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Comprehensive phylogeny, biogeography and new classification of the diverse bee tribe Megachilini: Can we use DNA barcodes in phylogenies of large genera?
Mol Phylogenet Evol. 2016 10; 103:245-259.MP

Abstract

Classification and evolutionary studies of particularly speciose clades pose important challenges, as phylogenetic analyses typically sample a small proportion of the existing diversity. We examine here one of the largest bee genera, the genus Megachile - the dauber and leafcutting bees. Besides presenting a phylogeny based on five nuclear genes (5480 aligned nucleotide positions), we attempt to use the phylogenetic signal of mitochondrial DNA barcodes, which are rapidly accumulating and already include a substantial proportion of the known species diversity in the genus. We used barcodes in two ways: first, to identify particularly divergent lineages and thus to guide taxon sampling in our nuclear phylogeny; second, to augment taxon sampling by combining nuclear markers (as backbone for ancient divergences) with DNA barcodes. Our results indicate that DNA barcodes bear phylogenetic signal limited to very recent divergences (3-4 my before present). Sampling within clades of very closely related species may be augmented using this technique, but our results also suggest statistically supported, but incongruent placements of some taxa. However, the addition of one single nuclear gene (LW-rhodopsin) to the DNA barcode data was enough to recover meaningful placement with high clade support values for nodes up to 15 million years old. We discuss different proposals for the generic classification of the tribe Megachilini. Finding a classification that is both in agreement with our phylogenetic hypotheses and practical in terms of diagnosability is particularly challenging as our analyses recover several well-supported clades that include morphologically heterogeneous lineages. We favour a classification that recognizes seven morphologically well-delimited genera in Megachilini: Coelioxys, Gronoceras, Heriadopsis, Matangapis, Megachile, Noteriades and Radoszkowskiana. Our results also lead to the following classification changes: the groups known as Dinavis, Neglectella, Eurymella and Phaenosarus are reestablished as valid subgenera of the genus Megachile, while the subgenus Alocanthedon is placed in synonymy with M. (Callomegachile), the subgenera Parachalicodoma and Largella with M. (Pseudomegachile), Anodonteutricharaea with M. (Paracella), Platysta with M. (Eurymella), and Grosapis and Eumegachile with M. (Megachile) (new synonymies). In addition, we use maximum likelihood reconstructions of ancestral geographic ranges to infer the origin of the tribe and reconstruct the main dispersal routes explaining the current, cosmopolitan distribution of this genus.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Trunz V
Institute of Biology, University of Neuchatel, Emile-Argand 11, 2000 Neuchatel, Switzerland.
Packer L
Department of Biology, York University, 4700 Keele St., Toronto, ON M3J 1P3, Canada.
Vieu J
Institute of Biology, University of Neuchatel, Emile-Argand 11, 2000 Neuchatel, Switzerland.
Arrigo N
Department of Ecology and Evolution, University of Lausanne, Biophore, 1015 Lausanne, Switzerland.
Praz CJ
Institute of Biology, University of Neuchatel, Emile-Argand 11, 2000 Neuchatel, Switzerland. Electronic address: christophe.praz@unine.ch.

MeSH

AnimalsBeesBiological EvolutionCytochromes cDNADNA Barcoding, TaxonomicDNA, MitochondrialLikelihood FunctionsPhylogenyPhylogeographyProtein Serine-Threonine KinasesRNA, Ribosomal, 28SSequence AlignmentSequence Analysis, DNA

