LIFE IN THE LIMINAL ZONE
I quite enjoyed the “Slice of Life” story—i did not realize so much was going on just below the water’s surface! It makes sense though, as activity is heightened in a liminal space, and the water’s surface is certainly the threshold between two realms. One small thing has me confused: At one point you write that the oxygen content is 5 to 10 ml/l. This unit, however, is a bit unusual. Later in the article you use mg/l, which is actually more common. Dennis Sepulveris via email
Actually, both mg/l and ml/l are acceptable notations for the oxygen content of water. The exact amount varies according to the region and the temperature and salinity of the water.