pone.0222532.g004.tif (163.64 kB)

Ternary soil map showing percent composition of clay, sand, and silt at spadefoot sites.

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posted on 03.10.2019 by Katherine L. Baumberger, M. V. Eitzel, Matthew E. Kirby, Michael H. Horn

On each side the arrow indicates which direction to read for that soil type (e.g. "clay" percentages are read horizontally). Black "X"s indicate the soil texture of pseudoabsence sites and black "O"s indicate soil texture of aestivation sites for our 15 spadefoots. The thick gray lines indicate principal component combinations of soil textures: principal component 1 (longer line) reflects the greatest variation in soil composition in our sites (which spadefoots did not respond to in choosing aestivation sites), and principal component 2 (shorter line) reflects the deviation from the first component (which spadefoots did respond to in choosing aestivation sites). In particular, spadefoots tend to avoid clay soils. In color are model predictions using those two principal components: red signifies 99.7% probability of finding a spadefoot, while light yellow indicates 79.6% probability of finding a spadefoot.