsai, 蔡立中 |
| Contributors | 周蓮香 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 79 |
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