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27400629

Citation

Trunz, V, et al. "Comprehensive Phylogeny, Biogeography and New Classification of the Diverse Bee Tribe Megachilini: Can We Use DNA Barcodes in Phylogenies of Large Genera?" Molecular Phylogenetics and Evolution, vol. 103, 2016, pp. 245-259.
Trunz V, Packer L, Vieu J, et al. Comprehensive phylogeny, biogeography and new classification of the diverse bee tribe Megachilini: Can we use DNA barcodes in phylogenies of large genera? Mol Phylogenet Evol. 2016;103:245-259.
Trunz, V., Packer, L., Vieu, J., Arrigo, N., & Praz, C. J. (2016). Comprehensive phylogeny, biogeography and new classification of the diverse bee tribe Megachilini: Can we use DNA barcodes in phylogenies of large genera? Molecular Phylogenetics and Evolution, 103, 245-259. https://doi.org/10.1016/j.ympev.2016.07.004
Trunz V, et al. Comprehensive Phylogeny, Biogeography and New Classification of the Diverse Bee Tribe Megachilini: Can We Use DNA Barcodes in Phylogenies of Large Genera. Mol Phylogenet Evol. 2016;103:245-259. PubMed PMID: 27400629.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comprehensive phylogeny, biogeography and new classification of the diverse bee tribe Megachilini: Can we use DNA barcodes in phylogenies of large genera? AU - Trunz,V, AU - Packer,L, AU - Vieu,J, AU - Arrigo,N, AU - Praz,C J, Y1 - 2016/07/08/ PY - 2016/02/19/received PY - 2016/06/23/revised PY - 2016/07/07/accepted PY - 2016/7/13/entrez PY - 2016/7/13/pubmed PY - 2017/10/5/medline KW - Bees KW - Coelioxys KW - Megachile KW - Phylogenetic signal KW - Species-level phylogeny KW - Taxon sampling SP - 245 EP - 259 JF - Molecular phylogenetics and evolution JO - Mol Phylogenet Evol VL - 103 N2 - Classification and evolutionary studies of particularly speciose clades pose important challenges, as phylogenetic analyses typically sample a small proportion of the existing diversity. We examine here one of the largest bee genera, the genus Megachile - the dauber and leafcutting bees. Besides presenting a phylogeny based on five nuclear genes (5480 aligned nucleotide positions), we attempt to use the phylogenetic signal of mitochondrial DNA barcodes, which are rapidly accumulating and already include a substantial proportion of the known species diversity in the genus. We used barcodes in two ways: first, to identify particularly divergent lineages and thus to guide taxon sampling in our nuclear phylogeny; second, to augment taxon sampling by combining nuclear markers (as backbone for ancient divergences) with DNA barcodes. Our results indicate that DNA barcodes bear phylogenetic signal limited to very recent divergences (3-4 my before present). Sampling within clades of very closely related species may be augmented using this technique, but our results also suggest statistically supported, but incongruent placements of some taxa. However, the addition of one single nuclear gene (LW-rhodopsin) to the DNA barcode data was enough to recover meaningful placement with high clade support values for nodes up to 15 million years old. We discuss different proposals for the generic classification of the tribe Megachilini. Finding a classification that is both in agreement with our phylogenetic hypotheses and practical in terms of diagnosability is particularly challenging as our analyses recover several well-supported clades that include morphologically heterogeneous lineages. We favour a classification that recognizes seven morphologically well-delimited genera in Megachilini: Coelioxys, Gronoceras, Heriadopsis, Matangapis, Megachile, Noteriades and Radoszkowskiana. Our results also lead to the following classification changes: the groups known as Dinavis, Neglectella, Eurymella and Phaenosarus are reestablished as valid subgenera of the genus Megachile, while the subgenus Alocanthedon is placed in synonymy with M. (Callomegachile), the subgenera Parachalicodoma and Largella with M. (Pseudomegachile), Anodonteutricharaea with M. (Paracella), Platysta with M. (Eurymella), and Grosapis and Eumegachile with M. (Megachile) (new synonymies). In addition, we use maximum likelihood reconstructions of ancestral geographic ranges to infer the origin of the tribe and reconstruct the main dispersal routes explaining the current, cosmopolitan distribution of this genus. SN - 1095-9513 UR - https://www.unboundmedicine.com/medline/citation/27400629/Comprehensive_phylogeny_biogeography_and_new_classification_of_the_diverse_bee_tribe_Megachilini:_Can_we_use_DNA_barcodes_in_phylogenies_of_large_genera DB - PRIME DP - Unbound Medicine ER -