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Horses for courses, they never were in favour with me because diversity is not very important in my habitat assesment work. Site A with 100 common, widespread species is more diverse than site B with 50 species but if 20 of these 50 are rare and endangered then site B is the one which needs to be identified as of conservation concern. Indeed low diversity sites are often the best places for scarce species, early pioneer communities being a prime example.

So its all about what you are trying to find out about the site.