Niche Overlap Calculator
Quantify the degree of niche overlap between two species using multiple ecological indices.
Species Resource Use
Comma-separated proportions for each resource category
Must have same number of categories as Species 1
Pianka's Index: O = Σ(p1·p2) / √(Σp1²·Σp2²)
Ranges from 0 (no overlap) to 1 (complete overlap)
Species 1 (normalized):
40.0%30.0%20.0%10.0%0.0%
Species 2 (normalized):
10.0%20.0%30.0%25.0%15.0%
Pianka's Overlap Index
0.712
60.0% resource overlap
Schoener's D
0.600
Morisita's C
0.705
Overlap Indices Comparison
Pianka's O0.712
Schoener's D0.600
Morisita's C0.705
Horn's Ro0.817
Resource-by-Resource Comparison
R1
R2
R3
R4
R5
Species 1 Species 2
Additional Metrics
Jaccard Similarity0.800
Niche Separation0.288
Competition Assessment: Moderate - some competition expected