How to use Shannon Biodiversity Index to Compared Biodiversity
A mathematical formula that measures the diversity of species in a community.
It measures the diversity of a community by considering both the species richness and evenness.
With this equation, you’ll be solving for E!
When E = 1, the species in a population are equally represented which means the population has biodiversity.
Pi - represents the number of a certain species divided by the total population.
The 'i' in Pi for this equation represents the species you are calculating Pi for.
S - represents the number of species in a population.
E - represents the evenness of species in a population.
The fact that different species are represented evenly is an important factor of biodiversity.
H - represents the Shannon Biodiversity Index number.
Higher values of H represent greater biodiversity.
Calculate Pi for each species
So if we had 18 snakes out of 110 total animals, it will be 18/110.
This would give us the answer .16
Every value of Pi added together should equal 1 or be close to it.
Calculate the natural log (ln) of Pi for each value
Equation: In(Pi)
With the snakes, the equation will be In(.16)
The answer -1.83 is our ln.
Multiply each Pi to each natural log
For the snakes, the equation will be 0.16 * 1.83
The answer will be -0.29
Add the Pi x ln values for each species
Multiply the previous value by -1 to get the value of H
Plug in the value of H into the equation.
You’re able to use the E value to compare the evenness of different populations.
The higher the E value, the more even the population.
You’re also able to utilize the H value for comparisons.
The higher the H value, the greater diversity there is in a population.
A mathematical formula that measures the diversity of species in a community.
It measures the diversity of a community by considering both the species richness and evenness.
With this equation, you’ll be solving for E!
When E = 1, the species in a population are equally represented which means the population has biodiversity.
Pi - represents the number of a certain species divided by the total population.
The 'i' in Pi for this equation represents the species you are calculating Pi for.
S - represents the number of species in a population.
E - represents the evenness of species in a population.
The fact that different species are represented evenly is an important factor of biodiversity.
H - represents the Shannon Biodiversity Index number.
Higher values of H represent greater biodiversity.
Calculate Pi for each species
So if we had 18 snakes out of 110 total animals, it will be 18/110.
This would give us the answer .16
Every value of Pi added together should equal 1 or be close to it.
Calculate the natural log (ln) of Pi for each value
Equation: In(Pi)
With the snakes, the equation will be In(.16)
The answer -1.83 is our ln.
Multiply each Pi to each natural log
For the snakes, the equation will be 0.16 * 1.83
The answer will be -0.29
Add the Pi x ln values for each species
Multiply the previous value by -1 to get the value of H
Plug in the value of H into the equation.
You’re able to use the E value to compare the evenness of different populations.
The higher the E value, the more even the population.
You’re also able to utilize the H value for comparisons.
The higher the H value, the greater diversity there is in a population.