Assessing differences in food web metrics in freshwater ecosystems after the invasion of Northern crayfish (Faxonius virilis)

Figure 2.

Corrected isotopic carbon (δ¹³Ccorr) and trophic position (TP) biplots showing each species’ core basin-wide isotopic niche width. Isotopic niche widths are expressed in ‰² and were calculated using small sample size corrected standard ellipse area (SEAc) which contains 1 SD around the mean or approximately 40% of the data for each species. Isotopic niches are labeled with the corresponding species’ shorthand name, ellipse color, and marker type. Black open circles = F. virilis; red crossed circles = L. lota; orange open diamonds = C. plumbeus; blue open triangles = R. cataractae; green open squares = Catostomus spp.; and gold hourglasses = P. omiscomaycus. Plotting of core isotopic niches were done using the SIBER R package.

	Figure 2. Corrected isotopic carbon (δ¹³Ccorr) and trophic position (TP) biplots showing each species’ core basin-wide isotopic niche width. Isotopic niche widths are expressed in ‰² and were calculated using small sample size corrected standard ellipse area (SEAc) which contains 1 SD around the mean or approximately 40% of the data for each species. Isotopic niches are labeled with the corresponding species’ shorthand name, ellipse color, and marker type. Black open circles = F. virilis; red crossed circles = L. lota; orange open diamonds = C. plumbeus; blue open triangles = R. cataractae; green open squares = Catostomus spp.; and gold hourglasses = P. omiscomaycus. Plotting of core isotopic niches were done using the SIBER R package.
	Part of: Van Mierlo VA, Green SJ, Emmerton CA, Nasr M, Stuparyk BR, Vinebrooke RD, Buendia C, Wyatt FR, Poesch MS (2026) Assessing differences in food web metrics in freshwater ecosystems after the invasion of Northern crayfish (Faxonius virilis). Aquatic Invasions 21(1): 13-34. https://doi.org/10.3391/ai.2026.21.1.183198