Physiological responses of the jellyfish Cassiopea andromeda exposed to tributyltin

• Main Authors: Heng-Yu Tseng, 曾衡宇
• Other Authors: Pei-Jie Meng
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/k8az76

碩士 === 國立東華大學 === 海洋生物研究所 === 107 === In this study, we characterized the toxic effects of tributyltin on a symbiotic jellyfish Cassiopea andromeda with several physiological parameters, including growth rate, bell pulsation rate, symbiont PSⅡ activity (maximum quantum yield and effective quantum yield), zooxanthellae density and chlorophyll-a concentrations. Before the experiment, similar size of jellyfishes were selected, in which wet weight, bell diameter, proportion of oral arm wet weight, bell pulsation rate, PSⅡ maximum quantum yield, zooxanthellae density and chlorophyll-a concentrations were no significant differences in all groups. At 7 days of exposure, no significant differences in wet weight, bell diameter, proportion of oral arm wet weight, PSⅡ effective quantum yield, zooxanthellae density (in the whole body or between oral arm and bell tissue) and chlorophyll-a concentrations were found between treatments. When compared with the day 0, wet weight, PSⅡ maximum quantum yield and PSⅡ effective quantum yield reduced in all treatments. Negative growth were found in all treatments. Besides that, bell pulsation rates were lower in medium and high concentrations groups. Finally, TBT caused significant decreases in bell diameter in high concentrations groups. At 7 day of recovery, zooxanthellae density in bell tissue was significant lower than oral arm and PSⅡ maximum quantum yield were significant decreases in all treatment concentrations. Moreover, bell zooxanthellae density were significant decreases in high concentrations groups. Conclusively, we believe that jellyfish Cassiopea andromeda is sensitive to organotin pollutant exposure and can be used as an early warning indicator species.