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where Pi is the proportional abundance of the ith species and a and α determines the relative weighting towards species richness or dominance. The approach involves calculating Ha α for a range of a values and then plotting Ha α against a α. If the trajectories for communities cross they are not comparable, but if one consistently falls below another (as demonstrated in Figure 5.2, which compares the diversity of fish communities in the North Sea) the community with the lower curve is considered to be less diverse (Jennings et al. 2001).
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Should be suitable for all ecosystems, though these indices have only been tested for benthic communities in the North Sea and fish communities in the north-east Atlantic (Rogers et al. 1999 in Jennings et al. 2001).
Identified capability
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Biological classification level
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Response variable
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Drivers
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Robustness
The following is from Fulton et al 2004a -
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