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High Bacterivory By The Smallest Phytoplankton In The North Atlantic Ocean

机译：北大西洋最小浮游植物的高噬菌体

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摘要

Planktonic algae <5 μm in size are major fixers of inorganic carbon in the ocean. They dominate phytoplankton biomass in post-bloom, stratified oceanic temperate waters. Traditionally, large and small algae are viewed as having a critical growth dependence on inorganic nutrients, which the latter can better acquire at lower ambient concentrations owing to their higher surface area to volume ratios. Nonetheless, recent phosphate tracer experiments in the oligotrophic ocean have suggested that small algae obtain inorganic phosphate indirectly, possibly through feeding on bac-terioplankton. There have been numerous microscopy-based studies of algae feeding mixotrophically in the laboratory and field, as well as mathematical modelling of the ecological importance of mixotrophy. However, because of methodological limitations there has not been a direct comparison of obligate heterotrophic and mixotrophic bacterivory. Here we present direct evidence that small algae carry out 40-95% of the bacterivory in the euphotic layer of the temperate North Atlantic Ocean in summer. A similar range of 37-70% was determined in the surface waters of the tropical North-East Atlantic Ocean, suggesting the global significance of mixotrophy. This finding reveals that even the smallest algae have less dependence on dissolved inorganic nutrients than previously thought, obtaining a quarter of their biomass from bacterivory. This has important implications for how we perceive nutrient acquisition and limitation of carbon-fixing protists as well as control of bacterioplankton in the ocean.
机译：小于5μm的浮游藻类是海洋中无机碳的主要固着剂。它们在开花后的分层温带海洋水域中占主导地位。传统上，大藻和小藻被视为对无机养分具有关键的生长依赖性，由于无机养分的表面积与体积之比较高，因此在较低的环境浓度下可以更好地获取。但是，最近在贫营养海洋中进行的磷酸盐示踪剂实验表明，小藻类可能间接地以浮游细菌为食而间接获得无机磷酸盐。在实验室和野外，已经有许多基于显微镜的藻类营养混合饲喂研究，以及混合营养的生态重要性的数学模型。但是，由于方法上的局限性，还没有直接比较专性异养菌和混养菌的细菌。在这里，我们提供了直接的证据，表明夏季夏季，小藻类在温带北大西洋的富营养层中进行了40-95％的细菌。在热带东北大西洋的地表水中测定的相似范围为37-70％，这表明混合营养的全球意义。这一发现表明，即使是最小的藻类，对溶解的无机养分的依赖性也比以前认为的要小，它们从细菌中获得了四分之一的生物量。这对我们如何理解养分获取和固碳原生生物的局限性以及对海洋中浮游生物的控制具有重要意义。

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  • 来源
    《Nature》 |2008年第7210期|p.224-226|共3页
  • 作者

    Mikhail V. Zubkov; Glen A. Tarran;

  • 作者单位

    National Oceanography Centre, Southampton, Hampshire SO14 3ZH, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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