Home Teachers | Mentors | Discussions | Research | Find
   Amphibian Biomonitoring Guided Research: Data Analysis     
the KanCRN Collaborative Research Network
Creating
 the Context

  Home
  Research Focus
  Background Info
  Research Methodology
  Data Submission
  Results of Study
  Data Analysis
  Conclusion
  Further Research


Guided
 Research

  Research Question
  Background Info
  Research Methodology
  Data Submission
  Results of Study
  Data Analysis
  Conclusion
  Further Research
  Research Values


Student
 Research

  Publish
  View

Sample Analysis

           Sample Data                                            ;      Analysis

Blanchards Cricket Frog - 15                       Mean = (15 + 5 + 8 + 3 + 6)/5 = 7.4

Gray Treefrog                -  5                         Species Richness = total number of                                      &n bsp;                                                            species found

American Toad              -  8                                         &n bsp;           = 5

Northern Spring Peeper -  3                          Species Diversity = 0.74

Southern Leopard Frog  -  6                                     (as shown below)

Calculating diversity using the Simpson Diversity Index

Calculate the proportion of the total number of amphibians of each species (Pi).

Proportion species A (Pa) = number of species A/Total number of amphibians
Proportion species B(Pb) = number of species B/Total number of amphibians

To calculate the Simpson Diversity Index = 1 - sum(Pi)2

         (meaning add the proportion of each squared species and take it from 1)

Using the example above, you have 15 cricket frogs, 5 gray treefrogs, 8 american toads, 3 spring peepers, and 6 leopard frogs. You would calculate:

Diversity Index = 1- ((15/37)2 + (5/37)2 + (8/37)2 + (3/37)2 + (6/37)2)
Diversity Index = .74

This index ranges from zero to one and is literally a measure of the probability that two amphibianss taken at random from the sample are different species. A number close to zero means low diversity and it is likely you will get the same species of amphibian and a number close to one means high diversity.

  1999, KanCRN Collaborative Research Network