Implications of the last glacial maximum on the genetic diversity of six co-distributed taxa in the Baja California Peninsula

Aim: During the Last Glacial Maximum, the temperature in the Baja California Peninsula decreased and the precipitation increased compared to present climatic conditions. These changes influenced the geographic distribution and the demographic processes of plants and animals. This article aims to determine how Pleistocene and current climate impacted the geographic distribution and the genetic diversity patterns of six species co-distributed in the Baja California Peninsula.
Location: Northwest Mexico.
Taxon: A group of six species with desert affinities, two cacti ( Pachycereus pringlei and Stenocereus gummosus), one spider ( Pardosa sierra), one reptile ( Dipsosaurus dorsalis) and two birds ( Melanerpes uropygialis and Basilinna xantusii).
Methods: Meta-analysis of published microsatellite data was carried out for the previously mentioned species. Hierarchical Generalized Additive Models (HGAMs) were used to assess the relationship between genetic diversity values and six abiotic predi..., Gam_data: Expected heterozygosity corrected for the number of samples (He) was determined in GenAlEx version 6.5 (Peakall & Smouse, 2006). Allelic richness (Ar) was calculated in the R package hierfstat (Goudet, 2005) and the rarefaction method was applied to avoid biases due to differences in the number of samples (the sample size was adjusted to two in all species). Latitude and longitude were retrieved from the coordinates of each locality. Elevation data were obtained from the NASADEM Digital Elevation Model (NASA JPL, 2020). Current climate data (B1, B5, and B12) were obtained from the 19 climate layers of WorldClimm 2.1 (Fick & Hijmans, 2017) while for climate change data (the absolute difference between current and Last Glacial Maximum climatic variables; B1_c, B5_c, B6_c, and B12_c) the Last Glacial Maximum climate data was obtained by averaging the raster of the three global circulation models available in WorldClimm 1.4 (Hijmans et al., 2005), the Community Climate Sys..., , # Implications of the last glacial maximum on the genetic diversity of six co-distributed taxa in the Baja California Peninsula

[https://doi.org/10.5061/dryad.crjdfn3f7](https://doi.org/10.5061/dryad.crjdfn3f7)

## Description of the data and file structure

GAM_data: contains the data used for the generalized additive model, which was used to find the relationship between two metrics of genetic diversity (expected heterozygosity and allelic richness) and several abiotic predictors.

Bx_OccurrenceData: contains the coordinates of the Basilinna xantusii occurrence points used for the potential distribution model.

Dd_OccurrenceData: contains the coordinates of the Dipsosaurus dorsalis occurrence points used for the potential distribution model.

Mu_OccurrenceData: contains the coordinates of the Melanerpes uropygialis occurrence points used for the potential distribution model.

Pp_OccurrenceData: contains the coordinates of the Pachycereus pringlei occurrence points used for the potent...