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首页> 外文期刊>Marine ecology progress series >Microbial dynamics on diatom aggregates in Oresund, Denmark
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Microbial dynamics on diatom aggregates in Oresund, Denmark

机译：丹麦厄勒海峡硅藻聚集体上的微生物动力学

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摘要

Size, chemical composition, bacteria, flagellate, and ciliate abundance, bacterial production and growth rates as well as community respiration rates were measured on natural diatom aggregates of different sizes collected by SCUBA divers on 5 subsequent days offshore from northern Zealand, Denmark. Aggregate size was highly variable (0.16 to 524 mm~3) throughout the sampling period, whereas aggregate (agg.) dry mass (70 to 390 μg agg.~(-1)) and organic carbon content (48 to 130 μg agg.~(-1)) varied less. The composition of particulate organic amino acids on aggregates was very different from that of total dissolved amino acids in the matrix water of the aggregates. Bacteria, flagellates, and ciliates were 10- to 10000-fold enriched on aggregates compared to their abundance in the surrounding water. Enrichment factors of bacteria, flagellates, and ciliates decreased significantly with increasing aggregate size. Ciliates showed the highest and flagellates the lowest enrichment on aggregates. Absolute rate of bacterial production was significantly correlated with aggregate size, and it constantly increased on aggregates of similar size throughout the sampling period. Cell-specific production rates were consistently higher for aggregate-associated bacteria than for free-living bacteria, and 3 to 20% of all bacteria were produced on aggregates. High release of dissolved organic matter and bacteria into the surrounding water was indicated by the release of amino acids into the surrounding water and high calculated detachment rates of aggregate-associated bacteria. Marine snow, thus, should be regarded as comprising integral components rather than isolated microenvironments of the pelagic zone. Its nature has important consequences for organic matter cycling from small scales up to the global scale.
机译：随后在接下来的5天里，从SCUBA潜水员采集的不同大小的天然硅藻骨料，从丹麦北部新西兰离岸，测量了大小，化学成分，细菌，鞭毛和纤毛虫的丰度，细菌的产生和生长速率以及群落呼吸速率。在整个采样期间，骨料的大小变化很大（0.16至524 mm〜3），而骨料（总含量）干质量（70至390μgagg。〜（-1））和有机碳含量（48至130μgagg）。 〜（-1））变化较小。骨料上的颗粒有机氨基酸组成与骨料基质水中总溶解氨基酸的组成非常不同。细菌，鞭毛虫和纤毛虫的聚集体比周围水中的丰富度高10到10000倍。细菌，鞭毛和纤毛的富集因子随着聚集体尺寸的增加而显着降低。纤毛虫对聚集体的富集最高，鞭毛最低。细菌产生的绝对速率与聚集体大小显着相关，并且在整个采样期间，随着相似大小的聚集体的不断增加，细菌的绝对发生率不断增加。聚集体相关细菌的细胞特异生产率始终高于自由生活细菌，并且所有细菌中有3％至20％产生于聚集体。氨基酸向周围水中的释放以及计算出的聚集体相关细菌的高去除率表明了溶解有机物和细菌向周围水中的高释放。因此，应将海洋积雪视为整体组成部分，而不是中上层带的孤立微环境。它的性质对于从小规模到全球范围的有机物循环具有重要影响。

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