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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Initiation of the spring phytoplankton increase in the Antarctic Polar Front Zone at 170 degrees W
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Initiation of the spring phytoplankton increase in the Antarctic Polar Front Zone at 170 degrees W

机译：在170度W的南极极地锋带春季浮游植物增加

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摘要

During austral summer 1997, satellite imagery revealed enhanced chlorophyll associated with the Antarctic Polar Front at 170 degreesW. Phytoplankton growth conditions during the early stages of the spring increase were investigated on the Antarctic Environment and Southern Ocean Process Study Survey I cruise using flow cytometry (FCM) and microscopy to characterize community biomass, composition and biological stratification and dilution experiments to estimate growth and grazing rates, Physical and biological measures showed a general shoaling of mixed layer depth from similar to 200 to < 100 m from late October to early November. Plankton assemblages on the southern side of the frontal jet (similar to0 degreesC waters) differed from those on the northern side (similar to2 degreesC) in enhanced relative importance of larger (> 20 mum) cells, greater contributions of diatoms and ciliates, and a twofold higher ratio of protistan grazers to photoautotrophs. Phytoplankton community growth rates from incubations at 10 and 23% of surface incident light showed good agreement between high performance liquid chromatography estimates of chlorophyll a (Chl a) (0.20 d(-1)) and FCM cell-based (0.21 d(-1))results. Fucoxanthin-based estimates for diatoms were 0.2-1 d(-1). Mean estimates of microzooplankton grazing from the three phytoplankton measures were 0.16, 0.12, and 0.11 d(-1), respectively. Heterotrophs typically consumed 40-100% of their body carbon per day and thus presumably grew at rates similar to phytoplankton. The low net rates of Chl a increase in shipboard bottle incubations (0.04 d(-1)) were consistent with the slow downstream accumulation of phytoplankton biomass (0.03 d(-1)) as measured with instrumented Lagrangian drifters through the month of November. Both were slightly less than the net rate estimates from SeaSoar surveys (0.05 d(-1)) because of the effects of pigment photoadaptation (bleaching) during this time of increasing light level and water column stratification. [References: 47]
机译：在1997年的夏季南方，卫星影像显示与南极极地锋在170度西偏处相关的叶绿素增强。使用流式细胞仪（FCM）和显微镜对南极环境和南部海洋过程研究调查I巡游中浮游植物生长条件的春季进行了调查，使用流式细胞仪（FCM）和显微镜来表征群落生物量，组成和生物分层以及稀释实验以估计生长和放牧从10月下旬到11月初，混合层深度从大约200 m降至<100 m。额叶喷流南侧（类似于0℃水域）的浮游生物组合与北侧（类似于2℃）中的浮游生物组合在较大（> 20毫米）细胞的相对重要性增强，硅藻和纤毛的更大贡献以及原生动物放牧者对光养生物的比率高两倍。通过在10％和23％的表面入射光下孵育而获得的浮游植物群落生长速率表明，高效液相色谱估计的叶绿素a（Chl a）（0.20 d（-1））与基于FCM细胞的（0.21 d（-1 ））结果。基于藻黄质的硅藻估计值为0.2-1 d（-1）。从这三种浮游植物的尺度上，对微浮游植物的放牧平均估计分别为0.16、0.12和0.11 d（-1）。异养类通常每天消耗其体内碳的40-100％，因此大概以类似于浮游植物的速度生长。船上瓶孵化中Chl a的低净增加率（0.04 d（-1））与通过仪器化的拉格朗日漂流器测量的11月份浮游植物生物量的下游下游累积缓慢（0.03 d（-1））一致。两者均略低于SeaSoar调查的净速率估计值（0.05 d（-1）），这是因为在增加光照水平和水柱分层的这段时间内，颜料的光适应性（漂白）会产生影响。 [参考：47]

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