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Dataset Totals

Total Number of Organisms:
315
Total Number of Species:
12
Average population size:
26.25
Decimal Accuracy:
7
Total Number of Regions:
1
Total Number of Region Sets:
1

Alpha Biodiversity [α]

Simpson Index(∑(ni(ni-1)/(N(N-1))))
0.09552118
Simpson Index Approximation(∑((n/N))2)
0.09839254
Dominance Index(D = 1 - Simpson)
0.9044788
Dominance Index Approximation(D = 1 - Simpson)
0.9016075
Reciprocal Simpson Index(1 / Simpson)
10.46888
Alternate Reciprocal Simpson Index(1 / Simpson)
10.16337
Shannon Indexlog
3.459065
Berger-Parker Dominance IndexS/N^.5
0.1492063
Shannon Indexln
2.397641
Inverted Berger-Parker Dominance IndexS/N^.5
6.702128
Shannon Index%
-1.041282
Margalef Richness IndexS/N^.5
1.912188
Menhinick IndexS/N^.5
0.6761234
Rényi Entropy/Hill Numbers (r=0,1,2,∞)e^H/S
12, 10.99807, 10.16337,
Buzas and Gibson's Indexe^H/S
0.9164338
Gini Coeffificient(2*sum(i*ni)/n*sum(ni))-(N+1)/N
0.234127
Equitability IndexS/N^.5
0.9648818
ln() of Hill Numbers (0,1,2,∞):
2.484907, 2.397719, 2.31879, -

Beta Biodiversity [β]

Comparing two sample areas

Absolute beta Value ((S0-c)-(S1-c)...):
11
Whittaker's Index (S/alpha):
1
Sørensen's similarity index:
1
Alternate Whittaker's Index (S/alpha-1):
0
Sørensen's similarity index (%):
100%
Jaccard Index:
-1
Routledge beta-R Index:
4
Jaccard Index (%):
-100%
Mountford Index:
-0.2
Number of Common Species:
12
Mountford Index (%):
-20%
Bray Curtis dissimilarity
0

Gamma Biodiversity [γ]

Comparing many sample areas

Absolute gamma (S0+S1...-c):
0
By the definitions used in this calculator, Alpha indices are for a single sample of a single region. This is the most typical way to study and measure biodiversity. These indices are calculated with all data provided to the calculator as a single sample, if you are unsure which indices to use, start with Alpha values. Beta diversity indices compare two sample regions for "similarity" and other correlations of biodiversity between two different areas/regions. For example, studies of mammal populations in 2.5 x 105 hectares of the Rocky Mountains compared to mammal populations in 2.5 x 105 hectares of the Alps. This is less common and requires careful, consistent data collection to be useful. Gamma diversity indices calculator for large or global areas, where many samples are being compared, and are the rarest to use in published studies and articles.


Static Charts



All Populations


Common Species


Simpson Index


Preston diagram


Renyi/Hill graph


Renyi/Hill graph (ln)


Lorenz graph


Rarefaction Curve

Dynamic Charts


Interactive Data