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qPCR results of selected genes from lakes with varying urban impact: TannersRDase, PelicanRDase, CarverHaDhg, and TannersHaDhg. The lakes are ordered according to increasing median salt concentration (Supplementary Table S1) as a measure of urban impact, with Square Lake as the least impacted and Como Lake as the most impacted. All measurements are shown in units of log gene copy per gram sediment.
