Measurements of biodiversity

When considering the biodiversity of an aquatic system after a human caused disaster (chemical spill) what would be a adequate measure of biodiversity. In the past I have used Margelef’s index to study species richness Dmg = (S-1)/ln N. This however does not take into account influences or stresses placed upon the population / ecosystem or the reducing of the population due to death. Is there such a measurement that can predict future loss or is a before and after study design needed to test impacts. Help would be much appreciated, thankyou.


New Member
I'm a marine biology honours student and not a statistian. So coming from the scientist point of view I would design an experiment which would assess the before and after conditions to determine whether an ecological disaster has occurred as there may be other factors which may change the outcome. I hope this helps a bit.