spider genus Disdera The Canary Islands have experienced remarkable diversification, with around 60 endemic species emerging in the 20 million years since their origin. This evolutionary radiation is accompanied by substantial dietary changes and is often characterized by phenotypic changes, including morphological, metabolic, and behavioral changes. These endemic spiders therefore represent excellent models for understanding evolutionary drivers and pinpointing the genomic determinants underlying adaptive radiation. We recently succeeded in constructing the chromosome-level genome for one of our endemic species for the first time. D. Silvaticaproviding high-quality reference sequences for evolutionary genomics research. Here, we conducted a low-coverage-based resequencing study of natural populations. D. Silvatica Originally from La Gomera. Utilizing new high-quality genomes, we characterized nucleotide polymorphisms, divergence and linkage disequilibrium at the genome-wide level and inferred the demographic history of this population. We also performed a comprehensive genome-wide scan for recent positive selections. Our findings reveal very high levels of nucleotide diversity and recombination in this geographically restricted endemic species, indicating a historically large effective population size. Masu. We also identified several candidate genomic regions that could potentially be undergoing positive selection and focused on related biological processes such as vision and nitrogen extraction as potential adaptive targets. These processes may ultimately promote species diversification in this genus. This pioneering study of spiders, endemic to oceanic islands, lays the foundation for broader population genomic analyzes aimed at understanding the genetic mechanisms driving adaptive radiation in island ecosystems. be.
Escuer, P., Guirao-Rico, S., Arnedo, MA, Sánchez-Gracia, A., and Rozas, J. Population genomics of adaptive radiation: exceptionally high levels of genetic diversity in endemic spiders of the Canary Islands. sex and recombination. molecular ecologye17547. https://doi.org/10.1111/mec.17547
