Title page for etd-0214108-144531


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URN etd-0214108-144531
Author Chiung-chen Cheng
Author's Email Address m922010025@student.nsysu.edu.tw
Statistics This thesis had been viewed 5341 times. Download 1296 times.
Department Biological Sciences
Year 2007
Semester 1
Degree Master
Type of Document
Language English
Title Factors influencing the visual detection in territorial male butterfly Hypolimnas bolina kezia
Date of Defense 2008-01-29
Page Count 50
Keyword
  • luminance contrast
  • Hypolimnas bolina
  • visual detection
  • visual angle hypothesis
  • territory defense
  • Abstract Early studies about territory defense of territorial male butterflies were focused on factors that may affect the outcome of contest. But rapid detection was so critical for territorial defense. The detection ability was correlated to visual system. Studies had focused on visual system such as the structure of eye optics and electrophysiology. However, it still existed one question about how do the owner detect intruder in the field. Some factors may affect the probability of detecting intruders from an owner, such as the distance, the size of the intruder, and background contrast. To determine what factor might affect detection ability of territorial male butterfly Hypolimnas bolina, two different sized butterfly models and four different luminance models were used to determine: 1. The reaction rate of the owner with differrent distances; 2. Test the detection ability at different relative position between intruders and owner (acute zone). 3. To test the visual angle hypothesis; 4. Test the luminance contrast effect. The results showed that the response rate decreased with distance but increased with model size. The owner had greater detection ability when the model was presented in the front rather than it on the side. Finally, the response rate was increased with model’s low luminance. Besides, if the model was darker than its background, the owner’s detection ability was greater. Previous studies indicated that a complex background may let the owner spend more time in detection. However, it was quite different with Hypolimnas bolina. In fact, the owner could quickly detect the model when the model was in a complex background, even there was without luminance contrast between the model and background.
    Advisory Committee
  • Michael Hin-Kiu Mok - chair
  • none - co-chair
  • Yu-Feng Hsu - co-chair
  • Hsueh-Wen Chang - advisor
  • Files
  • etd-0214108-144531.pdf
  • indicate in-campus access immediately and off_campus access in a year
    Date of Submission 2008-02-14

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