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Growth Dilution of Metals in Microalgal Biofilms

机译：微藻生物膜中金属的生长稀释

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Despite the key role microalgae play in introducing toxicants into aquatic food webs, little is known about the effects of environmental factors on metal accumulation by these primary producers. Environmental factors such as light and nutrients alter growth rates and may consequently influence metal concentrations in microalgae through growth dilution. Laboratory experiments suggested that metal uptake and elimination by microalgal biofilms were gradual enough to enable dilution of metals within the biofilms by photosynthetically accrued carbon, and a simple kinetic model of metal accumulation predicted significant variation in metal content due to growth dilution over the natural range of microalgal growth rates. The ratio of metal uptake to carbon uptake by microalgal biofilms decreased exponentially with increasing light in short-term laboratory experiments because photosynthesis was much more sensitive to a light gradient than was metal uptake. The effect of light on biofilm metal concentrations was confirmed in situ with a long-term experiment in which experimental shading of biofilms in a metal-contaminated stream decreased biofilm growth rates and caused a 3x increase in biofilm concentrations of twelve metals, including methylmercury. Slow growth at the primary producer level is a likely contributor to higher biotic metal concentrations in shaded, oligotrophic, or cold ecosystems.
机译：尽管微藻在将有毒物质引入水生食物网中起着关键作用，但对于这些主要生产者的环境因素对金属积累的影响知之甚少。环境因素（例如光和养分）会改变生长速率，并可能因此通过生长稀释影响微藻中的金属浓度。实验室实验表明，微藻生物膜对金属的吸收和消除要足够缓慢，以使光合作用的碳能够稀释生物膜中的金属，而简单的金属积累动力学模型预测，由于在自然范围内的生长稀释，金属含量将发生显着变化。微藻生长速率。在短期实验室实验中，微藻生物膜对金属的吸收与碳吸收的比率随光的增加呈指数下降，因为光合作用对光梯度的敏感性比对金属的吸收要敏感得多。长期实验证实了光对生物膜金属浓度的影响，在该实验中，金属污染流中生物膜的实验遮光降低了生物膜的生长速率，并使包括甲基汞在内的十二种金属的生物膜浓度增加了3倍。初级生产者水平的缓慢增长可能是阴影，贫营养或寒冷生态系统中较高的生物金属浓度的原因。

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