Exact(4)
Climatic layers were obtained for pre-industrial (representing current climate conditions), mid-Holocene (6 ka) and Last Glacial Maximum (LGM; 21 ka) to characterize climate oscillations, hence the palaeodistribution dynamics through the last glacial cycle.
The same set of climatic layers used for developing the potential distribution coverage are standardized to have an average of zero and a standard deviation of 1 in order to perform a principal components analysis.
The resolution of climatic layers used for the SDMs was estimated by dividing the distribution area size with the previously calculated number of grid cells.
Focussing on individual species, we can see a detailed breakdown of the individual climatic layers for each species in table 1 and figure 6.
Similar(56)
We used the WorldClim [ 109] global climate layers considering all 19 Bioclim variables as an approximation of the climatic niche of the species.
The model was then applied to the Model for Interdisciplinary Research on Climate (MIROC) layers to estimate suitable climatic conditions for C. cardinalis during the Last Glacial Maximum.
Climatic data (19 layers) were obtained from the Worldclim bioclimatic database (Hijmans et al. 2005), and Maxent was set to use 30% of values for training.
To investigate potential environmental correlates of geographic variation in colour morph frequencies, we acquired 0.01 degree (approximately 1 km) resolution climatic and topographic layers from the Atlas of Living Australia (ALA; http://www.ala.org.au; [ 33]).
Given the resolution of the climatic and topographic layers used, the values obtained were the same for most lizards within a site (lizards within 1 km of each other); however, the area covered within sites ranged between 0.2 2 km.
For this purpose, all needed raster layers, including climatic (precipitation, temperature), topographic (aspects and slope) and soil-related (texture, pH, EC) layers, were provided by interpolation, surface analysis and other related techniques in GIS.
In lower layers micro-climatic conditions as well as abiotic soil parameters were shown to be of special importance.
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