Bacterial community structure across a sand dune chronosequence at the Indiana Dunes National Park

IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Muruleedhara N. Byappanahalli , Noel B. Pavlovic , Cindy H. Nakatsu
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Abstract

The microbial role in dune succession along the Great Lakes freshwater sand dunes remains poorly understood. A chronosequence study was conducted to understand the relationships among soil bacterial communities, soil chemistry, and prescribed burning at the Indiana Dunes National Park. Soil bacterial communities and chemistry, as well as groundlayer vegetation were sampled during 2015 and 2017 from seven successional stages from the beach (contemporary) to the 14,000-year-old oak forest. Bacterial communities from unburned and burned sites among stages were determined by 16S rRNA gene amplicon sequencing. Soil pH and cations decreased from early (beach, foredune, secondary dune, and woodland transition) to late (oak savanna, woodland, and oak forest) successional stages, while organic matter and organic carbon concentrations increased in the late successional stages. Bacterial alpha diversity showed no significant differences among stages, but a significant interaction was found between stage and prescribed burning (H = 39.7, p < 0.001). Bacterial communities separated mainly along stage by all four beta diversity metrics used (Bray Curtis, Jaccard, and Weighted and Unweighted UniFrac), with the main difference observed along the primary axis (weighted UniFrac, 48 %). Bacterial phyla were differentially abundant in older soil stages compared to beach (ANCOM-BC, q < 0.05); likewise, differential abundances in genera were evident when burned and unburned sites were compared. A Mantel test indicated stronger congruency between the bacterial communities and soil chemistry than between bacterial communities and vegetation. Collectively, soil chemical and microbial parameters along with management practices contribute to dunal successional patterns in the Great Lakes.
细菌群落结构跨越沙丘时间序列在印第安纳沙丘国家公园
微生物在五大湖淡水沙丘沙丘演替中的作用仍然知之甚少。在印第安纳沙丘国家公园进行了一项时间顺序研究,以了解土壤细菌群落、土壤化学和规定燃烧之间的关系。在2015年和2017年期间,从海滩(当代)到14000年历史的橡树林的七个连续阶段,对土壤细菌群落和化学成分以及底层植被进行了采样。通过16S rRNA基因扩增子测序,确定各阶段未烧伤和烧伤部位的细菌群落。土壤pH和阳离子从演替早期(滩地、前丘、次生沙丘和林地过渡)到演替后期(栎树草原、林地和栎林)呈下降趋势,有机质和有机碳浓度在演替后期呈上升趋势。细菌α多样性在不同阶段间无显著差异,但在不同阶段和规定燃烧之间存在显著的相互作用(H = 39.7, p < 0.001)。通过使用的所有四种beta多样性指标(Bray Curtis, Jaccard,加权和未加权UniFrac),细菌群落主要沿着阶段分离,主要沿着主轴(加权UniFrac, 48%)观察到差异。与滩地相比,较老土壤阶段细菌种类丰富(ANCOM-BC, q < 0.05);同样,当比较燃烧和未燃烧的地点时,一般的差异丰度是明显的。Mantel试验表明,细菌群落与土壤化学的一致性强于细菌群落与植被的一致性。总的来说,土壤化学和微生物参数以及管理措施有助于五大湖的昼夜演替模式。
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来源期刊
Journal of Great Lakes Research
Journal of Great Lakes Research 生物-海洋与淡水生物学
CiteScore
5.10
自引率
13.60%
发文量
178
审稿时长
6 months
期刊介绍: Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.
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