Phytoplankton competition during the spring bloom in four Plankton Functional Type Models
Phytoplankton competition during the spring bloom in four Plankton Functional Type Models
复制标题
四种浮游生物功能型模型春季开花期间浮游植物的竞争
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Doney
中科院分区：
文献类型：
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作者：
T. Hashioka;M. Vogt;Y. Yamanaka;Corinne Le Quéré;E. Buitenhuis;M. N. Aita;S. Alvain;L. Bopp;T. Hirata;I. Lima;S. Sailley;S. Doney
我们在四种最先进的浮游生物功能类型 (PFT) 模型：PISCES、NEMURO、PlankTOM5 和 CCSM-BEC 中研究了春季开花期间浮游植物竞争的机制，这是低营养级生态系统中最引人注目的季节性事件之一。特别是，我们研究了不同生态生理过程对群落结构决定的相对重要性，重点关注自下而上和自上而下的控制。模型合理地再现了观测到的浮游植物生物量的全球分布和季节变化。在所有模型中，硅藻相对于浮游植物总生物量的比例随着春季水华的强度而增加。然而，尽管当前的 PFT 模型使用相同类型的参数化来代表生态生理过程，但模型之间的控制机制有所不同。随着水华程度的增加，硅藻的百分比呈增加趋势，主要是由于与纳米浮游植物（自下而上的对照）相比，硅藻生长对营养的依赖性更强。最大生长速率的差异在 NEMURO 和 PlankTOM5 中起着重要作用，并决定了水华期间硅藻百分比的绝对值。在CCSM-BEC中，生长的光依赖性在北大西洋和南大洋发挥着重要作用。然而，浮游动物的放牧压力（自上而下的控制）极大地促进了双鱼座和 CCSM-BEC 中硅藻的主导地位。 PlankTOM5中硅藻百分比的区域差异主要是由自上而下的控制决定的。这些机制上的差异表明，即使当前的生态系统以相似的置信度再现，海洋生态系统对气候变化的响应在不同模型中也可能存在显着差异。为了进一步了解浮游生物的竞争以及预测海洋生态系统的未来变化，了解PFT之间自下而上和自上而下控制下每个生理速率和生活史速率的相对差异非常重要。
We investigated the mechanisms of phytoplankton competition during the spring bloom, one of the most dramatic seasonal events in lower-trophic-level ecosystems, in four state-of-the-art plankton functional type (PFT) models: PISCES, NEMURO, PlankTOM5 and CCSM-BEC. In particular, we investigated the relative importance of different ecophysiological processes on the determination of the community structure, focusing both on the bottom-up and the top-down controls. The models reasonably reproduced the observed global distribution and seasonal variation of phytoplankton biomass. The fraction of diatoms with respect to the total phytoplankton biomass increases with the magnitude of the spring bloom in all models. However, the governing mechanisms differ between models, despite the fact that current PFT models represent ecophysiological processes using the same types of parameterizations. The increasing trend in the percentage of diatoms with increasing bloom magnitude is mainly caused by a stronger nutrient dependence of diatom growth compared to nanophytoplankton (bottom-up control). The difference in the maximum growth rate plays an important role in NEMURO and PlankTOM5 and determines the absolute values of the percentage of diatoms during the bloom. In CCSM-BEC, the light dependency of growth plays an important role in the North Atlantic and the Southern Ocean. The grazing pressure by zooplankton (top-down control), however, strongly contributes to the dominance of diatoms in PISCES and CCSM-BEC. The regional differences in the percentage of diatoms in PlankTOM5 are mainly determined by top-down control. These differences in the mechanisms suggest that the response of marine ecosystems to climate change could significantly differ among models, even if the present-day ecosystem is reproduced to a similar degree of confidence. For further understanding of plankton competition and for the prediction of future change in marine ecosystems, it is important to understand the relative differences in each physiological rate and life history rate in the bottom-up and the top-down controls between PFTs.
未来气候下全球海洋生物地球化学动力学对生态系统结构的敏感性
影响因子：
5.2
作者：
Manizza M
通讯作者：
Manizza M