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Phytoplankton biomass and size fractions in surface waters of the Australian sector of the southern ocean

机译:南部海洋澳大利亚海域表层水中的浮游植物生物量和大小分数

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We collected surface water along the 142nd E meridian from Tasmania to Antarctica in December 1999. We measured temperature, salinity and total chlorophyll a; additionally, we collected suspended particle size fractions and used fluorometric analysis to determine the quantity of chlorophyll a in each of four cell size classes: picoplankton (<3 μm), two nanoplankton fractions (3–10 μm and 10–20 μm) and microplankton (> 20 μm). Changes in temperature and salinity show that we crossed 6 water masses separated by 5 fronts. We found low abundance (<0.2 mg m?3) of chlorophyll in all size classes, with the exception of higher values near the continent (0.2 to 0.4 mg m?3). Lowest chlorophyll values (<0.1 mg m?3) were found in the Polar Frontal Zone (51° to 54°S). Microplankton made up the largest portion of total chlorophyll throughout most of the region. We conclude that biomass of all phytoplankton fractions, especially pico-and nanoplankton, was constrained by limiting factors, most probably iron, throughout the region and that ecosystem dynamics within a zone are not circumpolar but are regionalized within sectors.
机译:我们于1999年12月从塔斯马尼亚州到南极洲沿第142个子午线收集了地表水。我们测量了温度,盐度和总叶绿素a。此外,我们收集了悬浮颗粒大小的分数,并使用荧光分析法确定了四种细胞大小类别中的每一种的叶绿素a的量:皮克浮游生物(<3μm),两个纳米浮游生物分数(3–10μm和10–20μm)和微浮游生物(> 20微米)。温度和盐度的变化表明,我们越过了6个水团,被5个前沿分开。我们发现所有大小等级的叶绿素含量都较低(<0.2 mg m?3),但在非洲大陆附近的叶绿素含量较高(0.2至0.4 mg m?3)。在极地额叶带(51°至54°S)发现最低的叶绿素值(<0.1 mg m?3)。在整个区域的大部分地区,浮游植物构成了总叶绿素的最大部分。我们得出的结论是,整个区域中所有浮游植物部分(尤其是皮克和纳米浮游生物)的生物量都受到限制因素(最可能是铁)的约束,并且一个区域内的生态系统动态不是绕极性的,而是区域化的。

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