Ecological processes shaping highly connected bacterial communities along strong environmental gradients.

IF 3.5 3区 生物学 Q2 MICROBIOLOGY FEMS microbiology ecology Pub Date : 2024-10-30 DOI:10.1093/femsec/fiae146
Wenxue Wu, Chih-Hao Hsieh, Ramiro Logares, Jay T Lennon, Hongbin Liu
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Abstract

Along the river-sea continuum, microorganisms are directionally dispersed by water flow while being exposed to strong environmental gradients. To compare the two assembly mechanisms that may strongly and differently influence metacommunity dynamics, namely homogenizing dispersal and heterogeneous selection, we characterized the total (16S rRNA gene) and putatively active (16S rRNA transcript) bacterial communities in the Pearl River-South China Sea Continuum, during the wet (summer) and dry (winter) seasons using high-throughput sequencing. Moreover, well-defined sampling was conducted by including freshwater, oligohaline, mesohaline, polyhaline, and marine habitats. We found that heterogeneous selection exceeded homogenizing dispersal in both the total and active fractions of bacterial communities in two seasons. However, homogeneous selection was prevalent (the dominant except in active bacterial communities during summer), which was primarily due to the bacterial communities' tremendous diversity (associated with high rarity) and our specific sampling design. In either summer or winter seasons, homogeneous and heterogeneous selection showed higher relative importance in total and active communities, respectively, implying that the active bacteria were more responsive to environmental gradients than were the total bacteria. In summary, our findings provide insight into the assembly of bacterial communities in natural ecosystems with high spatial connectivity and environmental heterogeneity.

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沿着强烈的环境梯度塑造高度关联细菌群落的生态过程。
在河-海连续体中,微生物被水流定向分散,同时暴露在强烈的环境梯度中。为了比较可能对元群落动态产生强烈而不同影响的两种集结机制,即同质化扩散和异质选择,我们利用高通量测序技术,对珠江-南海连续带雨季(夏季)和旱季(冬季)的总细菌群落(16S rRNA基因)和假定活跃细菌群落(16S rRNA转录本)进行了表征。此外,我们还进行了明确的取样,包括淡水、低盐水、中盐水、多盐水和海洋栖息地。我们发现,在两个季节的细菌群落中,异质选择在总量和活性部分都超过了同质分散。然而,同质选择非常普遍(除夏季活跃细菌群落外,同质选择占主导地位),这主要是由于细菌群落的多样性(与高度稀有性相关)和我们特定的取样设计造成的。在夏季或冬季,同质选择和异质选择分别在全部细菌群落和活跃细菌群落中显示出更高的相对重要性,这意味着活跃细菌群落比全部细菌群落对环境梯度的反应更灵敏。总之,我们的研究结果为我们提供了在具有高度空间连通性和环境异质性的自然生态系统中组建细菌群落的见解。
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来源期刊
FEMS microbiology ecology
FEMS microbiology ecology 生物-微生物学
CiteScore
7.50
自引率
2.40%
发文量
132
审稿时长
3 months
期刊介绍: FEMS Microbiology Ecology aims to ensure efficient publication of high-quality papers that are original and provide a significant contribution to the understanding of microbial ecology. The journal contains Research Articles and MiniReviews on fundamental aspects of the ecology of microorganisms in natural soil, aquatic and atmospheric habitats, including extreme environments, and in artificial or managed environments. Research papers on pure cultures and in the areas of plant pathology and medical, food or veterinary microbiology will be published where they provide valuable generic information on microbial ecology. Papers can deal with culturable and non-culturable forms of any type of microorganism: bacteria, archaea, filamentous fungi, yeasts, protozoa, cyanobacteria, algae or viruses. In addition, the journal will publish Perspectives, Current Opinion and Controversy Articles, Commentaries and Letters to the Editor on topical issues in microbial ecology. - Application of ecological theory to microbial ecology - Interactions and signalling between microorganisms and with plants and animals - Interactions between microorganisms and their physicochemical enviornment - Microbial aspects of biogeochemical cycles and processes - Microbial community ecology - Phylogenetic and functional diversity of microbial communities - Evolutionary biology of microorganisms
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