Title page for etd-0111114-170900


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URN etd-0111114-170900
Author Lien-Han Kuo
Author's Email Address No Public.
Statistics This thesis had been viewed 5537 times. Download 906 times.
Department IAMPUT
Year 2013
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Statistical Analysis of Whistle and Ambient Noise of Summer in the Habitat of Indo-Pacific Humpback Dolphin (Sousa chinensis)
Date of Defense 2014-01-20
Page Count 99
Keyword
  • Statistical Analysis
  • Fishing Boat Noise
  • West Coast of Taiwan
  • Ambient Noise
  • Chinese White Dolphins
  • Whistle
  • Croaker
  • 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
    Advisory Committee
  • Hin-Kiu Mok - chair
  • Linus Y.S. Chiu - co-chair
  • Ruey-Chang Wei - advisor
  • Files
  • etd-0111114-170900.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2014-02-12

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