Akademik Veri Yönetim Sistemi
Eurbee 10th Apidology Congress, Tallinn, Estonya, 16 - 19 Eylül 2024, ss.99, (Özet Bildiri)
Bumblebees, ubiquitous, cold-adapted, and primitively eusocial insects, play crucial roles as pollinators in agricultural and natural ecosystems. Nonetheless, numerous bumblebee species are experiencing global declines, attributable to many factors, including anthropogenic habitat degradation, exposure to agricultural chemicals, and the effects of climate change. Notably, projections of future climate scenarios suggest an impending alteration in the spatial distribution patterns of bumblebee populations, wherein certain species may face declines while others could potentially expand their ranges. In this study, we present the comprehensive assembly and annotation of chromosome-scale genomes for two bumblebee species, Bombus lapidarius and Bombus niveatus, to elucidate species-specific genomic adaptations to environmental stressors. These genomes, encompassing over 23,000 protein-coding genes, exhibit sizes of 244.44 Mb (with a scaffold N50 of 9.45 Mb) for B. lapidarius and 259.84 Mb (with a scaffold N50 of 10.94 Mb) for B. niveatus, consistent with genomic characteristics observed in related bumblebee species. Comparative analysis of gene families reveals distinct expansions in each species: B. lapidarius demonstrates enrichment in genes associated with synaptic organization, while B. niveatus displays expansions in gene families implicated in cellular growth, aging, and responses to environmental stressors, notably featuring SCAN domains, WD-repeats, and Ras-related proteins. Furthermore, genome-wide screening identifies positive selection signals acting on genes involved in environmental stress response pathways, such as dip2, yme1l, and spg7 in B. lapidarius and myd88, mybbp1A, and rhau in B. niveatus. These findings underscore the adaptive evolutionary trajectories of bumblebees in response to changing environmental conditions, providing valuable insights into strategies for their conservation and management.