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Environmental Stress and Biodiversity

Environmental Stress and Biodiversity. Diversity Indices. Diversity is composed of / richness eveness (# of taxa) (distrib. of indiv. among taxa) Note: richness alone often useful but problems:

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Environmental Stress and Biodiversity

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  1. Environmental Stress and Biodiversity

  2. 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

  3. Sequential Comparison Index • Developed for use in 3rd 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

  4. Diversity example Community 1 Community 2 (evenness high) (evenness low) Taxa ni pi pi2 ni pi pi2 A 10 0.1 0.01 91 0.91 0.8 B 10 0.1 0.01 1 0.1 .0001 C “ “ “ “ “ “ D “ “ “ “ “ “ E “ “ “ “ “ “ F “ “ “ “ “ “ G “ “ “ “ “ “ H “ “ “ “ “ “ I “ “ “ “ “ “ J “ “ “ “ “ “

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