Our Coral Clocks

The sun, moon and stars have provided us with the means to mark seasons, a system we call time. Dr Anjani Ganase considers the rhythm of biological clocks in the ocean. Telling time is basic and integral to all life on Earth. All biological functions of growth, reproduction, regulation, movement are predicated on the planet’s orbit around the sun and the spin of the earth about its axis by which we track time. For us humans, we’ve studied and documented day/ night cycles, lunar and seasonal cycles that see corresponding changes in temperature, weather and other environmental or biological cues (sandflies at dusk) that influence food availability, survival of offspring, health and anything essential for survival. At sea, telling time is tied to navigation and exploration, as we track the movements and positions of the sun, stars and the moon across the sky. Tidal changes are observed for fishing, and even coastal defence. Our time tracking skills improved an...