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Harmful effect of nanoparticles on the functions of freshwater ecosystems: Insight into nanoZnO-polluted stream.

Identifieur interne : 000919 ( Main/Exploration ); précédent : 000918; suivant : 000920

Harmful effect of nanoparticles on the functions of freshwater ecosystems: Insight into nanoZnO-polluted stream.

Auteurs : Jingjing Du [République populaire de Chine] ; Yuyan Zhang [République populaire de Chine] ; Ruilin Guo [République populaire de Chine] ; Fanxiao Meng [République populaire de Chine] ; Yucong Gao [République populaire de Chine] ; Chuang Ma [République populaire de Chine] ; Hongzhong Zhang [République populaire de Chine]

Source :

RBID : pubmed:30300841

Descripteurs français

English descriptors

Abstract

ZnO nanoparticle toxicity on aquatic organisms has been extensively studied, but its concentration-and time-dependent effects on ecosystem functioning are remain uncertain. Here we assessed the harmful effects of nano-ZnO (10, 100, 1000 mg L-1) on the stream functioning by using a microcosm system simulating poplar leaf decomposition for 50 days. The 100 mg L-1 ZnO nanoparticles had significantly and stably inhibitory effect on the litter decomposition during the exposure period. The inhibition was not detected in the 10 mg L-1 treatment until 43 d. In contrast, the significant and continuous inhibition started to disappear from 43 d in the 1000 mg L-1 treatment. The varied consequences on litter decomposition might be directly affected by the different ZnO nanoparticle homogeneity of the different treatments. ZnO nanoparticles led to significant decreases in pH value of the decomposition environment, which had significant and positive relationships to the activities of dehydrogenase, glycine-aminopeptidase, N-acetylglucosaminidase, and acid phosphatase. Besides, 10 and 1000 mg L-1 ZnO nanoparticles led to lower fungal diversity, which was negatively related to the variability of decomposition. In conclusion, fungal decomposers showed different responses to the different concentrations of ZnO nanoparticle, and ultimately affected the stability of ecosystem functions.

DOI: 10.1016/j.chemosphere.2018.09.171
PubMed: 30300841


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">ZnO nanoparticle toxicity on aquatic organisms has been extensively studied, but its concentration-and time-dependent effects on ecosystem functioning are remain uncertain. Here we assessed the harmful effects of nano-ZnO (10, 100, 1000 mg L
<sup>-1</sup>
) on the stream functioning by using a microcosm system simulating poplar leaf decomposition for 50 days. The 100 mg L
<sup>-1</sup>
ZnO nanoparticles had significantly and stably inhibitory effect on the litter decomposition during the exposure period. The inhibition was not detected in the 10 mg L
<sup>-1</sup>
treatment until 43 d. In contrast, the significant and continuous inhibition started to disappear from 43 d in the 1000 mg L
<sup>-1</sup>
treatment. The varied consequences on litter decomposition might be directly affected by the different ZnO nanoparticle homogeneity of the different treatments. ZnO nanoparticles led to significant decreases in pH value of the decomposition environment, which had significant and positive relationships to the activities of dehydrogenase, glycine-aminopeptidase, N-acetylglucosaminidase, and acid phosphatase. Besides, 10 and 1000 mg L
<sup>-1</sup>
ZnO nanoparticles led to lower fungal diversity, which was negatively related to the variability of decomposition. In conclusion, fungal decomposers showed different responses to the different concentrations of ZnO nanoparticle, and ultimately affected the stability of ecosystem functions.</div>
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<sup>-1</sup>
) on the stream functioning by using a microcosm system simulating poplar leaf decomposition for 50 days. The 100 mg L
<sup>-1</sup>
ZnO nanoparticles had significantly and stably inhibitory effect on the litter decomposition during the exposure period. The inhibition was not detected in the 10 mg L
<sup>-1</sup>
treatment until 43 d. In contrast, the significant and continuous inhibition started to disappear from 43 d in the 1000 mg L
<sup>-1</sup>
treatment. The varied consequences on litter decomposition might be directly affected by the different ZnO nanoparticle homogeneity of the different treatments. ZnO nanoparticles led to significant decreases in pH value of the decomposition environment, which had significant and positive relationships to the activities of dehydrogenase, glycine-aminopeptidase, N-acetylglucosaminidase, and acid phosphatase. Besides, 10 and 1000 mg L
<sup>-1</sup>
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<country>
<li>République populaire de Chine</li>
</country>
</list>
<tree>
<country name="République populaire de Chine">
<noRegion>
<name sortKey="Du, Jingjing" sort="Du, Jingjing" uniqKey="Du J" first="Jingjing" last="Du">Jingjing Du</name>
</noRegion>
<name sortKey="Gao, Yucong" sort="Gao, Yucong" uniqKey="Gao Y" first="Yucong" last="Gao">Yucong Gao</name>
<name sortKey="Guo, Ruilin" sort="Guo, Ruilin" uniqKey="Guo R" first="Ruilin" last="Guo">Ruilin Guo</name>
<name sortKey="Ma, Chuang" sort="Ma, Chuang" uniqKey="Ma C" first="Chuang" last="Ma">Chuang Ma</name>
<name sortKey="Meng, Fanxiao" sort="Meng, Fanxiao" uniqKey="Meng F" first="Fanxiao" last="Meng">Fanxiao Meng</name>
<name sortKey="Zhang, Hongzhong" sort="Zhang, Hongzhong" uniqKey="Zhang H" first="Hongzhong" last="Zhang">Hongzhong Zhang</name>
<name sortKey="Zhang, Yuyan" sort="Zhang, Yuyan" uniqKey="Zhang Y" first="Yuyan" last="Zhang">Yuyan Zhang</name>
</country>
</tree>
</affiliations>
</record>

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