FIGURE 12.

(A) Observed abundances in fish populations from the harbour of Sydney (Australia) under a 12L/12D cycle plotted in 15 min bins. Under the natural LD cycle the number of fish is higher during night (black line) than during day (blue line); they were sedentary at night with low predation activity (P↓), while displaying a predatory behaviour during day (P↑). ALAN (40-50 lx, warm LED light), transformed the nocturnal pattern into a diurnal one. Modified and adapted from Bolton et al. (2017). (B) Orientation response of 4 species of sea turtles hatchlings to coloured light sources. Olive Ridley Sea Turtle Lepidochelys olivacea, Green Sea Turtle Chelonia mydas, Hawksbill Sea Turtle Eretmochelys imbricata, were attracted when illuminated with UV-A to yellow wavelengths. The Loggerhead Sea Turtle Caretta differed in that UV-A to green lights were attractive, but yellow wavelengths were repulsive, an effect reversed by red illumination. For details see (Witherington and Martin, 2003) from which the figure was modified and adapted.