Fig. 4: Density (A) and abundance (B) of all fishes surveyed within the Hanauma Bay Nature Preserve, O‘ahu, Hawai‘i combined as a function of long-term and instantaneous human presence, respectively.
From: COVID-19 anthropause affects coral reef ecosystems through biophysical changes
Data in A are fishes per m2 only at the highest-impact site (Keyhole) within the bay over the three study periods. Shaded areas represent the smoothed kernel density estimate with mean (large black point) and minimum and maximum values ±1.5 * IQR (inter-quartile range), respectively (vertical black bars). Points are jittered along the x-axis to improve visibility. Data in B are the number of fish counted within the cameras’ field of view (FOV; 5.6 m wide × 3 m deep) per second across all sites before, during, and after human snorkelers entered the FOV. Boxes represent minimum and maximum values ±1.5 * IQR, respectively, and the notch displays a confidence interval around the median. Points are jittered along x- and y-axes to improve visibility.
