You’ve probably noticed that stuff is really expensive these days. And one of the most expensive things is staying warm (as I type this I’m wearing two jumpers, a scarf and gloves, and I have an extra-long hot water bottle wrapped round me – still cold though). Thanks to soaring energy prices, we’ve all had to become psychrophilic.
As you’ve probably guessed, psychrophilic is a scientific term for organisms that love living in cold environments – think glaciers, deep-sea trenches and the like. They’re usually bacteria, fungi, microbes and other tiny little critters like that.
‘Psychrophilic’ first turned up as a scientific term in the early 20th century. It’s a combination of two Greek words – ‘psychros’ meaning ‘cold’ and ‘philos’ meaning ‘loving’. Sometimes etymology really isn’t rocket science.
The opposite of psychrophilic is, of course, thermophilic. These heat-loving organisms thrive in temperatures above 45°C. Psychrophilic and thermophilic organisms are often also extremophiles, another former word of the week.
Psychrophilic organisms are super helpful to science. Here are a couple of examples:
colwellia psychrerythraea: a bacterium found in the deep sea, particularly in the Arctic and Antarctic. It produces proteins that stay active at really low temperatures, which is handy for things like food preservation
pseudoalteromonas haloplanktis: this is another type of bacterium which also thrives in the Antarctic. It’s studied for its enzymes, which we use to clean clothes in cold water
Antarctic krill: this tiny shrimp-like crustacean also lives in the freezing waters around Antarctica. It’s what’s known as a keystone species, which means it plays a critical role in maintaining the structure and balance of its ecosystem. Without this unassuming little creature, the Southern Ocean ecosystem would be completely devastated, as would the wider environment. The best things really do come in small packages. (Oh, and just to end on a positive note, you’ll be pleased to hear that Antarctic krill is one of the few species in the world that isn’t endangered. So the Southern Ocean ecosystem should be okay for now. Apart from all the climate change. Sorry.)