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Strong and recurring seasonality revealed within stream diatom assemblages

机译:河流硅藻组合中显示出强烈且反复出现的季节性

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Improving stream water quality in agricultural landscapes is an ecological priority and a legislative duty for many governments. Ecosystem health can be effectively characterised by organisms sensitive to water quality changes such as diatoms, single-celled algae that are a ubiquitous component of stream benthos. Diatoms respond within daily timescales to variables including light, temperature, nutrient availability and flow conditions that result from weather and land use characteristics. However, little consideration has been given to the ecological dynamics of diatoms through repeated seasonal cycles when assessing trajectories of stream function, even in catchments actively managed to reduce human pressures. Here, six years of monthly diatom samples from three independent streams, each receiving differing levels of diffuse agricultural pollution, reveal robust and repeated seasonal variation. Predicted seasonal changes in climate-related variables and anticipated ecological impacts must be fully captured in future ecological and water quality assessments, if the apparent resistance of stream ecosystems to pollution mitigation measures is to be better understood.
机译:改善农业景观中的溪流水质是生态优先事项,也是许多政府的立法职责。生态系统健康的特征可以是对水质变化敏感的生物,例如硅藻,单细胞藻类,它们是河底河底生物的普遍成分。硅藻在日常时间范围内对变量(包括光照,温度,养分可利用性和由天气和土地利用特征引起的流动条件)作出响应。但是,在评估河流功能的轨迹时,即使在积极设法减轻人类压力的集水区中,硅藻的生态动力学也没有通过重复的季节性周期加以考虑。在这里,六个月的硅藻样品来自三个独立的河流,每个河流接受不同水平的弥散性农业污染,显示出强劲且反复的季节变化。如果要更好地了解河流生态系统对减轻污染措施的明显抵抗力,则必须在未来的生态和水质评估中充分考虑与气候有关的变量的预测季节性变化和预期的生态影响。

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