Survival beyond survival of the fittest

See:

http://www.eurekalert.org/pub_releases/2011-03/uoe-rsn032311.php

Article reads: Dr Ivana Gudelj, also from the University of Exeter, said: “The fit use food well but they aren’t resilient to mutations, whereas the less efficient, unfit consumers are maintained by their resilience to mutation. If there’s a low mutation rate, survival of the fittest rules, but if not, lots of diversity can be maintained.

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