Title page for etd-0217114-233316


[Back to Results | New Search]

URN etd-0217114-233316
Author Wen-Fu Hsin
Author's Email Address No Public.
Statistics This thesis had been viewed 5350 times. Download 589 times.
Department Marine Biotechnology and Resources
Year 2013
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title The relationships between environmental factors and seasonal distributions of the chaetognaths in the DongSha Atoll, South China Sea
Date of Defense 2014-01-20
Page Count 107
Keyword
  • species diversity
  • life history
  • predominant species
  • copepod
  • chaetognath
  • Abstract DongSha Atoll, locates in the northern South China Sea, is a semi-enclosed reef lagoon with two openings at the northwest and southwest parts. It usually influenced by the South China Sea Surface Current and climate changes, and thus, exhibited clear seasonal and spatial variations in hydrological conditions and plankton assemblages. The goals of this research are to investigate the species composition and distribution of the chaetognaths in the Atoll from February to October in 2011, and to evaluate their relationships with hydrological factors. In total, 29 chaetognath species, belonging to 13 genera and 3 families, were found in our samples, with an average abundance of 605 ± 241 ind./100m3. Flaccisagitta enflata, Serratosagitta pacifica, Ferosagitta robusta, Aidanosagitta regularis and Aidanosagitta delicata were the six predominant species and accounted for 74% of the total chaetognaths. Chaetognaths exhibited clear seasonal changes in abundance, higher in spring and lower in summer and fall. The results of multiple regression showed that, chaetognath abundance was positively correlated with copepod abundance and negatively with Chl a, species number was negatively correlated with temperature and Chl a, and positive with copepod abundance; species diversity was negatively correlated with Chl a. The predominant species were mostly found in Stage I of life history, especially in fall. We propose that the main maturation period of chaetognath was in winter and spring when individuals of mature stage were higher. Most predominant species had the largest average body lengths in spring. In conclusion, climate change and physical processes, such as monsoon, typhoon, tide, and internal wave, which together may affect the hydrological condition in DogshaAtoll, seem to be the key factors to interactively influence the seasonal and spatial distribution of chaetognaths.
    Advisory Committee
  • Chang-Tai Shih - chair
  • Kwee-Siong Tew - co-chair
  • Hung-yen Hsieh - co-chair
  • Wen-Tseng Lo - advisor
  • Files
  • etd-0217114-233316.pdf
  • Indicate in-campus at 1 year and off-campus access at 1 year.
    Date of Submission 2014-03-19

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys