1. Environmental Stress and Biodiversity

5. Diversity Indices Diversity is composed of / \ richness eveness (# of taxa) (distrib. of indiv. among taxa) Note: richness alone often useful but problems: - does not take # of individuals into account - very dependent on sample size unless large

8. Sequential Comparison Index Developed for use in 3 rd world countries Main advantage – no taxonomic expertise required Measures probability of next sampled organism being the same as the last one Will go over how to calculate in lab

10. Diversity example Community 1Community 2 (evenness high)(evenness low) Taxa ni pi pi2 ni pi pi2 A100.10.01910.910.8 B100.10.0110.1.0001 C “ “ “““ “ D “ “ “““ “ E “ “ “““ “ F “ “ “““ “ G “ “ “““ “ H “ “ “““ “ I “ “ “““ “ J“ “ “““ “