Phytoplankton Biogeography and Community Stability in the Ocean
Phytoplankton Biogeography and Community Stability in the Ocean
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DOI：
10.1371/journal.pone.0010037
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发表时间：
2010-04-02
期刊：
影响因子：
3.7
通讯作者：
Falkowski, Paul G.
中科院分区：
文献类型：
--
作者：
Cermeno, Pedro;de Vargas, Colomban;Falkowski, Paul G.
背景资料：尽管巨大的环境变化与更新世的冰川/间冰期气候有关，但我们最近表明，海洋硅藻群落在过去150万年中通过逐渐变化缓慢进化。确定这种生态稳定性的原因是了解的机制，控制的克里思和模式的社区evolution.Methodology/主要研究结果：如果社区组装控制当地的环境选择，而不是分散，环境扰动会改变社区组成，然而，这可能会恢复一旦环境条件恢复到以前的状态。我们分析了在大西洋>10（4）km纬度断面的浮游植物群落组成，并表明广泛分布的物种的当地环境选择主要控制群落结构。与这些结果相一致的是，过去25万年来海洋硅藻的三个独立化石记录显示，群落的离开和恢复周期与地球气候的时间变化紧密同步。栖息地条件的变化极大地改变了群落结构，然而，我们得出结论，海洋浮游微生物的高度分散抹去了过去环境条件的遗产，从而降低了群落进化的克里思。
Background: Despite enormous environmental variability linked to glacial/interglacial climates of the Pleistocene, we have recently shown that marine diatom communities evolved slowly through gradual changes over the past 1.5 million years. Identifying the causes of this ecological stability is key for understanding the mechanisms that control the tempo and mode of community evolution.Methodology/Principal Findings: If community assembly were controlled by local environmental selection rather than dispersal, environmental perturbations would change community composition, yet, this could revert once environmental conditions returned to previous-like states. We analyzed phytoplankton community composition across >10(4) km latitudinal transects in the Atlantic Ocean and show that local environmental selection of broadly dispersed species primarily controls community structure. Consistent with these results, three independent fossil records of marine diatoms over the past 250,000 years show cycles of community departure and recovery tightly synchronized with the temporal variations in Earth's climate.Conclusions/Significance: Changes in habitat conditions dramatically alter community structure, yet, we conclude that the high dispersal of marine planktonic microbes erases the legacy of past environmental conditions, thereby decreasing the tempo of community evolution.