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Distribution area of Lithobates catesbeianus in San Carlos, Maldonado Department (Uruguay). Estimated bullfrog density levels are shown: 0 in white, 1 in yellow, 2 in orange, 3 in dark red. Location of the old farms facilities (sky-blue stars): 1, registered farm (Laufer et al., 2018a), 2, unregistered farm. Circles: sample ponds, shaded areas encompass polygons of invaded ponds and a 727 m buffer area.
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