Factors Controlling Nickel Bioavailability and Effects on Benthic Invertebrates in Hardwater Freshwater Streams
Year: 2012
Type: article
Abstract: Factors Controlling Nickel Bioavailability and Effects on Benthic Invertebrates in Hardwater Freshwater Streams.Sediments in aquatic ecosystems function ecologically as habitat, food, and refugia that aid in reproduction processes, and chemically as sources and sinks for contaminants.Sediment contamination from metals and organics has been linked to numerous health and ecological effects, extending from fish consumption advisories to endangered species listings.This dissertation research examines Ni bioavailability (simultaneously extracted metal (SEM)/acid volatile sulfide (AVS) models) and toxicity in five separate studies using Ni-spiked sediments in a variety of designs, and mainly with two different sediment types (low AVS, total organic carbon (TOC), and high AVS, TOC).Two separate streamside mesocosm Ni experiments indicated that benthic communities (Ephemeroptera, abundance, taxa richness) responded negatively to increasing SEM Ni /AVS and (SEM Ni -AVS)/ƒoc models (increasing Ni bioavailability), and these communities demonstrated a sediment type preference.During a Ni-sediment flow-thru study, Ni toxicity was tested on four indigenous aquatic insects (Anthopotamus verticis, Stenonema spp., Isonychia spp., and Psephenus herricki) and two surrogate organisms (Hyalella azteca and Chironomus dilutus).Of the indigenous insects, A. verticis and Stenonema spp.were the most sensitive to Ni-spiked sediments in this study.
Author: Kevin W. Custer
Institution: Wright State University
Language: English
Subfield: Health, Toxicology and Mutagenesis
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2534707487