Biology subjects

Jaramillo-Correa, J. P.

Publications and source records attributed to Jaramillo-Correa, J. P..

2 recordsLinked to original sources

bioRxiv2025

Concordant yet unique neutral and adaptive genomic responses to anthropogenically modified landscapes in Rhinella horribilis

Anthropized environments are significantly challenging for wild species. Rapid adaptation to such habitats is thus key for their long-term persistence. Deciphering the environmental factors associated with species tolerance to modified habitats is fundamental for understanding the genetic and connectivity patterns of individuals and the local adaptation of their populations. We studied the Giant Toad, Rhinella horribilis, from two landscapes with distinct levels of anthropogenic habitat modification, assessed their genomic diversity, structure and connectivity with ddRAD-seq genomic data, identified potential outlier loci and their relationship with environmental and physicochemical water variables, and evaluated if populations from the two study sites showed signals of parallel adaptation. Both concordant and unique patterns were found regarding landscape factors and genotype-environment associations related with the degree of anthropic modification between landscapes. Genomic structure and connectivity were significantly associated with the presence of temporary water bodies, low vegetation cover, high humidity, solar radiation, and temperature. Notably, we identified both shared and distinct outlier SNPs and annotated functional genes for the two landscapes. Genes were enriched for biological processes and metabolic pathways, which were in turn correlated with environmental and physicochemical water variables. Genes and metabolic pathways were associated mainly with embryonic development, sexual maturation and immune responses. Studies such as this one, in an often-disregarded species, illustrate how parallel and un-parallel adaptive landscape genomic patterns arise in the stressful conditions of anthropized habitats.

evolutionary biology↗

bioRxiv2020

Polygenic adaptation and negative selection across traits, years and environments in a long-lived plant species (Pinus pinaster Ait.)

A decade of association studies in multiple organisms suggests that most complex traits are polygenic; that is, they have a genetic architecture determined by numerous loci distributed across the genome, each with small effect-size. Thus, determining the degree of polygenicity and its variation across traits, environments and years is useful to understand the genetic basis of phenotypic variation. In this study, we applied multilocus approaches to estimate the degree of polygenicity of fitness-related traits in a long-lived plant (Pinus pinaster Ait., maritime pine) and to analyze how polygenicity changes across environments and years. To do so, we evaluated five categories of fitness-related traits (survival, height, phenology-related, functional, and biotic-stress response traits) in a clonal common garden network, planted in contrasted environments (over 12,500 trees). First, most of the analyzed traits showed evidence of local adaptation based on QST-FST comparisons. Second, we observed a remarkably stable degree of polygenicity, averaging 6% (range of 0-27%), across traits, environments and years. As previously suggested for humans, some of these traits showed also evidence of negative selection, which could explain, at least partially, the high degree of polygenicity. The observed genetic architecture of fitness-related traits in maritime pine supports the polygenic adaptation model. Because polygenic adaptation can occur rapidly, our study suggests that current predictions on the capacity of natural forest tree populations to adapt to new environments should be revised, which is of special relevance in the current context of climate change.

genetics↗