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首页> 外文期刊>Paleoceanography >Reconstructing the phytoplankton community of the Cariaco Basin during the Younger Dryas cold event using chlorin steryl esters
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Reconstructing the phytoplankton community of the Cariaco Basin during the Younger Dryas cold event using chlorin steryl esters

机译：使用二氢卟酚甾醇酯重建年轻得里亚斯寒冷事件期间的Cariaco盆地浮游植物群落

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摘要

A record of the downcore distribution of chlorin steryl esters (CSEs) through the Younger Dryas was produced from Cariaco Basin sediments in order to assess the potential use of CSEs as recorders of the structure of phytoplankton communities through time. Using an improved high-performance liquid chromatography method for the separation of CSEs, we find significant changes in the distribution of CSEs during the Younger Dryas in the Cariaco Basin. During the Younger Dryas, enhanced upwelling in the Cariaco Basin caused an increase in the diatom population and therefore an increase in the relative abundance of CSEs derived from diatoms. In contrast, the dinoflagellate population, and therefore CSEs derived from dinoflagellates, decreased in response to the climate change during the Younger Dryas. These community shifts agree well with the shifts observed in the present day on a seasonal basis that result from the north-south migration of the Intertropical Convergence Zone over the Cariaco Basin. We also identify changes in the abundance of several CSEs that seem to reflect rapid warming and cooling events. This study suggests that CSEs are useful proxies for reconstructing phytoplankton communities and paleoenvironments.
机译：通过Cariaco盆地的沉积物记录了通过Younger Dryas生成的二氢树香甾醇酯（CSE）的下游分布的记录，目的是评估CSE作为潜在的浮游植物群落结构记录器的潜在用途。通过使用改进的高效液相色谱方法分离CSE，我们发现了Cariaco盆地的Younger Dryas期间CSE的分布发生了显着变化。在“年轻树”期间，Cariaco盆地上升流加剧，导致硅藻种群增加，因此，源自硅藻的CSE相对丰度也增加了。相反，由于鞭毛幼果期间的气候变化，鞭毛藻的种群减少，因此衍生自鞭毛藻的CSE减少。这些群落变化与今天观测到的季节性变化非常吻合，该变化是由Cariaco盆地上的热带收敛带的南北向迁移所引起的。我们还确定了一些CSE的丰度变化，这些变化似乎反映了快速的升温和降温事件。这项研究表明，CSE是重建浮游植物群落和古环境的有用代理。

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