Experimental results: Remineralization experiments to assess the ability of natural assemblages of bacteria to utilize DOM produced under Si and N limitation (SBDOM project, SBC LTER project)

<p>Culture studies of diatoms that dominate spring blooms in the Santa Barbara Channel were used to examine the effects of N and Si stress on the magnitude of production and the chemical composition of DOM (see the <a href=\"http://www.bco-dmo.org/dataset/518427\">BIB Experiments</a> dataset). The ability of natural assemblages of bacteria to utilize DOM produced under Si and N limitation was then assessed using remineralization experiments. Species examined in the remineralization experiments include: <em>Skeletonema marinoi</em>, <em>Chaetoceros socialis</em>, <em>Thalassiosira weissflogii</em>, and <em>Odontella aurita</em>.</p>

本研究以圣巴巴拉海峡（Santa Barbara Channel）春季水华优势硅藻为对象开展培养实验，旨在探究氮（N）、硅（Si）营养胁迫对硅藻生产力水平及溶解有机物（Dissolved Organic Matter, DOM）化学组成的影响（相关实验数据详见<a href="http://www.bco-dmo.org/dataset/518427">BIB Experiments数据集</a>）。随后通过再矿化实验，评估了细菌自然群落利用硅、氮限制条件下产生的溶解有机物的能力。本次再矿化实验所涉及的硅藻物种包括：<em>马里诺斯凯藻（Skeletonema marinoi）</em>、<em>社会角毛藻（Chaetoceros socialis）</em>、<em>威氏海链藻（Thalassiosira weissflogii）</em>以及<em>耳状齿藻（Odontella aurita）</em>。