Figure 4 : Degradation curves of a. extracellular eDNA
and b. intracellular eDNA under UV solar radiation treatments, as
determined from non-linear least squares. In b. the red line represents
the full-sun treatment, the black line the half-sun treatment, and the
blue line the full-shade treatment. In both a. and b. the red tick marks
on the x-axis represent the 24-hour intervals used throughout the
experiment. Cumulative UV represents the total UV radiation from both
UV-A and UV-B. Dashed lines represent the set detection thresholds, with
the upper threshold set to 1.45 x 107 copies and the
lower threshold set to 7.24 x 106 copies. A small
amount of noise (‘jittering’) was added to the x-coordinate of the data
points to improve visibility.