Variable depth distribution of Trichodesmium clades in the North Pacific Ocean.
Variable depth distribution of Trichodesmium clades in the North Pacific Ocean.
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DOI：
10.1111/1758-2229.12488
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发表时间：
2016-12
影响因子：
3.3
通讯作者：
Mónica Rouco;S. T. Haley;Harriet Alexander;Samuel T. Wilson;D. Karl;S. Dyhrman
中科院分区：
文献类型：
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作者：
Mónica Rouco;S. T. Haley;Harriet Alexander;Samuel T. Wilson;D. Karl;S. Dyhrman
束毛藻属中固氮蓝藻的种群对海洋生态系统至关重要，然而预测束毛藻的分布模式及其在海洋生物地球化学中的作用是一个持续的挑战。这可能部分是由于束毛藻属物种的生理生态学差异，这通常不会在实地研究中独立考虑。在这项研究中，丰富的两个占主导地位的束毛藻分支（分支I和分支III）的调查期间，在站ALOHA在北太平洋副热带环流（NPSG）使用分支特异性qPCR方法。虽然分支I在束毛藻群落中占主导地位，但在一些NPSG样品中，分支III丰度>50%，而在北大西洋西部，分支III丰度总是80米，而分支III种群仅在混合层中观察到，并发现与深度和温度显著相关。这些数据表明活跃的生态位分区Trichodesmium物种从不同的分支，已经观察到在其他蓝藻。束毛藻的分布和生理追踪。将有助于更好地预测在现在和未来的海洋中的生理生态的这一地球化学重要属。
Populations of nitrogen-fixing cyanobacteria in the genus Trichodesmium are critical to ocean ecosystems, yet predicting patterns of Trichodesmium distribution and their role in ocean biogeochemistry is an ongoing challenge. This may, in part, be due to differences in the physiological ecology of Trichodesmium species, which are not typically considered independently in field studies. In this study, the abundance of the two dominant Trichodesmium clades (Clade I and Clade III) was investigated during a survey at Station ALOHA in the North Pacific Subtropical Gyre (NPSG) using a clade-specific qPCR approach. While Clade I dominated the Trichodesmium community, Clade III abundance was >50% in some NPSG samples, in contrast to the western North Atlantic where Clade III abundance was always 80 m, while Clade III populations were only observed in the mixed layer and found to be significantly correlated with depth and temperature. These data suggest active niche partitioning of Trichodesmium species from different clades, as has been observed in other cyanobacteria. Tracking the distribution and physiology of Trichodesmium spp. would contribute to better predictions of the physiological ecology of this biogeochemically important genus in the present and future ocean.