Several true fruit flies (Tephritidae) cause major damage to agriculture worldwide. Among them, species of the genus Bactrocera are extensively studied to understand the traits associated with their invasiveness and ecology. Comparative approaches based on a reliable phylogenetic framework are particularly effective, but several nodes of the Bactrocera phylogeny are still controversial, especially concerning the reciprocal affinities of the two major pests B. dorsalis and B. tryoni. Here, we analyzed a newly assembled genomic-scaled dataset using different models of evolution to infer a phylogenomic backbone of ten representative Bactrocera species and two outgroups. We further provide the first genome-scaled inference of their divergence by calibrating the clock using fossil records and the spontaneous mutation rate. The results reveal a closer relationship of B. dorsalis with B. latifrons than to B. tryoni, contrary to what was previously supported by mitochondrial-based phylogenies. By employing coalescent-aware and heterogeneous evolutionary models, we show that this incongruence likely derives from a hitherto undetected systematic error, exacerbated by incomplete lineage sorting and possibly hybridization. This agrees with our clock analysis, which supports a rapid and recent radiation of the clade to which B. dorsalis, B. latifrons and B. tryoni belong. These results provide a new picture of Bactrocera phylogeny that can serve as the basis for future comparative analyses

Valerio, F.; Zadra, N.; Rota-Stabelli, O.; Ometto, L. (2022-06-30). The impact of fast radiation on the phylogeny of Bactrocera fruit flies as revealed by multiple evolutionary models and mutation rate-calibrated clock. INSECTS, 13 (7): 603. doi: 10.3390/insects13070603 handle: https://hdl.handle.net/10449/78677

The impact of fast radiation on the phylogeny of Bactrocera fruit flies as revealed by multiple evolutionary models and mutation rate-calibrated clock

Zadra, Nicola;Rota-Stabelli, Omar;
2022-06-30

Abstract

Several true fruit flies (Tephritidae) cause major damage to agriculture worldwide. Among them, species of the genus Bactrocera are extensively studied to understand the traits associated with their invasiveness and ecology. Comparative approaches based on a reliable phylogenetic framework are particularly effective, but several nodes of the Bactrocera phylogeny are still controversial, especially concerning the reciprocal affinities of the two major pests B. dorsalis and B. tryoni. Here, we analyzed a newly assembled genomic-scaled dataset using different models of evolution to infer a phylogenomic backbone of ten representative Bactrocera species and two outgroups. We further provide the first genome-scaled inference of their divergence by calibrating the clock using fossil records and the spontaneous mutation rate. The results reveal a closer relationship of B. dorsalis with B. latifrons than to B. tryoni, contrary to what was previously supported by mitochondrial-based phylogenies. By employing coalescent-aware and heterogeneous evolutionary models, we show that this incongruence likely derives from a hitherto undetected systematic error, exacerbated by incomplete lineage sorting and possibly hybridization. This agrees with our clock analysis, which supports a rapid and recent radiation of the clade to which B. dorsalis, B. latifrons and B. tryoni belong. These results provide a new picture of Bactrocera phylogeny that can serve as the basis for future comparative analyses
Bactrocera
Bactrocera dorsalis
Bactrocera tryoni
Dating
Incomplete lineage sorting
Phylogenomics
Phylogeny
Settore BIO/05 - ZOOLOGIA
30-giu-2022
Valerio, F.; Zadra, N.; Rota-Stabelli, O.; Ometto, L. (2022-06-30). The impact of fast radiation on the phylogeny of Bactrocera fruit flies as revealed by multiple evolutionary models and mutation rate-calibrated clock. INSECTS, 13 (7): 603. doi: 10.3390/insects13070603 handle: https://hdl.handle.net/10449/78677
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