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CO_2 effects on taxonomic composition and nutrient utilization in an Equatorial Pacific phytoplankton assemblage

机译:赤道太平洋浮游植物组合中CO_2对生物分类组成和养分利用的影响

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摘要

We report the results of a field incubation experiment demonstrating a substantial shift in the taxonomic composition of Equatorial Pacific phytoplankton assemblages exposed to CO_2 levels of 150 and 750 ppm(dissolved CO_2~3 to 25μM). By the end of the experiment, the phytoplankton community in all samples was dominated by diatoms and Phaeocystis sp. However, the relative abun- dance of these phytoplankton taxa differed significantly between CO_2 treatments. Taxonomic pig- ment analysis and direct microscopic examination of samples revealed that the abundance of diatoms decreased by~50/100 at low CO_2 relative to high CO_2, while the abundance of Phaeocystis increased by~60/100 at low CO_2.
机译:我们报告了一个现场孵化实验的结果,该实验证明了暴露于150和750 ppm(溶解的CO_2〜3至25μM)水平的赤道太平洋浮游植物组合的生物分类组成发生了重大变化。到实验结束时,所有样品中的浮游植物群落均以硅藻和Phaeocystis sp。为主导。但是,这些浮游植物类群的相对丰度在CO_2处理之间存在显着差异。分类学色素分析和样品的直接显微镜检查显示,相对于高CO_2,硅藻的含量在低CO_2时降低了约50/100,而在高CO_2时,囊藻的丰度提高了约60/100。

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