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首页> 外文期刊>Applied Microbiology >Rates of Species Accumulation and Taxonomic Diversification during Phototrophic Biofilm Development Are Controlled by both Nutrient Supply and Current Velocity
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Rates of Species Accumulation and Taxonomic Diversification during Phototrophic Biofilm Development Are Controlled by both Nutrient Supply and Current Velocity

机译：营养养生生物膜发育过程中物种积累和分类多样化的速率受养分供应和流速的控制。

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The accumulation of new and taxonomically diverse species is a marked feature of community development, but the role of the environment in this process is not well understood. To address this problem, we subjected periphyton in laboratory streams to low (10-cm · s~(?1)), high (30-cm · s~(?1)), and variable (9- to 32-cm · s~(?1)) current velocity and low- versus high-nutrient inputs. We examined how current velocity and resource supply constrained (i) the rates of species accumulation, a measure of temporal beta-diversity, and (ii) the rates of diversification of higher taxonomic categories, defined here as the rate of higher taxon richness increase with the increase of species richness. Temporal biofilm dynamics were controlled by a strong nutrient-current interaction. Nutrients accelerated the rates of accumulation of new species, when flow velocity was not too stressful. Species were more taxonomically diverse under variable than under low-flow conditions, indicating that flow heterogeneity increased the niche diversity in the high-nutrient treatments. Conversely, the lower diversification rates under high- than under low-nutrient conditions at low velocity are explained with finer resource partitioning among species, belonging to a limited number of related genera. The overall low rates of diversification in high-current treatments suggest that the ability to withstand current stress was conserved within closely related species. Temporal heterogeneity of disturbance has been shown to promote species richness, but here we further demonstrate that it also affects two other components of biodiversity, i.e., temporal beta-diversity and diversification rate. Therefore, management efforts for preserving the inherent temporal heterogeneity of natural ecosystems will have detectable positive effects on biodiversity.
机译：新的和分类学上多样化的物种的积累是社区发展的显着特征，但是人们对环境在这一过程中的作用知之甚少。为了解决这个问题，我们对实验室水流中的附生植物进行了低（10-cm·s〜（？1）），高（30-cm·s〜（？1））和可变的（9至32-cm· s〜（？1））当前速度以及低营养素输入与高营养素输入。我们研究了当前的速度和资源供应如何限制（i）物种积累的速率，时间β多样性的度量，以及（ii）高分类类别的多样化速率，这里定义为高分类单元丰富度随物种丰富度的增加。时间生物膜动力学受到强烈的营养-电流相互作用的控制。当流速不太高时，营养物质加速了新物种的积累速度。与低流量条件下相比，可变条件下的物种在分类学上的多样性更高，这表明在高营养条件下，流量异质性增加了生态位的多样性。相反，在高养分条件下低速低营养条件下的多样化速率较低，而物种间的资源分配更精细，属于相关属的数量有限。在高电流治疗中总体上较低的多样化率表明，在密切相关的物种中，承受电流压力的能力得以保留。扰动的时间异质性已显示出促进物种丰富性，但在此我们进一步证明，它也影响生物多样性的其他两个组成部分，即时间β多样性和多样化速率。因此，为维护自然生态系统固有的时间异质性而进行的管理努力将对生物多样性产生可察觉的积极影响。

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