Microbes drive the majority of the global carbon cycle. The effect of environmental conditions on selecting microbial functional diversity is well established, and recent studies have revealed the effects of geographic distances on selecting the functional components of marine microbial communities. Our study is the first attempt at establishing the effects of environmental factors on driving the marine carbohydrate‐active enzyme (CAZyme) distribution. We characterized the diversity of CAZyme genes and investigated the correlations between their distributions and biogeographic parameters (latitude, longitude, distance from the equator, site depth, water depth, chlorophyll density, salinity and temperature). Therefore, we accessed a subset of surface water samples (38 metagenomes) from the Global Ocean Sampling project. Only chlorophyll and latitude altered the distribution patterns of CAZymes, revealing the existence of two latitudinal gradients (positive and negative) of marine CAZyme abundance. Considering the importance of carbohydrates in microbial life, characterization of the spatial patterns of the genetic repertoire involved in carbohydrate metabolism represents an important step in improving our understanding of the metabolic strategies associated with the microbial marine carbon cycle and their effects on the productivity of marine ecosystems.

中文翻译：

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纬度和叶绿素a密度驱动表皮上层带浮游微生物部分中碳水化合物活性酶的分布。

微生物驱动着全球碳循环的大部分。环境条件对选择微生物功能多样性的影响是众所周知的，最近的研究表明地理距离对选择海洋微生物群落功能成分的影响。我们的研究是首次尝试确定环境因素对推动海洋碳水化合物活性酶（CAZyme）分布的影响。我们表征了CAZyme基因的多样性，并研究了它们的分布与生物地理参数（纬度，经度，距赤道的距离，位点深度，水深，叶绿素密度，盐度和温度）之间的相关性。因此，我们从全球海洋采样项目中获取了地表水样本的一个子集（38个基因组）。只有叶绿素和纬度改变了CAZymes的分布方式，揭示了海洋CAZyme丰度存在两个纬度梯度（正值和负值）。考虑到碳水化合物在微生物生活中的重要性，表征参与碳水化合物代谢的遗传库的空间模式代表了一个重要步骤，可增进我们对与微生物海洋碳循环有关的代谢策略及其对海洋生态系统生产力的影响的了解。