Final SAC Parameter Dataset

Species accumulation curves (SACs) were created based on a combination of Ecoregion, Land Cover Class (LCC) and Watershed Position (WSP) within the Great Lake Basin Watershed (GLBW). This dataset contains parameters from the SACs fitted using the Lomolino function. The parameters included are slope, asymptote and xmid. Slopes of the Lomolino models represents the slope at the inflection point, or the point on the slope where the concavity of the curve changes (Lomolino, 2001). In terms of the Lomolino model, this inflection point also represents the maximum rate of increase in species richness (Lomolino, 2001). Fitted slope is therefore the parameter that allows for estimating the rate of species accrual at its greatest point. The asymptote represents the maximum richness of the sites sampled (Lomolino, 2001). The xmid is the number of points at which half the total species richness is achieved. 

Lomolino, M. V. (2001). The species-area relationship: new challenges for an old pattern. Prog. Phys. Geogr., 25, 1-21. https://doi/10.1177/030913330102500101