Lethal and sublethal responses of native mussels (Unionidae: Lampsilis siliquoidea and L. higginsii) to elevated carbon dioxide

Canadian Journal of Fisheries and Aquatic Sciences
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Abstract

Levels of carbon dioxide (CO2) that have been proposed for aquatic invasive species (AIS) control [24 000 – 96 000 µatm partial pressure CO2 (PCO2); 1 atm = 101.325 kPa] were tested on juvenile mussels, the Fatmucket (Lampsilis siliquoidea) and the U.S. federally endangered Higgins Eye (L. higginsii). A suite of responses (survival, growth, behavior, and gene expression) were measured after 28-d exposure and 14-d postexposure to CO2. The 28-d LC20 (lethal concentration to 20%) was lower for L. higginsii (31 800 µatm PCO2, 95% confidence interval (CI) 15 000 – 42 800 µatm) than for L. siliquoidea (58 200 µatm PCO2, 95% CI 45 200 – 68 100 µatm). Treatment-related reductions occurred in all measures of growth and condition. Expression of chitin synthase, key for shell formation, was down-regulated at 28-d exposure. Carbon dioxide caused narcotization and unburial of mussels, behaviors that could increase mortality by predation and displacement. We conclude that survival and growth of juvenile mussels could be reduced by continuous exposure to elevated CO2, but recovery may be possible in shorter duration exposure.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Lethal and sublethal responses of native mussels (Unionidae: Lampsilis siliquoidea and L. higginsii) to elevated carbon dioxide
Series title Canadian Journal of Fisheries and Aquatic Sciences
DOI 10.1139/cjfas-2017-0543
Edition Online First
Year Published 2018
Language English
Publisher NRC Research Press
Contributing office(s) Upper Midwest Environmental Sciences Center