Evidence for Introgression Among Three Species of the Anastrepha fraterculus Group, a Radiating Species Complex of Fruit Flies
Lima, Andre Luis A.
Nakamura, Aline M.
Sobrinho, Iderval, Jr.
de Brito, Reinaldo A.
AffiliationUniv Arizona, Dept Entomol
KeywordsAnastrepha fraterculus group
incomplete lineage sorting
isolation with migration
approximate Bayesian computation
MetadataShow full item record
PublisherFRONTIERS MEDIA SA
CitationDíaz F, Lima ALA, Nakamura AM, Fernandes F, Sobrinho I Jr and de Brito RA (2018) Evidence for Introgression Among Three Species of the Anastrepha fraterculus Group, a Radiating Species Complex of Fruit Flies. Front. Genet. 9:359. doi: 10.3389/fgene.2018.00359
JournalFRONTIERS IN GENETICS
Rights© 2018 Díaz, Lima, Nakamura, Fernandes, Sobrinho and de Brito. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractIntrogression should no longer be considered as rare a phenomenon as once thought, since several studies have recently documented gene flow between closely related and radiating species. Here, we investigated evolutionary relationships among three closely related species of fruit flies of the Anastrepha fraterculus group (Anastrepha fraterculus, A. obliqua and A. sororcula). We sequenced a set of 20 genes and implemented a combined populational and phylogenetic inference with a model selection approach by an ABC framework in order to elucidate the demographic history of these species. The phylogenetic histories inferred from most genes showed a great deal of discordance and substantial shared polymorphic variation. The analysis of several population and speciation models reveal that this shared variation is better explained by introgression rather than convergence by parallel mutation or incomplete lineage sorting. Our results consistently showed these species evolving under an isolation with migration model experiencing a continuous and asymmetrical pattern of gene flow involving all species pairs, even though still showed a more closely related relationship between A. fraterculus and A. sororcula when compared with A. obliqua. This suggests that these species have been exchanging genes since they split from their common ancestor similar to 2.6 MYA ago. We also found strong evidence for recent population expansion that appears to be consequence of anthropic activities affecting host crops of fruit flies. These findings point that the introgression here found may have been driven by genetic drift and not necessary by selection, which has implications for tracking and managing fruit flies.
NoteOpen access journal.
VersionFinal published version
SponsorsFAPESP (Fundacao do Amparo a Pesquisa do Estado de Sao Paulo) [2010/20455-4]; Science without Borders program at CAPES [PVE 056/2013]; CAPES SWB