Title page for etd-0722117-141304


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URN etd-0722117-141304
Author Yi-ning Ho
Author's Email Address No Public.
Statistics This thesis had been viewed 5389 times. Download 263 times.
Department Department of Oceanography
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Larval fish assemblages in the lagoon of Dongsha Atoll
Date of Defense 2017-07-17
Page Count 117
Keyword
  • Identification key
  • Community structure
  • Fish larvae
  • Dongsha Atoll
  • Abstract Larvae are one of the early stages of fish development. Larvae composition and community structure of fish are important information to infer breeding season and the pattern of assemblage, providing reference for fishery management and marine ecosystem protection. In this study, fish larvae were collected monthly in order to understand the community structure of larvae in the Dongsha Atoll. A key to fish families that are abundant in Dongsha is provided and primer sets for molecular identifications are designated for discrimination to families with similar larvae morphology. From November 2015 to October 2016, samples of five sampling sites of Dongsha Atoll and one sampling sites in the small lagoon were collected using the North Pacific Zooplankton standard net (300 µm) and trawling for 10 minutes at the surface water. Since July of 2016 till October of 2016, additional trawlings at five-meter depth were conducted. In total, larvae of 32 families were indentified. The average abundance (including surface water and five-meter depth) is 238.0 ind./1000 m3. The average abundance of surface water is 110.6 ind./1000 m3, and the average abundance of five-meter depth is 513.8 ind./1000 m3. The average abundance at five-meter depth of South Channel site was higher than the other sites (231.5 ind./1000m3). The surface water of East site was lower than the average (22.0 ind./1000 m3). The dominant species were Pomacentridae (84.6 ind./1000 m3), Gobiidae (81.0 ind./1000 m3), alevin (20.3 ind./1000 m3), Blennidae (11.4 ind./1000 m3), Apogonidae (9.7 ind./1000 m3), Eleotridae (5.1 ind./1000 m3). The peaks of the reproductive season are April、August and September. The difference of larvae assemblage among the whole year doesn’t show obvious grouping. ANOSIM detected month (R=0.275)、season (R=0.106)、site (R=0.001) and water layer (R=0.131) were not significant. The designated primer sets can successfully determine four families except for the Gobiidae by gel electrophoresis.
    Advisory Committee
  • Meng-Hsien Chen - chair
  • Chih-Wei Chang - co-chair
  • Te-Yu Liao - advisor
  • Chiee-Young Chen - advisor
  • Files
  • etd-0722117-141304.pdf
  • indicate access worldwide
    Date of Submission 2017-08-24

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