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首页> 外文期刊>Hydrobiologia >Local and regional environmental factors drive the spatial distribution of phototrophic biofilm assemblages in Mediterranean streams
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Local and regional environmental factors drive the spatial distribution of phototrophic biofilm assemblages in Mediterranean streams

机译：本地和区域环境因素驱动地中海流中的光营养生物膜组合的空间分布

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摘要

Temporary streams are submitted to high seasonal hydrological variations which induce habitat fragmentation. Global change promotes longer non-flow periods, affecting hydrological continuity and the distribution of biological assemblages in river networks. We aimed to investigate the effects of hydrological discontinuity on phototrophic biofilm assemblages in a Mediterranean stream, at both network and habitat scales. At the network scale during basal flow conditions, mostly nitrate and DOC concentrations were associated to the taxonomical and trait distribution of algae and cyanobacterial assemblages. Cyanobacteria dominated at the upstream and downstream sites of the network, while green algae and diatoms were abundant in its middle part. At the habitat scale, hydrological discontinuity promoted large changes in biofilm composition between riffles and pools, where pools were inhabited preferentially by green algae and riffle habitats by cyanobacteria. Our findings emphasize the myriad of factors affecting the spatial distribution of phototrophic biofilms, which become more heterogeneous according to water flow interruption. Under the predicted climate change scenarios, spatial heterogeneity in temporary streams may increase, which will lead to change phototrophic biofilm assemblages.
机译：临时流提交给高季节性水文变异，诱发栖息地碎片。全球变化促进了较长的非流动期，影响水文连续性和河流网络中生物组合的分布。我们旨在探讨水文不连续性对地中海流中的光养生物膜组合的影响，在两个网络和栖息地鳞片中。在基础流动条件下的网络规模，大多数硝酸盐和DOC浓度与藻类和蓝藻组合的分类和性状分布相关。 Cyanobacteria在网络的上游和下游部位主导，而绿藻和硅藻在其中间部分丰富。在栖息地规模，水文不连续性促进了Riffles和游泳池之间的生物膜组成的大变化，其中池通过青霉菌优先通过绿藻和Riffle栖息地居住。我们的研究结果强调了影响光营养生物膜的空间分布的无数因素，这根据水流中断变得更加异质。在预测的气候变化场景下，临时流中的空间异质性可能会增加，这将导致光营养生物膜组合。

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