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首页> 外文期刊>Aquatic Sciences >Microbially-mediated indirect effects of silver nanoparticles on aquatic invertebrates
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Microbially-mediated indirect effects of silver nanoparticles on aquatic invertebrates

机译：纳米银对水生无脊椎动物的微生物间接影响

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摘要

Complex natural systems are affected by multiple anthropogenic stressors, and therefore indirect effects within food webs are increasingly investigated. In this context, dead organic matter (OM) or detritus provides a food source sustaining detrital food webs that recycle the retained energy through microbial decomposition and invertebrate consumption. In aquatic environments, poorly water-soluble contaminants, including nanoparticles (NPs), quickly adsorb onto OM potentially modifying OM-associated microbial communities. Since invertebrates often depend on microbial conditioning to enhance OM quality, adverse effects on OM-associated microbial communities could potentially affect invertebrate performances. Therefore, this study assessed the effect ofenvironmentally relevant concentrations of the model emerging contaminant, silver nanoparticles (AgNPs), on OM-associated microorganisms and subsequent indirect effects on growth of the invertebrate Asellus aquaticus. At low concentrations (0.8 ug/L), AgNPs inhibited activity and altered metabolic diversity of the OM-associated microbial community. This was observed to coincide with a negative effect on the growth of A. aquaticus due to antimicrobial properties, as a decreased growth was observed when offered AgNP-contaminated OM. When A. aquaticus were offered sterile OM in the absence of AgNPs, invertebrate growth was observed to be strongly retarded, illustrating the importance of microorganisms in the diet of this aquatic invertebrate. This outcome thus hints that environmentally relevant concentrations of AgNPs can indirectly affect the growth of aquatic invertebrates by affecting OM-associated microbial communities, and hence that microorganisms are an essential link in understanding bottom-up directed effects of chemical stressors in food webs.
机译：复杂的自然系统受到多种人为压力的影响，因此越来越多地研究了食物网内的间接影响。在这种情况下，死有机物（OM）或碎屑提供了维持碎屑食物网的食物来源，碎屑食物网通过微生物的分解和无脊椎动物的消耗来回收残留的能量。在水生环境中，水溶性差的污染物（包括纳米颗粒（NPs））会迅速吸附到OM上，从而可能会改变与OM相关的微生物群落。由于无脊椎动物通常依靠微生物调节来提高OM质量，因此对与OM相关的微生物群落的不利影响可能会影响无脊椎动物的性能。因此，这项研究评估了环境相关浓度的模型新兴污染物银纳米颗粒（AgNPs）对OM相关微生物的影响以及对无脊椎动物Asellus aquaticus生长的间接影响。在低浓度（0.8 ug / L）下，AgNPs抑制OM相关微生物群落的活性并改变其代谢多样性。由于提供了受NPNP污染的OM，观察到这与由于抗菌特性而对水生曲霉的生长产生不利影响相吻合。当在没有AgNPs的情况下向水曲霉提供无菌OM时，观察到无脊椎动物的生长受到强烈阻碍，这说明了微生物在该水生无脊椎动物的饮食中的重要性。因此，该结果表明，与环境相关的AgNPs浓度可通过影响与OM相关的微生物群落而间接影响水生无脊椎动物的生长，因此，微生物是理解食物网中化学应激素自下而上的直接作用的重要环节。

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