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首页> 外文期刊>Journal of oceanography >Spatial Heterogeneity in Distributions of Chlorophyll a Derivatives in the Subarctic North Pacific during Summer
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Spatial Heterogeneity in Distributions of Chlorophyll a Derivatives in the Subarctic North Pacific during Summer

机译：北极亚太平洋北太平洋夏季叶绿素a衍生物分布的空间异质性

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The distribution of chlorophyll a derivatives was examined in samples collected from the subarctic North Pacific during July to September 1997. Pheophorbide a, pheophytin a and pyropheophorbide a as determined by high performance liquid chromatography (HPLC) were the major derivatives recorded. The distribution patterns of chlorophyll a and its derivatives showed a strong vertical and horizontal heterogeneity. Patches with high concentration of derivatives seemed to be associated with high concentration of chlorophyll a. A clear east-west gradient was observed in both chlorophyll a and pheophorbide a integrated from the surface to 100 m depth with significantly higher amounts of both the pigments in the Western Subarctic Gyre and in the Bering Sea than in the Alaskan Gyre. In contrast, no apparent gradient was observed in the integrated pyropheophorbide a and pheophytin a. Grazing experiments conducted with the copepod (Neocalanus cristatus) and salp (Cyclosalpa bakeri) fed on five species of phytoplankton cultures, showed a marked difference in the composition of the derivatives in their fecal pellets. Pyropheophorbide a was dominant in the copepod fecal pellet regardless of the phytoplankton species fed on. In the salp, however, pheophytin a and pheophorbide a were found in the fecal pellets, the relative concentrations varying with the algal food. Spatial heterogeneity in the distribution of the derivatives is considered to reflect local variations in dominant herbivorous processes.
机译：在1997年7月至9月从北极北太平洋收集的样品中检查了叶绿素a衍生物的分布。记录的主要衍生物是通过高效液相色谱（HPLC）测定的Phophphorbide a，ophophytin a和焦脱镁叶绿素a。叶绿素a及其衍生物的分布模式表现出很强的垂直和水平异质性。含有高浓度衍生物的贴剂似乎与高浓度的叶绿素a有关。从表面到深度为100 m的深度，在叶绿素a和脱镁叶绿素a中均观察到明显的东西向梯度，西部亚北极回旋区和白令海中的色素含量均明显高于阿拉斯加回旋区。相反，在整合的焦脱镁叶绿素a和脱镁叶绿素a中未观察到明显的梯度。用五种浮游植物养殖的the足类（Neocalanus cristatus）和sal类（Cyclosalpa bakeri）进行的放牧实验表明，它们粪便中的衍生物组成存在明显差异。拟焦磷酸铁素a在the足类粪便颗粒中占优势，而与浮游植物种类无关。然而，在粪便中，粪便中发现了脱镁叶绿素a和脱镁叶绿素a，其相对浓度随藻类食物的不同而变化。衍生物分布的空间异质性被认为反映了主要草食过程的局部变化。

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