Researchers found that a common species of zooplankton, Daphnia pulex, adapts to increasing levels of road salt, and that that this exposure affected the circadian rhythm, reports Alternet.

Every winter, local governments across the United States apply millions of tons of road salt to keep streets navigable during snow and ice storms. Runoff from melting snow carries road salt into streams and lakes, and causes many bodies of water to have extraordinarily high salinity.

At Rensselaer Polytechnic Institute, my colleague Rick Relyea and his lab are working to quantify how increases in salinity affect ecosystems. Not surprisingly, they have found that high salinity has negative impacts on many species. They have also discovered that some species have the ability to cope with these increases in salinity.