The Interplay between Structure and Function in Fungal Networks

Abstract

Saprotrophic woodland fungi form self-organised transport networks as they forage for resources across the forest floor. These networks adapt during development by selective reinforcement of major transport routes and recycling of the intervening redundant mycelium to support further extension. The predicted transport performance of the resulting weighted networks show improved efficiency in comparison to evenly weighted networks with the same topology, or standard reference networks. Experimental measurement of nutrient movement using radiotracers and scintillation imaging show that fluxes are more dynamic, with synchronised oscillations and switching between different pre-existing routes. The same structures that confer good transport efficiency also show good resilience to both simulated damage and experimental attack by grazing insects, with persistence of a centrally connected core. We argue that fungi grow as self-organised planar spatial networks, honed by evolution, which may exemplify potential solutions to real-world compromises between search strategy, transport efficiency, resilience and cost.