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Just a note

In other words, if your survey recorded n organisms, of which i belonged to the most abundant species, then d = i / n
  • If d is close to one, then other species are either rare or non-existent, and that community lacks heterogeneity.
  • Conversely, in a sample comprising s species, the minimum value of d is 1/s - so if d approaches zero there are many species, all of which are similarly abundant.

Notice however, if we use d to compare communities, and in each community the same proportion of individuals represents its most abundant species, it does not matter how many less common species were found in each community - their d is identical, irrespective of s.