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首页> 外文期刊>Applied Microbiology >Aquatic Hyphomycete Species Are Screened by the Hyporheic Zone of Woodland Streams
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Aquatic Hyphomycete Species Are Screened by the Hyporheic Zone of Woodland Streams

机译：通过林地溪流的带菌区筛选水生藻类物种

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Aquatic hyphomycetes strongly contribute to organic matter dynamics in streams, but their abilities to colonize leaf litter buried in streambed sediments remain unexplored. Here, we conducted field and laboratory experiments (slow-filtration columns and stream-simulating microcosms) to test the following hypotheses: (i) that the hyporheic habitat acting as a physical sieve for spores filters out unsuccessful strategists from a potential species pool, (ii) that decreased pore size in sediments reduces species dispersal efficiency in the interstitial water, and (iii) that the physicochemical conditions prevailing in the hyporheic habitat will influence fungal community structure. Our field study showed that spore abundance and species diversity were consistently reduced in the interstitial water compared with surface water within three differing streams. Significant differences occurred among aquatic hyphomycetes, with dispersal efficiency of filiform-spore species being much higher than those with compact or branched/tetraradiate spores. This pattern was remarkably consistent with those found in laboratory experiments that tested the influence of sediment pore size on spore dispersal in microcosms. Furthermore, leaves inoculated in a stream and incubated in slow-filtration columns exhibited a fungal assemblage dominated by only two species, while five species were codominant on leaves from the stream-simulating microcosms. Results of this study highlight that the hyporheic zone exerts two types of selection pressure on the aquatic hyphomycete community, a physiological stress and a physical screening of the benthic spore pool, both leading to drastic changes in the structure of fungal community.
机译：水生疏水菌对河流中有机物的动力学有很大贡献，但是它们对定殖在河床沉积物中的枯枝落叶的定殖能力尚未得到开发。在这里，我们进行了现场和实验室实验（慢速过滤柱和模拟流的微观世界），以检验以下假设：（i）充当孢子的物理筛网的流栖生境从潜在物种库中滤除了不成功的战略家，（ ii）沉积物孔径的减小会降低物种在间隙水中的扩散效率，并且（iii）排泄性生境中普遍存在的物理化学条件会影响真菌的群落结构。我们的田间研究表明，与三种不同流中的地表水相比，间隙水中的孢子丰度和物种多样性一直在下降。在水生疏水菌之间存在显着差异，丝状孢子种类的分散效率比紧密或分支/四辐射孢子的丝状孢子种类的分散效率高得多。这种模式与实验室实验发现的一致，该实验测试了沉积物孔径对微观世界中孢子散布的影响。此外，在流中接种并在慢滤柱中孵育的叶片显示出仅由两种组成的真菌组合，而五种在从模拟流的微观世界的叶片上占优势。这项研究的结果突出表明，低变带对水生疏水菌群落施加两种选择压力，即生理压力和对底栖孢子池的物理筛选，均导致真菌群落结构的急剧变化。

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