Ecological niche overlap between Pseudoanthidium jacobii and P. canariense in the Canary Islands represented by a principal component analysis (PCA). Light grey diamonds represent occurrence records of P. jacobii, and the small underlying dark grey area represents its niche space. Black triangles represent occurrence records of P. canariense and the light grey underlying area represents its niche space. The small black area represents shared niche space between the two species. Small grey dots are background environmental samples from the Canary Islands. Schoener’s D statistics and the p-value from the niche equivalence test are also shown. See methods and results sections for more details.