| URN |
etd-0111114-170900 |
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| Author |
Lien-Han Kuo |
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| Author's Email Address |
No Public. |
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| Statistics |
This thesis had been viewed 5573 times. Download 944 times. |
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| Department |
IAMPUT |
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| Year |
2013 |
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| Semester |
1 |
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| Degree |
Master |
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| Type of Document |
|
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| Language |
zh-TW.Big5 Chinese |
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| Title |
Statistical Analysis of Whistle and Ambient Noise of Summer in the Habitat of Indo-Pacific Humpback Dolphin (Sousa chinensis) |
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| Date of Defense |
2014-01-20 |
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| Page Count |
99 |
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| Keyword |
Statistical Analysis
Fishing Boat Noise
West Coast of Taiwan
Ambient Noise
Chinese White Dolphins
Whistle
Croaker
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| Abstract |
Visual investigation of cetaceans are often limited by the weather, sea conditions and coastal water depth and other factors. In order to compenstate for the shortage of visual observation, this study used passive acoustics monitoring system to measure the whistle of Chinese White Dolphins and ambient noise in west coast of Taiwan. This study deployed two underwater acoustic recorders (SM2M) in New Huwei River of Yun-Lin coastal area (site YL) and Waisanding sandbar (site WS). Total of 68- and 45-days acoustic data were collected in YL and WS respectively. There are two parts of analysis according to recording data. One analysis explored the changes and trends of ambient noise, to understand the different of the two sites by spectrogram and spectrum, distribution of sound pressure level (SPL), as well as significant sound sources. Results shows that the low-frequency noise in WS is lower than YL due to the contributions of shipping and fishing noises. In two sites , ambient noise at 1 to 2 kHz contains periodic changes due to daily cycle of local croakers (Sciaenidae). Another analysis focused on the significant fishing boat noise, whose frequency range overlaps the whistle of Chinese White Dolphins. This analysis explored whether Chinese White Dolphins respond to passage of boats by using changes in total number of whistles before and after boat passing to understand potential variation of dolphin’s behavior. Results indicate a significant increase in the number of whistles after fishing boats passed. The increase in the number of whistles produced by dolphins after fishing boats pass, strongly suggests that the noise from transiting boats affects dolphin's group communication, so dolphins need to re-establish vocal contact with associates after the masking noise of the boat has passed |
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| Advisory Committee |
Hin-Kiu Mok - chair
Linus Y.S. Chiu - co-chair
Ruey-Chang Wei - advisor
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| Files |
Indicate in-campus at 3 year and off-campus access at 3 year. |
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| Date of Submission |
2014-02-12 |
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