Summer Phytoplankton Community Structure in the Kuroshio Current-Related Upwelling Northeast of Taiwan

臺灣東北部黑潮湧升流海域夏季浮游植物族群結構

李玉玲(Yuh-Ling Lee Chen)

《Terrestrial, Atmospheric and Oceanic Sciences》 3卷3期 (1992/09) Pp. 305-319

摘要

本研究於1990年夏季在台灣東北部海域，探討橫越黑潮鋒面之十九測站其葉綠素a濃度及浮游植物種類組成分佈。水錶至100公尺水深累計之葉綠素a濃度，8月爲8.63至41.80 mg.m^(-2)，9月爲8.88至94.70 mg•m^(-2)。鋒面附近測站呈現低水溫、高鹽度、高硝酸鹽濃度及高葉綠素a濃度之現象。葉綠素a濃度之垂直分佈，在湧升流附近測站，呈現濃度最大處較淺，約在0-25 m水深，其他測站則爲50-75 m。湧升流附近測站，矽藻顯著量多，八月份主要爲Skeletonemacostatum，九月份爲Thalassionema nitzschioids，此等現象與多量營養鹽之提供有關。

並列摘要

Observations of chlorophyll a concentration and phytoplankton assemblage were conducted during the summer of 1990 on 19 stations along two parallel transects across the Kuroshio Current front off the northeastern coast of Taiwan. The 0-100m seawater chlorophyll a content varied between 8.63 and 41.80mg•m^(-2) in August and between 8.88 and 94.70 mg•m^(-2) in September. High nitrate content, low temperature, high salinity and high chlorophyll a concentrations were observed at the stations along the front. The vertical distribution of chlorophyll a was characterized by a shallower subsurface maximum of between 0 and 25m in the station associated with the upwelling, while those of the non-upwelling stations were between 50-75m. Diatoms, Skeletonema costatum in August and Thalassionema nitzschioids in September, dominated the upwelled surface water because significant amounts of nutrients are supplied to surface of near-surface waters.