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Radiation of the D rosophila nannoptera species group in M exico

2014; Oxford University Press; Volume: 27; Issue: 3 Linguagem: Inglês

10.1111/jeb.12325

1420-9101

Michael Lang, Maxi Polihronakis Richmond, Andrea Acurio, Therese A. Markow, Virginie Courtier‐Orgogozo,

Insect-Plant Interactions and Control

Abstract The D rosophila nannoptera species group, a taxon of M exican cactophilic flies, is an excellent model system to study the influence of abiotic and biotic factors on speciation, the genetic causes of ecological specialization and the evolution of unusual reproductive characters. However, the phylogenetic relationships in the nannoptera species group and its position within the virilis‐repleta phylogeny have not been thoroughly investigated. Using a multilocus data set of gene coding regions of eight nuclear and three mitochondrial genes, we found that the four described nannoptera group species diverged rapidly, with very short internodes between divergence events. Phylogenetic analysis of repleta group lineages revealed that D . inca and D . canalinea are sister to all other repleta group species, whereas the annulimana species D . aracataca and D . pseudotalamancana are sister to the nannoptera and bromeliae species groups. Our divergence time estimates suggest that the nannoptera species group radiated following important geological events in Central A merica. Our results indicate that a single evolutionary transition to asymmetric genitalia and to unusual sperm storage may have occurred during evolution of the nannoptera group.