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| Pàgina inicial > Articles > Articles publicats > Whole genomes from the extinct Xerces Blue butterfly can help identify declining insect species |
| Data: | 2024 |
| Resum: | The Xerces Blue (Glaucopsyche xerces) is considered to be the first butterfly to become extinct in historical times. It was notable for its chalky lavender wings with conspicuous white spots on the ventral wings. The last individuals were collected in their restricted habitat, in the dunes near the Presidio military base in San Francisco, in 1941. We sequenced the genomes of four 80- to 100-year-old Xerces Blue, and seven historical and one modern specimens of its closest relative, the Silvery Blue (Glaucopsyche lygdamus). We compared these to a novel annotated genome of the Green-Underside Blue (Glaucopsyche alexis). Phylogenetic relationships inferred from complete mitochondrial genomes indicate that Xerces Blue was a distinct species that diverged from the Silvery Blue lineage at least 850,000 years ago. Using nuclear genomes, both species experienced population growth during the Eemian interglacial period, but the Xerces Blue decreased to a very low effective population size subsequently, a trend opposite to that observed in the Silvery Blue. Runs of homozygosity and deleterious load in the former were significantly greater than in the later, suggesting a higher incidence of inbreeding. These signals of population decline observed in Xerces Blue could be used to identify and monitor other insects threatened by human activities, whose extinction patterns are still not well known. |
| Ajuts: | Agencia Estatal de Investigación PID2021-124590NB-100 European Commission 864203 Agencia Estatal de Investigación BFU2017-86471-P Agencia Estatal de Investigación CEX2018-000792-M Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-880 Agencia Estatal de Investigación PID2019-107078GB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-991 |
| Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Publicat a: | eLife, Vol. 12 (October 2024) , art. RP87928, ISSN 2050-084X |
21 p, 1.2 MB |