A rising tide lifts all phytoplankton: Growth response of other phytoplankton taxa in diatom-dominated blooms
A rising tide lifts all phytoplankton: Growth response of other phytoplankton taxa in diatom-dominated blooms
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DOI：
10.1029/2006gb002726
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发表时间：
2006-12-09
影响因子：
5.2
通讯作者：
Hiscock, M. R.
中科院分区：
文献类型：
--
作者：
Barber, R. T.;Hiscock, M. R.
[ 1]主要由微微型浮游植物组成的海洋浮游植物组合对有利的生长条件的开始做出反应，并产生以硅藻为主的水华，其形成涉及硅藻和周围非硅藻群落的特征性生长和积累反应。与传统智慧相反，这两组浮游植物的增长率和绝对丰度增加，但环境nondiatom组合的生物量增加是适度的，特别是相比数量级或更多的硅藻生物量的增加。硅藻生物量的这种巨大比例增加助长了一种误解，即随着水华的成熟，硅藻通过继承来取代非硅藻分类群。然而，虽然非硅藻类群的相对丰度急剧下降，其绝对生物量适度增加，并在水华的picophytoplankton的特定增长率增加，在同一时间，原生动物放牧率也增加，举行picophytoplankton组合在水华到一个新的稳态生物量浓度。最近的证据无处不在的添加剂的反应模式在远洋硅藻水华来自在许多海洋地区的赤道上涌，涡动动力学，热带不稳定波，和海洋铁添加实验的观测，允许记录的生物反应迅速发病的有利的营养，微量营养素或光条件。硅藻对这些有利条件的反应是众所周知的，本报告提供了一个更准确的描述环境nondiatom类群的有利条件的快速发病的反应。现实的硅藻和非硅藻水华的生长动态的代表性，以改善预测未来的条件将如何影响控制碳循环和出口的过程。
[ 1] Oceanic phytoplankton assemblages composed predominantly of picophytoplankton respond to the onset of favorable growth conditions with diatom-dominated blooms, the formation of which involves characteristic growth and accumulation responses by both diatoms and the ambient nondiatom community. Contrary to conventional wisdom, both groups of phytoplankton increase in growth rates and absolute abundance, but the biomass increase of the ambient nondiatom assemblage is modest, especially compared to the order of magnitude or more increase of diatom biomass. This enormous proportional increase in diatom biomass has fostered the misconception that diatoms replace the nondiatom taxa by succession as the bloom matures. However, while the relative abundance of the nondiatom taxa decreases dramatically, their absolute biomass increases modestly and the specific growth rate of picophytoplankton in the bloom increases; at the same time, protistan grazing rate also increases, holding the picophytoplankton assemblage in the bloom to a new steady state biomass concentration. Recent evidence for the ubiquity of the additive response pattern in pelagic diatom blooms comes from observations in many oceanic regions where equatorial upwelling, eddy dynamics, tropical instability waves, and oceanic iron-addition experiments have allowed documentation of the biological response to rapid onset of favorable nutrient, micronutrient or light conditions. The response of diatoms to these favorable conditions is well known; this report offers a more accurate description of the response of the ambient nondiatom taxa to rapid onset of favorable conditions. Realistic representation of the growth dynamics of both the diatoms and nondiatoms in blooms is required to improve forecasting of how future conditions will affect processes that control carbon recycling and export.