南海北部海域Synechococcus和Prochlorococcus生长率和被摄食消亡率——变化范围及其与环境因子的关系  

Synechococcus and Prochlorococcus growth and mortality rates in the northern China Sea: range of variations and correlation with environmental factors

作　　者：蔡昱明[1] 宁修仁[2] 刘诚刚[3] 

机构地区：[1]中国海洋大学,青岛266003 [2]国家海洋局海洋生态系统与生物地球化学重点实验室,杭州310012 [3]国家海洋局第二海洋研究所,杭州310012

出　　处：《生态学报》2006年第7期2237-2246,共10页Acta Ecologica Sinica

基　　金：国家自然科学基金重点资助项目(90211021);国家自然科学基金资助项目(40506032)~~

摘　　要：2004年首次在南海北部海域使用选择性代谢抑制剂技术进行了Synechococcus和Prochlorococcus生长率和被摄食消亡率的研究.研究结果表明,ynechococcus高丰度值出现在次表层（15 m或20m）,位于温跃层之上,高生长率往往出现在丰度最大值水层上方;Prochlorococcus丰度在夏季出现次表层最大值,与温跃层深度基本一致,表层生长率高于真光层底部.Synechococcus真光层平均生长率为0.11～1.18 d^-1,被摄食消亡率为0.11～0.76 d^-1,分布格局均为从沿岸向外海方向升高.Prochlorococcus真光层平均生长率为0.23～0.49 d^-1,存在较明显的季节变化,夏季近岸略高于外海,而冬季的趋势正好相反;真光层平均被摄食消亡率为0.12～0.33 d^-1,冬夏两季均是近岸高于外海。温度、营养盐和光是影响Synechococcus生长率变化的重要因子.Synechococcus和Prochlorococcus丰度与群落生长率之间不存在相关关系,而与被摄食消亡率之间则存在显著的指数相关.根据Synechococcus和Prochlorococcus的生长率估算了它们的生产力及其对Pico-生产力的贡献.Studies on Synechococcus and Prochlorococcus growth and mortality rates using selective inhibitor technique for the first time were conducted in the northern South China Sea in 2004. The results showed that high abundance of Synechococcus appeared in the subsurface layer （ 15 m or 20 m）, above the thermochline. The high Synechococcus growth rate always occurred above the layer of its maximum abundance. Prochlorococcus abundance showed subsurface maximum in the summer according to the thermochline depth. Prochlorococcus growth rates in the surface were higher than that in the euphotic bottom. The range of Synechococcus euphotic-averaged growth and mortality rates were 0.11 ～ 1.18d^-1 and 0.11～0.76d^-1 , respectively. Both distribution patterns increased from the coast to the open ocean. The range of Prochlorococcus euphotic-averaged growth rates were 0.23～0.49d^-1. The rates showed obviously seasonal variation, i.e., slightly higher in coastal water than offshore in the summer and contrary trends in the winter. The range of Prochlorococcus euphotic-averaged mortality rates were 0.12～0.33d^-1 . The rates were higher in near shore than offshore in both summer and winter. Temperature, nutrients and light were important factors to influence Synechococcus growth rates. There were no relationship between abundances and community growth rates of Synechococcus and Prochlorococcus, but obvious exponential correlation with the mortality rates. Synechococcus and Prochlorococcus production and their contributions to Pico-production were estimated based on their growth rates.

关 键 词：SYNECHOCOCCUS PROCHLOROCOCCUS 丰度 生长率和被摄食消亡率 南海 

分 类 号：Q948.8[生物学—植物学]