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首页> 外文期刊>Applied and Environmental Microbiology >Within- and between-Lake Variability in the Composition of Bacterioplankton Communities: Investigations Using Multiple Spatial Scales
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Within- and between-Lake Variability in the Composition of Bacterioplankton Communities: Investigations Using Multiple Spatial Scales

机译：浮游细菌群落组成的湖内和湖间变异：使用多个空间尺度的调查

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This study examined the similarity of epilimnetic bacterial community composition (BCC) across several within- and among-lake spatial scales, and the environmental factors giving rise to similar bacterial communities in different lakes were also explored. Samples were collected from 13 northern and southern Wisconsin lakes representing gradients in lake size, productivity, dissolved organic carbon and humic acid contents, and pH. Hypotheses regarding patchy distribution of bacterial communities in lakes were tested by comparing samples collected from nearby (tens of meters) and distant (hundreds of meters) sampling sites in the same lake. BCC was characterized by using a molecular fingerprinting technique, automated ribosomal intergenic spacer analysis (ARISA). Overall, samples collected at the 10-m, 100-m, and between-lake scales differed by 13, 17, and 75%, respectively. Variation at these last two scales was significant. The development of within-lake variation in BCC appeared to depend on the isolation of water by lake shoreline features such as bays or narrow constrictions. ARISA profiles from northern lakes had fewer peaks and were less similar to each other than were those of the southern lakes, suggesting that regional features do not necessarily lead to the development of similar bacterial communities. Lakes at similar positions on productivity and dissolved organic carbon concentration gradients had similar bacterial communities, and bacterial diversity was positively correlated with lake productivity and water temperature. Factorial studies taking into account these gradients, as well as regional spatial scales, should provide much insight into the nature of aquatic bacterial biogeography.
机译：这项研究检查了湖上和湖间几个空间尺度上表层细菌群落组成（BCC）的相似性，并探讨了在不同湖泊中引起相似细菌群落的环境因素。从威斯康星州北部和南部的13个湖泊中收集了样本，这些样本代表了湖泊大小，生产力，溶解的有机碳和腐殖酸含量以及pH值的梯度。通过比较从同一湖泊附近（数十米）和远处（数百米）采样点收集的样本，测试了有关湖泊中细菌群落斑块分布的假设。 BCC的特征是使用分子指纹技术，自动核糖体基因间间隔子分析（ARISA）。总体而言，在10米，100米和湖间尺度收集的样本分别相差13％，17％和75％。最后两个等级的差异很大。 BCC湖内变化的发展似乎取决于湖泊海岸线特征（如海湾或狭窄的狭窄区域）对水的隔离。与南部湖泊相比，北部湖泊的ARISA分布峰较少，彼此之间的相似度较低，这表明区域特征不一定导致类似细菌群落的发展。生产力和溶解有机碳浓度梯度处于相似位置的湖泊具有相似的细菌群落，细菌多样性与湖泊生产力和水温呈正相关。考虑这些梯度以及区域空间尺度的析因研究应为水生细菌生物地理学的性质提供更多的见识。

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