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首页> 外文期刊>Marine ecology progress series >Changes in the metabolic balance of contrasting microbial food webs after nutrient enrichment
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Changes in the metabolic balance of contrasting microbial food webs after nutrient enrichment

机译：营养物质富集后对比微生物食物网的代谢平衡变化

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摘要

Two sets of inorganic (nitrate, ammonium, phosphate) and/or organic (glucose, amino acids) nutrient addition experiments were performed in contrasting planktonic ecosystems, including both oligotrophic central Atlantic waters and mesotrophic coastal waters off the NW Iberian Peninsula, to assess the direction and magnitude of the shifts in the metabolic balance, defined as the primary production to community respiration ratio (P/R), of different microbial plankton communities. Large (>2 μm) phytoplankton accounted for most of the primary production response to nutrient additions in all the microbial plankton communities studied. Microbial plankton metabolic shifts after inorganic or organic nutrient additions appeared to be dependent on both the production and biomass size structure of phytoplankton communities. The strongest tendencies towards short-term autotrophy (after inorganic additions) and heterotrophy (after organic additions) were registered in microbial communities initially dominated by large phytoplankton cells (i.e. herbivore food webs) with high and low relative contribution of large cells to primary production, respectively, suggesting that the metabolic balance of herbivore food webs is less resistant to nutrient additions than that of microbial food webs (dominated by picophyto-plankton). By contrast, regardless of the trophic structure of phytoplankton populations, the short-term response of the microbial plankton metabolic balance to the combined inorganic and organic nutrient additions appeared to be mainly related to the initial P/R ratios, which implies that the more heterotrophic the microbial community, the stronger the tendency towards heterotrophy after mixed additions.
机译：在形成对比的浮游生态系统中，进行了两组无机（硝酸盐，铵盐，磷酸盐）和/或有机物（葡萄糖，氨基酸）营养物添加实验，以评估伊比利亚西北半岛外围的贫营养性大西洋中部水域和中营养性沿海水域。不同微生物浮游生物群落代谢平衡变化的方向和幅度，定义为初级生产与群落呼吸比（P / R）。在所有研究的微生物浮游生物群落中，大的（> 2μm）浮游植物占大多数对养分添加的主要生产反应。添加无机或有机养分后微生物浮游生物的代谢变化似乎既取决于浮游植物群落的产量，又取决于生物量的大小结构。在最初以大型浮游植物细胞（即草食动物食物网）为主导的微生物群落中，出现了短期自养（无机添加后）和异养（有机添加后）的最强趋势，而大细胞对初级生产的相对贡献较低，分别表明，草食性食物网的代谢平衡对营养添加的抵抗力比微生物食物网（以浮游植物为主）的抵抗力低。相比之下，无论浮游植物种群的营养结构如何，微生物浮游生物代谢平衡对无机和有机营养素组合的短期反应似乎主要与初始P / R比有关，这意味着营养性更强微生物群落，混合添加后异养的趋势越强。

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  • 来源
    《Marine ecology progress series》 |2012年第21期|p.9-19|共11页
  • 作者

    S. Martinez-Garcia; E. Teira; E. Fernandez;

  • 作者单位

    Departamento Ecoloxia e Bioloxia Animal, Universidade de Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain;

    Departamento Ecoloxia e Bioloxia Animal, Universidade de Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain;

    Departamento Ecoloxia e Bioloxia Animal, Universidade de Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain;

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  • 正文语种 eng
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  • 关键词

    microbial plankton; nutrient amendments;

    机译：微生物浮游生物营养补充剂;

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