Spatial and temporal distribution of pteropods in relation to hydrography in the waters around Taiwan

• Main Authors: Yung-Chih Chen, 陳勇志
• Other Authors: Wen-Tseng Lo
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/61975190040329698344

碩士 === 國立中山大學 === 海洋生物科技暨資源學系研究所 === 94 === Abstract The spatial and temporal changes in species composition and abundance of pteropods in relation to hydrography in the waters around Taiwan were investigated during the period from February 2003 to August 2004. In total, 26 species of pteropods belonging to 11 genera and 4 families were identified, with mean abundance of 75.87±11.39 inds/100m³, The abundance of pteropods exhibited noticeable seasonal changes, higher in summer and lower in winter. Higher abundance were always found in Taiwan Strait in our study area. The six most dominant species were Limacina inflata, Creseis acicula, C. clava, C. virgula, L. bulimoides and C. virgula var. conica in descending order. These species totally accounted for more than 88％ of the total pteropods. The composition of dominant species were similar among different seasons and hydrographic areas, but the order of dominance was different. Different dominant species showed different seasonal distribution patterns. The species number of pteropods in the waters around Taiwan showed no difference among seasons. There were 21 species found in winter, 22 species in spring and summer. The species number was higher in the waters of eastern Taiwan. The diversity index of pteropods in summer was significantly higher than that in spring and winter. The total abundance, species number, and diversity index of pteropods were significantly positively correlated to water temperature; only the species number was significantly positively correlated to salinity. The abundance of the six most dominant species showed different correlations with water temperature and salinity. The abundance of Creseis clava and C. virgula were significantly positively correlated with water temperature, but Limacina. bulimoides was negatively correlated. The abundance of L. inflata and L. bulimoides displayed significant positive correlation with salinity, but C. clava displayed negative correlation.