A. Marshall, A. Longmore, L. Phillips, C. Tang, H. Hayden, K. Heidelberg, P. Mele
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引用次数: 6
摘要
底栖微生物群落通过厌氧氨氧化、硝化作用和固氮作用等分类群特有的过程,以及反硝化作用等群落特有的途径,对沿海生态系统中的氮循环做出贡献。通过测量半封闭海湾表层沉积物总(基于dna)和活性(基于rnaba)微生物群落组成以及关键n循环基因的丰度和活性谱我们发现,尽管靠近河口输入(Hobsons Bay [HB])的n循环分类群的总相对丰度相对较低,但该群落进行各种n循环过程的能力相对高于与输入隔离的沉积物(Central PPB [CPPB])。在HB中,沉积物微生物群落的季节性结构发生在春季和夏季之间,与厌氧氨氧化菌活性谱和有机碳含量的下降共同发生。在硝化菌或社区途径反硝化的活性谱中未检测到变化。虽然CPPB沉积物微生物群落不存在季节性结构,但关键n循环基因的活性谱表现出较高的位点内变异性。这些结果表明,尽管N循环分类群在河口影响沉积物(HB)的总群落组成中所占比例较小,但这些微生物群落始终参与N循环过程,并且该群落组成的季节性不稳定性并不反映其通过耦合硝化-反硝化循环N的能力的变化,而可能通过厌氧氨氧化群落的变化。
Nitrogen cycling in coastal sediment microbial communities with seasonally variable benthic nutrient fluxes
Benthic microbial communities contribute to nitrogen (N) cycling in coastal ecosystems through taxon-specific processes such as anammox, nitrification and N-fixation and community attributed pathways such as denitrification. By measuring the total (DNA-based) and active (RNAbased) surface sediment microbial community composition and the abundance and activity profiles of key N-cycling genes in a semi-enclosed embayment — Port Phillip Bay (PPB), Australia — we show that although the total relative abundance of N-cycling taxa is comparatively lower close to estuary inputs (Hobsons Bay [HB]), the capacity for this community to perform diverse N-cycling processes is comparatively higher than in sediments isolated from inputs (Central PPB [CPPB]). In HB, seasonal structuring of the sediment microbial community occurred between spring and summer, co-occurring with decreases in the activity profiles of anammox bacteria and organic carbon content. No changes were detected in the activity profiles of nitrifiers or the community-based pathway denitrification. Although no seasonal structuring of the sediment microbial community occurred in CPPB, the activity profiles of key N-cycling genes displayed comparatively higher within-site variability. These results show that despite N-cycling taxa representing a smaller fraction of the total community composition in estuary impacted sediments (HB) these microbial communities consistently engage in N-cycling processes and that seasonal instability in the composition of this community is not reflective of changes in its capacity to cycle N through coupled nitrification−denitrification but potentially via changes within the anammox community.
期刊介绍:
AME is international and interdisciplinary. It presents rigorously refereed and carefully selected Research Articles, Reviews and Notes, as well as Comments/Reply Comments (for details see AME 27:209), Opinion Pieces (previously called ''As I See It'') and AME Specials. For details consult the Guidelines for Authors. Papers may be concerned with:
Tolerances and responses of microorganisms to variations in abiotic and biotic components of their environment; microbial life under extreme environmental conditions (climate, temperature, pressure, osmolarity, redox, etc.).
Role of aquatic microorganisms in the production, transformation and decomposition of organic matter; flow patterns of energy and matter as these pass through microorganisms; population dynamics; trophic interrelationships; modelling, both theoretical and via computer simulation, of individual microorganisms and microbial populations; biodiversity.
Absorption and transformation of inorganic material; synthesis and transformation of organic material (autotrophic and heterotrophic); non-genetic and genetic adaptation; behaviour; molecular microbial ecology; symbioses.