Short-term exposure to gold nanoparticle suspension impairs swimming behavior in a widespread calanoid copepod

Environmental Pollution
François-Gaël MichalecS Souissi

Abstract

Calanoid copepods play an important role in the functioning of marine and brackish ecosystems. Information is scarce on the behavioral toxicity of engineered nanoparticles to these abundant planktonic organisms. We assessed the effects of short-term exposure to nonfunctionalized gold nanoparticles on the swimming behavior of the widespread estuarine copepod Eurytemora affinis. By means of three-dimensional particle tracking velocimetry, we reconstructed the trajectories of males, ovigerous and non-ovigerous females. We quantified changes in their swimming activity and in the kinematics and geometrical properties of their motion, three important descriptors of the motility patterns of zooplankters. In females, exposure to gold nanoparticles in suspension (11.4 μg L(-1)) for 30 min caused depressed activity and lower velocity and acceleration, whereas the same exposure caused minimal effects in males. This response differs clearly from the hyperactive behavior that is commonly observed in zooplankters exposed to pollutants, and from the generally lower sensitivity of female copepods to toxicants. Accumulation of gold nanoparticles on the external appendages was not observed, precluding mechanical effects. Only very few nanopartic...Continue Reading

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Nov 23, 2017·Chemical Communications : Chem Comm·Zhen LiYong Qian
Mar 13, 2019·Food Chemistry·Jérôme CléachPhilippe Lencel
Sep 2, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·María Florencia GutierrezJimena Cazenave

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