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Fig. 4. Ecological niche comparison of Procambarus virginalis in three regions: Europe (EU); North America (NA); Northeast Asia (ASIA). (A) Niche overlap between EU, NA and ASIA. Red and green range indicate expansion and unfiling area, respectively. Purple range indicate overlapping niches, and red arrow represented shift of niche centroid. (B) The correlation circle shows the variable importance along the first two principle axes. (C) Niche equivalency and similarity tests each with 1,000 replications of EU-ASIA comparison. Red line indicated observed Schoener’s D.
J Ecol Environ 2024;48:- https://doi.org/10.5141/jee.24.087
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