Figure 4.

Example of biodiversity (modified Kempton index, Q-90) tracked over 50 year optimal harvest scenarios in a northern British Columbia marine ecosystem restored to a candidate ‘Lost Valley’ and then fished (from year 0) with a designed responsible fishing fleet. This ‘Lost Valley’ example is the ecosystem in its estimated state in 1750 before contact of native peoples with Europeans. Objective functions have been maximized by searches. Open circles represent the results for an economic objective; the solid line represents the results for a mixed ecological/economic objective. Note that fishing under the purely economic objective progressively depletes biodiversity. (Modified from Ainsworth & Pitcher 2005b.)