Interactive effects of iron, irradiance and CO2 on Ross Sea phytoplankton
Interactive effects of iron, irradiance and CO2 on Ross Sea phytoplankton
复制标题
DOI：
10.1016/j.dsr.2009.10.013
复制
发表时间：
2010-03-01
影响因子：
2.4
通讯作者：
Hutchins, D. A.
中科院分区：
文献类型：
--
作者：
Feng, Y.;Hare, C. E.;Hutchins, D. A.
我们进行了一个析因的船上连续培养实验，以研究改变铁，辐照度和CO2对夏季浮游植物群落的交互作用，南极罗斯海。经过18天的连续培养，铁富集增加浮游植物生物量，营养盐下降，硅藻和棕囊藻丰度，和一些光合参数。高辐照度显著增加了南极棕囊藻菌落的数量，以及南极棕囊藻相对于硅藻的丰度。铁和光照对硅藻和南极原甲藻色素含量有显著的交互作用。Anaerotica菌落丰度和Si：N、Si：C和N：P比率。高CO2的主要影响是硅藻群落结构，有利于大型中心硅藻Chaetoceros lineola的小羽状物种新月形藻。中心的比例，羽状硅藻显着响应的变化，在所有三个变量单独的，所有可能的双向和三向组合。这些结果表明，光、铁和CO2的变化及其相互作用都在控制当今罗斯海浮游生物群落结构方面发挥着作用，在预测该地区未来可能的生物学和生物地球化学响应时需要考虑。(C)2009爱思唯尔有限公司保留所有权利。
We conducted a factorial shipboard continuous culture experiment to examine the interactive effects of altered iron, irradiance and CO2 on the summer phytoplankton community of the Ross Sea, Antarctica. After 18 days of continuous incubation, iron enrichment increased phytoplankton biomass, nutrient drawdown, diatom and Phaeocystis abundance, and some photosynthetic parameters. High irradiance significantly increased the number of Phaeocystis antarctica colonies, as well as P. antarctica abundance relative to diatoms. Iron and light had significant interactive effects on diatom and P. antarctica pigment concentrations. P. antarctica colony abundance, and Si:N, Si:C, and N:P ratios. The major influence of high CO2 was on diatom community structure, by favoring the large centric diatom Chaetoceros lineola over the small pennate species Cylindrotheca closterium. The ratio of centric to pennate diatoms was significantly responsive to changes in all three variables individually, and to all of their possible two- and three-way combinations. These results suggest that shifts in light, iron, and CO2 and their mutual interactions all play a role in controlling present day Ross Sea plankton community structure, and need to be considered when predicting the possible future responses of biology and biogeochemistry in this region. (C) 2009 Elsevier Ltd. All rights reserved.