Potential biodiversity map of lizard species in Southern Patagonia: environmental characterization, desertification influence and analyses of protection areas

in Amphibia-Reptilia
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The distribution of biodiversity at the landscape level is shaped by biotic, abiotic and anthropogenic factors. Biodiversity maps provide the basis for defining management and conservation strategies that can minimize human impacts. The objective was to elaborate a map of potential biodiversity of lizards based on habitat suitability maps of individual species in Santa Cruz (Argentina). Also, we analysed desertification influence and the representativeness of the current network of protected areas on the lizard biodiversity. For this, we used a database of eight lizard species and we explored 41 potential explanatory variables to develop habitat suitability maps, which were combined to obtain one single map of the potential biodiversity. We analysed the outputs in a GIS project using the marginality and the specialization indexes and the normalized difference vegetation index of each species. Also, we characterized the potential biodiversity using the following variables: desertification, ecological areas and current network of protected areas. We detected differences in the occupied niches for the different species throughout the landscape. The map of potential biodiversity uncovered hotspots of biodiversity in the north-east study area, where the prevalence of unique climatic conditions showed a dry steppe and a high degree of desertification due to the human impacts (e.g. livestock). These results can be readily used as a support system for conservation and management strategies at different scale levels in areas with higher human impacts or to develop new protection areas.

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Potential biodiversity map of lizard species in Southern Patagonia: environmental characterization, desertification influence and analyses of protection areas

in Amphibia-Reptilia



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    Characterization of the study area: (A) location of Argentina (dark grey) and Santa Cruz province (black); (B) towns (big dot = capital city, middle dots = towns >3000, small dots = towns <3000 inhabitants), lakes and main rivers; (C) relief (grey = <400, dark grey = 400-1000, black = >1000 m.a.s.l.); (D) main ecological areas (light grey = dry steppe, grey = humid steppe, medium grey = shrub-lands, dark grey = sub-Andean grasslands, black = forests and alpine vegetation) (modified from Oliva, Gonzalez and Ruial, 2004), and (E) protection areas (grey = provincial reserves, black = national parks).

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    Specialization (low species’ variance compared to global variance of the data base) vs. marginality (large difference of species’ mean compared to the mean of the data base) of the studied species, which were grouped according to predominant geographic distribution (North, General, South) inside the study area (see supplementary material). Species code means: LIBI = Liolaemus bibronii, LIFI = L. fitzingerii, LIKI = L. kingii, LILI = L. lioneomaculatus, LISA = L. sarmientoi, LIES = L. escarchadosi, DIBI = Diplolaemus bibronii, and HODA = Homonota darwinii darwinii.

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    Variation of potential habitat suitability (PHS) of lizard species according to the normalized difference vegetation index (NDVI) and their predominant geographic location (North = black, General = grey, South = pale grey). Species code means: LIBI = Liolaemus bibronii, LIFI = L. fitzingerii, LIKI = L. kingii, LILI = L. lioneomaculatus, LISA = L. sarmientoi, LIES = L. escarchadosi, DIBI = Diplolaemus bibronii, and HODA = Homonota darwinii darwinii.

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    Map of potential biodiversity (MPB) of lizard species in Santa Cruz province. Low potential = pale grey (1-21%), medium potential = grey (22-37%), high potential = black (38-100%).

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    Characterization (mean and standard deviation) of the climatic and topographic variables analysing the map of potential biodiversity (MPB) of lizard species classified according to their values: total means the entire province, low (1-21%), medium (22-37%) and high (38-100%) potential quality classified according to the modelling.

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    Percentage occupied by the qualities according to the map of potential biodiversity (MPB) of lizard species classified by the occurrence in different categories of ecological areas (see fig. 1D) and intensities of desertification (see Del Valle et al., 1998). Where low (1-21%), medium (22-37%) and high (38-100%) potential quality were classified according to the modelling.

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    Percentage and area (km2) occupied by the qualities according to the map of potential biodiversity (MPB) of lizard species classified by the occurrence and their protection status: provincial reserves (PR), national parks (NP) (see fig. 1E). Where low (1-21%), medium (22-37%) and high (38-100%) potential quality were classified according to the modelling.


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