**3. Results**

Of a total of 749 endemic species of amphibians and reptiles, we produced robust potential species distributions for 62 species of amphibians and 117 species of reptiles. There were a total of 10,079 records, ranging from 10 as in *Sceloporus zosteromus*, *Phyllodactylus unctus*, *Lithobates sierramadrensis*, *Craugastor pozo*, and *Incilius cavifrons*, to 514 as in *Sceloporus torquatus*.

## *3.1. Extant Species Distributions*

A total of 49 species showed a reduction of less than 30% of their potential distribution due to habitat loss. The remaining 130 species lost more than 30% of habitat, as follows: A total of 79 species lost between 30–50% of their distribution, 49 species lost between 50–80%, and 2 species lost more than 80% (Figure 1; Figure 2; Supplementary Material: Table S1). There was no significant di fference in the impact of habitat loss on species of amphibians and reptiles (*F* = 0.203, *df* = 1, *p* = 0.65).

The combined impact of habitat loss and mining activities in extant species distribution was significantly higher (extant species distribution due to habitat loss: 40.56 ± 16.15; extant species distribution due to habitat loss and mining: 42.16 ± 15.67; *t* = −20.10, *df* = 178, *p* < 0.001), but it did not di ffer between species of amphibians and reptiles (*F* = 0.341, *df* = 1, *p* = 0.56). Of the 179 endemic species of amphibians and reptiles, only 40 species lost less than 30% of their distribution, while 83 species lost between 30–50%, 54 species lost between 50–80%, and two species lost more than 80% of their distribution (Figure 1; Table S1). The contribution of mining activities increased the percentage of distribution loss of all species, and resulted in nine species increasing from a loss <30% to a loss between 30–50%, and five species increased from a loss between 30–50% to a loss between 50–80% of their distribution (Figure 1; Table S1).

**Figure 1.** Number of Mexican endemic species of amphibians and reptiles in each group of percentage of distribution lost under each scenario.

**Figure 2.** Distribution of *Anaxyrus compactilis* under three scenarios: (**a**) Potential species distribution; (**b**) extant species distribution due to habitat loss; and (**c**) extant species distribution due to habitat loss and mining activities.

## *3.2. Conservation Area Network under Three Scenarios*

Under the scenario of potential species distribution, the conservation area network representing 20% of species distributions, resulted in a total of 237,195 km<sup>2</sup> contained in 2624 clusters, with a perimeter of 222,715.21 km, and a shape of 0.50 (perimeter/area). Under the scenario of extant species distribution due to habitat loss in a total of 250,563 km<sup>2</sup> contained in 8010 clusters, a perimeter of 222,715.21 km and a shape of 0.88 resulted. Under the scenario of extant species distribution due to habitat loss and mining activities in a total of 251,678.80 km2, a perimeter of 237,148.20 km, 8706 clusters and a shape of 0.94 resulted (Figure 3).

**Figure 3.** Area and configuration of the conservation area network (area, perimeter, shape, and number of clusters or fragments) including 20% of the 179 species potential distribution, species extant distribution due to habitat loss, and species extant distributions due to habitat loss and mining activities, respectively.
