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首页> 外文期刊>Freshwater science >Alteration of Chironomus plumosus ventilation activity and bioirrigation-mediated benthic fluxes by changes in temperature, oxygen concentration, and seasonal variations
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Alteration of Chironomus plumosus ventilation activity and bioirrigation-mediated benthic fluxes by changes in temperature, oxygen concentration, and seasonal variations

机译：温度，氧气浓度和季节性变化的变化，导致Chironomus plumosus通风活动和生物灌溉介导的底流通量的变化

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Abstract. Burrowing benthic organisms promote water and solute fluxes across the sediment-water interface. Water and solutes penetrate the burrow walls and are transported into/out of the sediment when organisms flush their burrows with overlying water. Few studies have been done to investigate bioirrigation under shifting environmental conditions. We experimentally quantified bioirrigation by Chironomus plumosus larvae in the laboratory at 3 ranges of O_2 saturation (low, medium, and high O_ 2 concentrations), 2 temperatures (10 and 20℃), and over different seasons. We measured ventilation activities with O_2 and flow-velocity microsensors, flow velocities during pumping periods with color tracers, pumping rates with conductivity exchange experiments, and rates of advective and diffusive water influx into the sediment by influx assays (NaCl was the tracer in both latter experiments). O_2 saturations <12% extended pumping durations/h, whereas saturations <3% decreased pumping durations to ～O. Flow velocities were 2× higher when O_2 saturation was >50% than when i t was <10%. Rising temperatures altered larval pumping (higher pumping frequency, lower pumping length) and increased flow velocity. Hence, pumping rate and rates of water influx were significantly higher at 20 than at 10℃. Seasonal variations in bioirrigation occurred despite constant laboratory conditions, i.e., the rate of water influx was significantly higher in spring/summer than in autumn. Our study shows that temporally varying environmental conditions should be considered when evaluating bioirrigation-mediated benthic fluxes across the sediment-water interface.
机译：抽象。挖掘底栖生物促进了水和溶质通量穿过沉积物-水界面。当有机物用上覆水冲洗洞穴时，水和溶质会渗入洞穴壁，并被运入/运出沉积物。很少有研究在变化的环境条件下研究生物灌溉。在实验室中，我们在3种O_2饱和度（低，中和高O_2浓度），2种温度（10和20℃）以及不同季节下，对Chironomus plumosus幼虫的生物灌溉进行了实验量化。我们使用O_2和流速微传感器测量了通风活动，使用示踪剂测量了泵送期间的流速，通过电导率交换实验测量了泵送速率，并通过流入分析法测定了平流和扩散水流入沉积物中的速率（NaCl都是这两种方法中的示踪剂实验）。 O_2饱和度<12％延长了抽水持续时间/ h，而饱和度<3％减少了抽水持续时间至〜O。当O_2饱和度> 50％时，流速比i t <10％时高2倍。温度升高改变了幼虫的抽水（抽水频率更高，抽水长度较短）和流速的增加。因此，在20℃时的抽水速率和水涌入速率显着高于在10℃时。尽管实验室条件不变，但生物灌溉的季节变化仍然存在，即春季/夏季的入水率明显高于秋季。我们的研究表明，评估沉积物-水界面上的生物灌溉介导的底流时，应考虑随时间变化的环境条件。

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