Traving Sachia J, Bentzon-Tilia Mikkel, Knudsen-Leerbeck Helle, Mantikci Mustafa, Hansen Jørgen L S, Stedmon Colin A, Sørensen Helle, Markager Stiig, Riemann Lasse
Centre for Ocean Life, Marine Biological Section, University of Copenhagen Helsingør, Denmark.
Marine Biological Section, University of Copenhagen Helsingør, Denmark.
Front Microbiol. 2016 Sep 27;7:1533. doi: 10.3389/fmicb.2016.01533. eCollection 2016.
Bacterioplankton play a key role in marine waters facilitating processes important for carbon cycling. However, the influence of specific bacterial populations and environmental conditions on bacterioplankton community performance remains unclear. The aim of the present study was to identify drivers of bacterioplankton community functions, taking into account the variability in community composition and environmental conditions over seasons, in two contrasting coastal systems. A Least Absolute Shrinkage and Selection Operator (LASSO) analysis of the biological and chemical data obtained from surface waters over a full year indicated that specific bacterial populations were linked to measured functions. Namely, () was strongly correlated with protease activity. Both function and community composition showed seasonal variation. However, the pattern of substrate utilization capacity could not be directly linked to the community dynamics. The overall importance of dissolved organic matter (DOM) parameters in the LASSO models indicate that bacterioplankton respond to the present substrate landscape, with a particular importance of nitrogenous DOM. The identification of common drivers of bacterioplankton community functions in two different systems indicates that the drivers may be of broader relevance in coastal temperate waters.
浮游细菌在海水中发挥着关键作用，推动着对碳循环至关重要的过程。然而，特定细菌种群和环境条件对浮游细菌群落性能的影响仍不清楚。本研究的目的是在两个形成对比的沿海系统中，考虑到群落组成和环境条件随季节的变化，确定浮游细菌群落功能的驱动因素。对全年从表层水体获得的生物和化学数据进行的最小绝对收缩和选择算子（LASSO）分析表明，特定细菌种群与所测功能相关联。具体而言，（）与蛋白酶活性密切相关。功能和群落组成均呈现季节性变化。然而，底物利用能力的模式无法直接与群落动态联系起来。LASSO模型中溶解有机物（DOM）参数的总体重要性表明，浮游细菌对当前的底物格局做出反应，其中含氮DOM尤为重要。在两个不同系统中确定浮游细菌群落功能的共同驱动因素表明，这些驱动因素可能在沿海温带水域具有更广泛的相关性。
