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Mean (±SE) 50% emergence time in days (EmT50) of C. riparius females (solid icons) and males (open icons) after 28 d exposure to whole sediment cores from reference (blue squares), urban (red pyramids), WWTP (orange circles), and agricultural (green diamonds) sites. The horizontal line represents the EmT50 value of the reference sediment for females (solid) and males (dashed), to which all locations were compared. Significance is indicated as **p < 0.01 and ***p < 0.001.
