Fungal arbitrage.

“The fungus actively transported phosphorus-using its dynamic microtubule

"motors"-from areas of abundance, where it fetched a low price when exchanged with a plant root, to areas of scar-city, where it was in higher demand and fetched a higher price. By doing so, the fungus was able to transfer a greater proportion of its phosphorus to the plant at the more favorable exchange rate, thus receiving larger quantities of carbon in return.”