Is ecological status an indicator of biodiversity?

Ecological status is not the same as biodiversity. They tested the hypothesis that where there is good ecological status there should be many rare species. In 175 out of 187they did not find rare species Only 6% of sites with high ecological status (DVPI) had rare species and 21% with DVFI A lot of species could be lost without loosing ecological status. Species can still be lost in places with high ecological satus.