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Effects of FPOM size and quality on aquatic heterotrophic bacteria

机译：FPOM大小和质量对水生异养细菌的影响

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Mechanical and biological processing in aquatic systems converts coarse particulate organic matter (CPOM) into fine particulate organic matter (FPOM). Other sources of particles with different size classes include flocculated dissolved matter, algae and soil particles. The relative magnitudes of these inputs are influenced by the degree of allochthony of a lake or stream. The size-reactivity hypothesis, formulated for dissolved organic matter, postulates that bacterial degradation rates are higher with high-molecular weight fractions than with low-molecular-weight fractions. In this study, we investigated the effect of particle size on degradation of POM and on freshwater bacterial communities. We generated leaf-derived particle size classes of the same age (same diagenesis status) but differing in quality (maple and beech leaves). Contrary to our expectations, we found a strong effect of particle size and no significant effect of substrate quality on community respiration which decreased at smaller particle size, on C:N ratios which declined with particle size, and on delta(15) N which showed a decreasing trend (though not significant) at smaller particle size in beech leaves. By contrast, bacterial community structure and partial derivative C-13 values responded mainly to particle quality. Bacterial biomass, estimated by qPCR, was affected by complex interactions between particle size and quality. These findings open an unanticipated perspective on the size-reactivity hypothesis for particulate organic matter. (C) 2016 The Author(s). Published by Elsevier GmbH. This is an open access article under the CC BY-NC-ND license.
机译：水生系统中的机械和生物处理将粗颗粒有机物（CPOM）转换为细颗粒有机物（FPOM）。具有不同尺寸类别的颗粒的其他来源包括絮凝的溶解物，藻类和土壤颗粒。这些输入的相对大小受湖泊或河流的异源度影响。针对溶解性有机物制定的尺寸反应性假设假设，高分子量级分的细菌降解速率高于低分子量级分的细菌降解速率。在这项研究中，我们调查了粒径对POM降解和淡水细菌群落的影响。我们生成了相同年龄（成岩状态相同）但质量不同（枫叶和山毛榉叶）的叶片来源的粒度等级。与我们的预期相反，我们发现粒径的影响很大，而底物质量对群落呼吸没有显着影响，在较小的粒径下，群落呼吸作用降低; C：N的比率随粒径下降;对δ（15）N表现出明显影响较小的山毛榉叶子中的颗粒呈下降趋势（尽管不显着）。相比之下，细菌群落结构和偏导C-13值主要对颗粒质量作出响应。通过qPCR估算的细菌生物量受到粒径和质量之间复杂相互作用的影响。这些发现为颗粒有机物的尺寸反应性假设开辟了意想不到的观点。 （C）2016作者。由Elsevier GmbH发布。这是CC BY-NC-ND许可下的开放获取文章。

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