Behavioral and Physiological Changes in Daphnia magna when Exposed to Nanoparticle Suspensions (Titanium Dioxide, Nano-C60, and C60HxC70Hx)

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• 作者：Sarah B. Lovern ; J. Rudi Strickler ; Rebecca Klaper
• 刊名：Environmental Science & Technology
• 出版年：2007
• 出版时间：June 15, 2007
• 年：2007
• 卷：41
• 期：12
• 页码：4465 - 4470
• 全文大小：140K
• 年卷期：v.41,no.12(June 15, 2007)
• ISSN：1520-5851

文摘

Little is known about the impact manufactured nanoparticleswill have on aquatic organisms. Previously, we demonstrated that toxicity differs with nanoparticle type andpreparation and observed behavioral changes upon exposureto the more lethal nanoparticle suspensions. In thisexperiment, we quantified these behavioral and physiologicalresponses of Daphnia magna at sublethal nanoparticleconcentrations. Titanium dioxide (TiO₂) and fullerenes (nano-C₆₀) were chosen for their potential use in technology.Other studies suggest that addition of functional groupsto particles can affect their toxicity to cell cultures, but itis unknown if the same is true at the whole organismlevel. Therefore, a fullerene derivative, C₆₀HxC₇₀Hx, wasalso used to examine how functional groups affect Daphniaresponse. Using a high-speed camera, we quantifiedseveral behavior and physiological parameters includinghopping frequency, feeding appendage and postabdominalcurling movement, and heart rate. Nano-C₆₀ was theonly suspension to cause a significant change in heartrate. Exposure to both nano-C₆₀ and C₆₀HxC₇₀Hx suspensionscaused hopping frequency and appendage movement toincrease. These results are associated with increased riskof predation and reproductive decline. They indicate thatcertain nanoparticle types may have impacts on populationand food web dynamics in aquatic systems.