Suspended solid concentration reduces feeding in freshwater mussels

The Science of the Total Environment
Shaylah Tuttle-RaycraftJosef D Ackerman

Abstract

We examined the effect of TSS concentration on the clearance rates (CR) of newly transformed juvenile and adult Lampsilis fasciola, L. siliquoidea, Ligumia nasuta, and Villosa iris, as increased total suspended solids (TSS) are thought to interfere with feeding processes. Mussel CR were measured in aerated (or swirled for juveniles) chambers at TSS concentrations up to 15mgL-1 for laboratory-transformed juveniles, and up to 100mgL-1 for adult mussels. The CR of one-week old animals increased with TSS concentration, likely due to ontological differences in feeding (pedal vs. suspension feeding) and gill development, but CR decreased monotonically with TSS concentration in older animals (two-, three- and four-week old juveniles). The CR of adult mussels were significantly lower at TSS concentrations ≥8mgL-1, which represented a threshold in CR. Although this threshold occurred at similar concentrations across the four species, the decline in CR was largest in L. fasciola (46% compared to no-TSS control), and smallest in V. iris (21%). Differences among species are likely related to differences in the TSS and substrate found in their source rivers given that greater decline occurred for species in rivers with relatively lower TSS....Continue Reading

Citations

Aug 26, 2019·The Science of the Total Environment·Katherine Tran, Josef Daniel Ackerman
Nov 27, 2021·Environmental Toxicology and Chemistry·Krista RantamoPetri Ekholm

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