John Wiley & Sons, Ltd.

Toxicity of sediments from lead‐zinc mining areas to juvenile freshwater mussels (Lampsilis siliquoidea), compared to standard test organisms

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Sediment toxicity tests compared chronic effects on survival, growth, and biomass of juvenile freshwater mussels (28‐d exposures with Lampsilis siliquoidea) to responses of standard test organisms, amphipods (28‐d exposures with Hyalella azteca) and midges (10‐d exposures with Chironomus dilutus), in sediments from two lead‐zinc mining areas: Tri‐State mining district and Southeast Missouri (SEMO) mining district. Mussel tests were conducted in sediments sieved to <0.25 mm to facilitate recovery of juvenile mussels (2 to 4 mo. old). Sediments were contaminated primarily with lead, zinc, and cadmium, with greater zinc and cadmium concentrations in Tri‐State sediments and greater lead concentrations in SEMO sediments. The frequency of highly toxic responses (reduced 10% or more relative to reference sites) in Tri‐State sediments was greatest for amphipod survival (25% of samples), midge biomass (20%), and mussel survival (14%). In SEMO sediments, the frequency of highly toxic samples was greatest for mussel biomass (25%) and amphipod biomass (13%). Thresholds for metal toxicity to mussels, expressed as hazard quotients based on probable effect concentrations, were lower for SEMO sediments than for Tri‐State sediments. SEMO sites with toxic sediments had 2 or fewer live mussel taxa in a concurrent mussel population survey, compared to 7–26 taxa at reference sites. These results demonstrate that sediment toxicity tests with juvenile mussels can be reliably conducted using modifications of existing standard methods; that the sensitivity of mussels to metals can be similar to or greater than standard test organisms; and that responses of mussels in laboratory toxicity tests are consistent with effects on wild mussel populations. This article is protected by copyright. All rights reserved

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