There’s something in the water at Lake Tahoe. The freshwater lake between California and Nevada is the clearest it’s been in decades, and researchers say that could be thanks to some tiny organisms called zooplankton. To tell us more about it, we turn to Geoffrey Schladow. He’s director of the UC Davis Tahoe Environmental Research Center. Welcome to the program. … these particular zooplankton, the Daphnia, are very indiscriminate feeders, meaning they eat everything, and they particularly eat everything that’s very small. So very fine clay particles, very small phytoplankton – they consume that. They remove it. And it’s those fine particles that are the root cause of the decline in clarity. So essentially, they’re little Roombas cleaning up the lake.