Stonefly species richness vs. HUC8 surface area (km2). Simple linear regression equation, R2, and line-of-best-fit provided. Lower Scioto watershed point indicated.

 
  Part of: DeWalt R, Grubbs S, Armitage B, Baumann R, Clark S, Bolton M (2016) Atlas of Ohio Aquatic Insects: Volume II, Plecoptera. Biodiversity Data Journal 4: e10723. https://doi.org/10.3897/BDJ.4.e10723