Fig. 7

Snapshot of evidence atlas displaying the geographical distribution of field studies. The two studies placed in the Atlantic Ocean lack coordinates. As regards the yellow and green dots with numbers, the colours do not indicate a specific study type. Yellow dots with numbers contain more than 10 studies that appear while clicking on it in the html-based version; green dots contain 2–9 studies that appear while clicking on it. (Yellow dots without a number indicate a single surface water study.)