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The response of life history defense of cladocerans under predation risk varies with the size and concentration of microplastics
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2021-11-27 , DOI: 10.1016/j.jhazmat.2021.127913
Qi Liu 1 , Leihong Liu 1 , Jing Huang 1 , Lei Gu 1 , Yunfei Sun 1 , Lu Zhang 1 , Kai Lyu 1 , Zhou Yang 1
Affiliation  

Microplastics are an emerging and increasingly serious pollutant in freshwater environment, which have become a threat to freshwater organisms. However, whether microplastics interfere with the responses of organisms to their predators is still unclear. In this study, we investigated the effects of microplastics with tiny different particle size (diameter: 0.7 and 1 μm) on the anti-predation (Rhodeus ocellatus as the predator) defense responses of different body-sized cladocerans, Daphnia pulex and Moina macrocopa. Results showed that microplastics had a size-based inhibitory effect on the induced defense of both D. pulex and M. macrocopa. Specifically, 0.7 μm microplastics had stronger effects on reduced survival time, delayed maturation time, and decreased offspring numbers. In addition, the effects of microplastics also varied with different body-sized cladocerans, i.e. medium-sized cladoceran (D. pulex) were more sensitive than the small-sized one (M. macrocopa) regarding the maturation time. This study illustrated for the first time that the effect of microplastics on induced defense was related to cladoceran species and microplastics size, and further revealed the extensive negative effects of microplastics from the perspective of interspecific relationship.



中文翻译:

枝角类动物在捕食风险下的生活史防御反应随微塑料的大小和浓度而变化

微塑料是淡水环境中一种新兴且日益严重的污染物,已成为对淡水生物的威胁。然而,微塑料是否会干扰生物体对其捕食者的反应仍不清楚。在这项研究中,我们研究了具有微小不同粒径(直径:0.7 和 1 μm)的微塑料对不同体型枝角类动物、水蚤Moina macrocopa的反捕食( Rhodeus ocellatus作为捕食者)防御反应的影响。结果表明,微塑料对D. pulexM. macrocopa的诱导防御具有基于尺寸的抑制作用. 具体而言,0.7 μm 微塑料对减少存活时间、延迟成熟时间和减少后代数量有更强的影响。此外,微塑料对不同体型枝角类动物的影响也不同,即中型枝角类动物(D. pulex )对成熟时间的敏感性高于小型枝角类动物(M. macrocopa )。本研究首次阐明微塑料对诱导防御的影响与枝角类物种和微塑料大小有关,并从种间关系的角度进一步揭示了微塑料的广泛负面影响。

更新日期:2021-11-28
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