Seasonal variability of phytoplankton biomass and composition in the major water masses of the Indian Ocean sector of the Southern Ocean.
Seasonal variability of phytoplankton biomass and composition in the major water masses of the Indian Ocean sector of the Southern Ocean.
复制标题
南大洋印度洋部分主要水团浮游植物生物量和组成的季节变化。
DOI：
10.1016/j.polar.2014.03.003
复制
发表时间：
2014
期刊：
影响因子：
1.8
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Iida T.;Odate;T.
浮游植物生物量和群落组成的长期变化在南大洋生态系统和海洋地球化学循环中具有重要意义。我们的目标是最终评估浮游植物组合在这一地区的十年尺度上的变化。然而，缺乏年度连续数据，长期数据集往往包括季节性变化。通过2011 - 2013年沿着110°E经线的多船观测，我们评估了南大洋印度洋区浮游植物丰度/组成的跨纬度季节变化。叶绿素浓度在亚南极带（40-50°S）为0.3-0.5 mg m− 3，在极锋带（50-60° S）为0.4-0.6 mg m− 3;两个带都以皮级浮游植物（<10 μm）为主，主要是附着植物。在南极分歧区（60-65°S），叶绿素浓度为0.6-0.8 mg m−3，主要是硅藻等纳米级浮游植物（>10 μm）。不同时期的叶绿素浓度和浮游植物群落组成在同一纬度带内是相同的，除了在45°S以北和60°S以南发生的一次小而明显的春季水华。这种小的季节性变化意味着南大洋的这一部分是监测气候变化长期影响的理想地点。
Long-term changes in phytoplankton biomass and community composition are important in the ecosystem and biogeochemical cycle in the Southern Ocean. We aim to ultimately evaluate changes in phytoplankton assemblages in this region on a decadal scale. However, yearly continuous data are lacking, and long-term datasets often include seasonal variability. We evaluated the seasonal changes in phytoplankton abundance/composition across latitudes in the Indian Ocean sector of the Southern Ocean via multi-ship observations along the 110°E meridian from 2011 to 2013. The chlorophyllaconcentration was 0.3–0.5 mg m−3in the Subantarctic Zone (40–50°S) and 0.4–0.6 mg m−3in the Polar Frontal Zone (50–60°S); pico-sized phytoplankton (<10 μm), mainly haptophytes, were dominant in both zones. In the Antarctic Divergence area (60–65°S), the chlorophyllaconcentration was 0.6–0.8 mg m−3, and nano-sized phytoplankton (>10 μm), mainly diatoms, dominated. Chlorophyllaconcentrations and phytoplankton community compositions were the same within a latitudinal zone at different times, except during a small but distinct spring bloom that occurred north of 45°S and south of 60°S. This small seasonal variation means that this part of the Southern Ocean is an ideal site to monitor the long-term effects of climate change.