John Wiley & Sons, Ltd.

Macroinvertebrate responses to nickel in multi‐system exposures

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Metals introduced to sediments undergo a variety of complexation and partitioning changes that affect metal bioavailability. We examined nickel (Ni) toxicity and bioavailability (simultaneously extracted metal (SEM)/acid volatile sulfide (AVS) and organic carbon (foc) models) in two field studies (using streamside mesocosm and in situ colonization) and one laboratory study. The streamside mesocosm experiments indicated benthic communities (Ephemeroptera, abundance, and taxa richness) responded negatively to increasing SEMNi/AVS and (SEMNi‐AVS)/foc models. The in situ colonization study showed taxa richness, abundance, and EPT taxa decreased with increasing SEMNi and SEMNi/AVS values. Ni‐spiked sediments were tested in the laboratory with indigenous field‐collected mayflies (Anthopotamus verticis, Isonychia spp. and Stenonema spp) and a beetle (Psephenus herricki), and with laboratory‐cultured Hyalella azteca and Chironomus dilutus. The amphipod H. azteca was the most sensitive organism tested, and the mayflies Anthopotamus verticis and Stenonema spp. were the most sensitive indigenous organisms to Ni‐spiked sediments. These studies help discern which factors are important in determining Ni toxicity and bioavailability at the individual, population, and community levels. This article is protected by copyright. All rights reserved

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