Contaminant exposure effects in a changing climate: how multiple stressors can multiply exposure effects in the amphipod Hyalella azteca

Ecotoxicology
Simone HasenbeinRichard E Connon

Abstract

Global climate change (GCC) is likely to intensify the synergistic effects between altered physicochemical parameters [of changing habitats] and other anthropogenic threats, such as water pollution, posing increased risks to aquatic biodiversity. As such, it is critical to understand how organisms will respond to changes in water temperature and salinity in the presence of contaminants. We exposed the epibenthic amphipod Hyalella azteca to a 3 × 3 factorial treatment design of three temperatures and three salinities ranging from 12 to 18 °C and 0 to 8 parts per thousand (ppt), respectively, in combination with a low-level environmentally relevant concentration of the pyrethroid insecticide bifenthrin (1 ng/L). Effects on survival and swimming behavior were evaluated after 96 h exposure. Transcription of a select suite of genes was monitored at 24, 48, and 96 h using quantitative polymerase chain reaction (qPCR). Our results not only demonstrate that the changes in salinity and temperature result in negative effects to invertebrate survival, behavior, and gene response, but that the effects were significantly more pronounced in the presence of bifenthrin. This is particularly important since greater thermal fluctuations, changes...Continue Reading

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Citations

Jul 31, 2019·Environmental Toxicology and Chemistry·Anne FairbrotherBryan W Brooks
Sep 18, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Chi-Chang ChangJer-Yiing Houng
Sep 11, 2020·The Science of the Total Environment·Corie A FultonMichael J Lydy
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May 5, 2021·Biological Reviews of the Cambridge Philosophical Society·João Paulo S PinheiroCharles R Tyler
Aug 2, 2019·Environmental Science & Technology·Allison R TaylorJay Gan

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