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Microbial response to enhanced phosphorus cycling in the North Pacific Subtropical Gyre

机译：微生物对北太平洋副热带高压磷循环的响应

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摘要

Microbial community response to nitrogen (N) amendments and induced phosphorus (P) stress was investigated in the North Pacific Subtropical Gyre (NPSG). Samples amended with reduced sources of N, in the form of nitrate plus ammonium, showed significant increases in microbial cell abundance and biomass and decreases in dissolved inorganic phosphate (Pi) and silicate concentrations during an incubation period of 6 d. Primary productivity, P uptake rates (as both Pi and adenosine-5'-triphosphate [ATP]) and alkaline phosphatase activity (APA) all increased following N amendment. Dissolved organic P (DOP) concentrations did not change, but the large increase in APA and ATP uptake rates suggests that DOP was a dynamic pool and an important source for microbial P nutrition in P-stressed samples. Significant changes were also observed in the structure of the microbial community, with Synechococcus and picoalgae abundances increasing substantially in the N-amended treatments, while non-pigmented picoplankton abundances were unchanged. Data on P resource partitioning among groups of picoplankton separated by size using membrane filters of different porosities, or by scattering and fluorescence properties using flow cytometry sorting, indicate that Synechococcus could have a greater role in the NPSG P cycling following episodic N inputs. This experimental manipulation of nutrient loading combined with observations at the total population to the microbial group levels constitutes a unique approach to improve our understanding of microbial community structure and function in response to environmental forcing.
机译：在北太平洋亚热带环流（NPSG）中研究了微生物群落对氮（N）修正和诱导的磷（P）胁迫的响应。在6 d的潜伏期中，以减少的N源（以硝酸盐+铵的形式）修正的样品显示出微生物细胞丰度和生物量显着增加，并且溶解的无机磷酸盐（Pi）和硅酸盐浓度降低。氮素改良后，初级生产力，P吸收速率（Pi和5'-三磷酸腺苷[ATP]）和碱性磷酸酶活性（APA）均增加。溶解的有机磷（DOP）浓度没有变化，但是APA和ATP吸收率的大幅提高表明DOP是动态池，是磷胁迫样品中微生物磷营养的重要来源。在微生物群落的结构中也观察到了显着变化，在经过N修正的处理中，Synechococcus和picoalgae的丰度显着增加，而未着色的pick浮游生物的丰度保持不变。有关使用不同孔隙度的膜滤器按大小分开的微微浮游生物之间的磷资源分配的数据，或使用流式细胞仪分选通过散射和荧光特性对微微浮游生物进行磷资源分配的数据，表明，在偶发性N输入后，聚球菌在NPSG P循环中可能发挥更大的作用。这种对营养物负荷的实验性操作，结合对总微生物种群水平的观察，构成了一种独特的方法，可以提高我们对微生物群落结构和功能的认识，以应对环境强迫。

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  • 来源
    《Marine ecology progress series》 |2014年第14期|43-58|共16页
  • 作者

    Solange Duhamel; Karin M. Bjoerkman; Joseph K. Doggett; David M. Karl;

  • 作者单位

    Daniel K. Inouye Center for Microbial Oceanography: Research and Education (C-MORE), University of Hawaii, C-MORE Hale, 1950 East West Road, Honolulu, Hawaii 96822, USA,Lamont-Doherty Earth Observatory, Division of Biology and Paleo Environment, Columbia University,PO Box 1000, 61 Route 9W, Palisades, New York 10964, USA;

    Daniel K. Inouye Center for Microbial Oceanography: Research and Education (C-MORE), University of Hawaii, C-MORE Hale, 1950 East West Road, Honolulu, Hawaii 96822, USA;

    Daniel K. Inouye Center for Microbial Oceanography: Research and Education (C-MORE), University of Hawaii, C-MORE Hale, 1950 East West Road, Honolulu, Hawaii 96822, USA;

    Daniel K. Inouye Center for Microbial Oceanography: Research and Education (C-MORE), University of Hawaii, C-MORE Hale, 1950 East West Road, Honolulu, Hawaii 96822, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Phosphorus dynamics; Microbes; Flow cytometry cell sorting; North Pacific Subtropical Gyre;

    机译：磷动力学;微生物;流式细胞仪细胞分选;北太平洋亚热带环流;

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