Food quantity affects the sensitivity of Daphnia to road salt

Environmental Science & Technology
Arran H Brown, Norman D Yan

Abstract

Road deicing operations have raised chloride (Cl) levels in many temperate lakes in Europe and North America. These lakes vary widely in trophic status, but to date, no one has quantified the interaction between food quantity and road salt toxicity. We examined the effects of food quantity (particulate algal C concentration (C)) on the chronic toxicity of Cl to Daphnia in soft-water bioassays. There was a strong positive linear relationship (r(2) = 0.92 for NaCl and r(2) = 0.96 for CaCl2) between food quantity and Cl LC50. As food quantity increased from 0.2 to 1.0 mg C/L (levels characteristic of oligotrophic to eutrophic lakes, respectively), the chronic Cl LC50 increased from 55.7 to 284.8 mg Cl/L. Salt type (NaCl or CaCl2) did not affect the Cl LC50, Daphnia life history parameters, or the intrinsic rate of population increase (r). The life history parameter most sensitive to Cl was neonate production. Cl did not inhibit egg production, nor was the maternal lipid investment in eggs changed, but egg viability and the subsequent release of live neonates decreased as Cl levels increased and food decreased. Our results suggest the trophic status of lakes should be considered when assessing ecological threat from Cl.

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Citations

Mar 17, 2016·ACS Chemical Neuroscience·Nathaniel S Woodling, Katrin I Andreasson
Apr 15, 2016·Environmental Science & Technology·Sarah H LedfordJohn C Stella
Aug 26, 2016·Environmental Science and Pollution Research International·Séverine Le FaucheurVera I Slaveykova
Apr 12, 2017·Proceedings of the National Academy of Sciences of the United States of America·Hilary A DuganKathleen C Weathers
Jan 26, 2021·The Science of the Total Environment·Jana Isanta-NavarroDominik Martin-Creuzburg
Aug 17, 2018·Environmental Science & Technology·Guilherme JeremiasJana Asselman
Oct 20, 2018·Environmental Science & Technology·Darcy L BirdJoel Moore
Jul 1, 2020·Environmental Science & Technology·Shelley E ArnottJames A Rusak
Sep 3, 2019·The Science of the Total Environment·G S AraujoS Loureiro

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