Environmental Stress and Biodiversity

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Environmental Stress and Biodiversity
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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

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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

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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