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首页> 外文期刊>Mycologia >Dictyostelid cellular slime molds associated with grasslands of the central and western United States.
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Dictyostelid cellular slime molds associated with grasslands of the central and western United States.

机译：Dictyostelid细胞粘液霉菌，与美国中西部的草原有关。

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Dictyostelid cellular slime molds (dictyostelids) associated with grassland ecosystems of the central and western United States were investigated at nine sites that included examples of the three major ecological types of grasslands (tall grass, mixed grass and short grass) generally recognized for the region. Samples of soil/humus collected from each site were examined with the Cavender method of isolating dictyostelids. For each of those six sites with well developed gallery forests present, an additional set of forest soil/humus samples was collected. A more intensive sampling effort was carried out at one site (Konza LTER) to assess the possible effects of burning and grazing on dictyostelid diversity and density. Twelve species of dictyostelids were recovered from grassland sites, whereas gallery forest sites yielded only nine species. Four cosmopolitan species (Dictyostelium giganteum, D. mucoroides, D. sphaerocephalum and Polysphondylium pallidum) were represented by the greatest densities of clones, with D. sphaerocephalum particularly common. The general pattern across all sites was that both species richness and density of dictyostelids decreased with decreasing precipitation. Samples collected from ungrazed grassland plots yielded higher numbers of both species and clones as compared to grazed plots, and the general pattern was for both values to increase as the interval between fires increased. For numbers of clones this correlation was statistically significant.Digital Object Identifier http://dx.doi.org/10.3852/09-099
机译：在九个地点调查了与美国中部和西部草地生态系统相关的Dictyostelid细胞粘液霉菌（dictyostelids），其中包括该地区公认的三种主要生态类型的草原（高草，混合草和短草）的例子。使用Cavender方法分离双翅目硬皮鱼，检查从每个部位收集的土壤/腐殖质样品。对于这六个场馆林发育良好的地点，每个地点都采集了另外一组森林土壤/腐殖质样品。在一个地点（Konza LTER）进行了更深入的采样工作，以评估焚烧和放牧对盘状硬皮动物多样性和密度的可能影响。从草地站点中发现了十二种独角兽科动物，而画廊森林站点仅产生了九种。四种大都会物种（ Dictyostelium giganteum ， D。mucoroides ， D.sphaerocephalum 和 Polysphondylium pallidum 代表）克隆的最大密度， D。头球尤其常见。所有地点的总体格局是，物种丰富度和独角兽科动物的密度都随着降水的减少而降低。与放牧的土地相比，从未湿润的草地上收集的样品产生的物种和克隆数量都更多，并且一般模式是两种值都随着火间隔的增加而增加。对于克隆数量而言，这种相关性具有统计学意义。数字对象标识符http://dx.doi.org/10.3852/09-099

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