== 3.15 Compensatory natural mortality ==

Compensatory changes in natural mortality rate (''M'') can be simulated by combining two effects: nonzero ‘Feeding time adjustment rate’ (set on the [wiki:GroupInfo Group info] form), and either high ''EE'' from Ecopath or high proportion of Mo due to predation (unexplained predation > 0).  With these settings, especially when [wiki:VulnerabilitiesFlowControl Vulnerabilities] of prey to a group are low, decreases in biomass lead to reduced feeding time, which leads to proportional reduction in natural mortality rate.