  The evolution of complex transport networks is investigated under three
strategies of link removal: random, intentional attack and "Pseudo-Darwinian"
strategy. At each evolution step and regarding the selected strategy, one
removes either a randomly chosen link, or the link carrying the strongest flux,
or the link with the weakest flux, respectively. We study how the network
structure and the total flux between randomly chosen source and drain nodes
evolve. We discover a universal power-law decrease of the total flux, followed
by an abrupt transport collapse. The time of collapse is shown to be determined
by the average number of links per node in the initial network, highlighting
the importance of this network property for ensuring safe and robust transport
against random failures, intentional attacks and maintenance cost
optimizations.
