Fig 1.
Geographic distribution of Gopherus flavomarginatus.
The thick black line delineates the polygon of the Mapimí Biosphere Reserve, whereas the state borders are mark by the thin black lines. Red dots pinpoint the sites where the abundance data for the Bolson tortoises was recorded. The star indicates the location of the Mapimí field station.
Table 1.
Climate and topographic variables used for inferring the ecological niche and abundance models of the Bolson tortoise.
Fig 2.
Maps showing the potential distribution and abundance of Gopherus flavomarginatus.
(A) Inferred abundance for the Bolson tortoise (burrows/Km2); red dots pinpoint the sites where the abundance data for the Bolson tortoises was recorded. (B) Standard deviation of abundance.
Table 2.
Goodness-of-fit of the regression models between Mahalanobis distance to the ENC and burrow abundance of Gopherus flavomarginatus.
Fig 3.
Relationship between the observed abundance (burrows/Km2) of Gopherus flavomarginatus and the distance to the species´ ecological niche centroid.
Table 3.
Validation for the Inverse Regression Model between Mahalanobis distance to the ENC and burrow abundance.
Table 4.
Recorded abundance of Gopherus flavomarginatus expressed as the number of burrows/Km2.
Fig 4.
Proposed key sites (yellow polygons) for the conservation of the Bolson tortoise, Gopherus flavomarginatus.
The red line delineates the current protected polygon of the Mapimí Biosphere Reserve. Sierra del Diablo (A) and Sierra Mojada (B) represent putative high abundance sites; nonetheless, these are low priority areas due to their natural isolation and low human population density.