Widespread variation in salt tolerance within freshwater zooplankton species reduces the predictability of community-level salt tolerance

Shelley E. Arnott, Vincent Fugère, Celia C. Symons, Stephanie J. Melles, Beatrix E. Beisner, Miguel Cañedo-Argüelles, Marie Pier Hébert, Jennifer A. Brentrup, Amy L. Downing, Derek K. Gray, Danielle Greco, William D. Hintz, Alexandra McClymont, Rick A. Relyea, James A. Rusak, Catherine L. Searle, Louis Astorg, Henry K. Baker, Zeynep Ersoy, Carmen EspinosaJaclyn M. Franceschini, Angelina T. Giorgio, Norman Göbeler, Emily Hassal, Mercedes Huynh, Samuel Hylander, Kacie L. Jonasen, Andrea Kirkwood, Silke Langenheder, Ola Langvall, Hjalmar Laudon, Lovisa Lind, Maria Lundgren, Emma R. Moffett, Lorenzo Proia, Matthew S. Schuler, Jonathan B. Shurin, Christopher F. Steiner, Maren Striebel, Simon Thibodeau, Pablo Urrutia Cordero, Lidia Vendrell-Puigmitja, Gesa A. Weyhenmeyer, Alison M. Derry

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The salinization of freshwaters is a global threat to aquatic biodiversity. We quantified variation in chloride (Cl) tolerance of 19 freshwater zooplankton species in four countries to answer three questions: (1) How much variation in Cl tolerance is present among populations? (2) What factors predict intraspecific variation in Cl tolerance? (3) Must we account for intraspecific variation to accurately predict community Cl tolerance? We conducted field mesocosm experiments at 16 sites and compiled acute LC50s from published laboratory studies. We found high variation in LC50s for Cl tolerance in multiple species, which, in the experiment, was only explained by zooplankton community composition. Variation in species-LC50 was high enough that at 45% of lakes, community response was not predictable based on species tolerances measured at other sites. This suggests that water quality guidelines should be based on multiple populations and communities to account for large intraspecific variation in Cl tolerance.

Original languageEnglish
Pages (from-to)8-18
Number of pages11
JournalLimnology And Oceanography Letters
Issue number1
StatePublished - Feb 2023


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