TY - JOUR
T1 - Inverse dispersal patterns in a group of ant parasitoids (Hymenoptera
T2 - Eucharitidae: Oraseminae) and their ant hosts
AU - Baker, Austin J.
AU - Heraty, John M.
AU - Mottern, Jason
AU - Zhang, Junxia
AU - Hines, Heather M.
AU - Lemmon, Alan R.
AU - Lemmon, Emily Moriarty
N1 - Funding Information:
We thank Roger Burks, Scott Heacox and Krissy Dominguez for their contributions to this research. We thank Sean Holland and Michelle Kortyna at the Center for Anchored Phylogenomics for their assistance in collecting and analysing the AHE data. Many individuals have contributed specimens and biological data in support of this research, but we would like to extend special thanks to Wendy Porras, Javier Torréns, Laura Varone and Eric Yabar for their assistance with collecting in Central and South America. Support was provided by the Harry Scott Smith Biological Control Award to AJB, the Robert and Peggy van den Bosch Memorial Scholarship to AJB, USDA National Institute of Food and Agriculture Hatch project 1015803 to JMH, and National Science Foundation grants (DEB 1257733 and 1555808) to JMH. The authors declare there are no conflicts of interest.
Publisher Copyright:
© 2019 The Royal Entomological Society
PY - 2020/1/1
Y1 - 2020/1/1
N2 - When postulating evolutionary hypotheses for diverse groups of taxa using molecular data, there is a tradeoff between sampling large numbers of taxa with a few Sanger-sequenced genes or sampling fewer taxa with hundreds to thousands of next-generation-sequenced genes. High taxon sampling enables the testing of evolutionary hypotheses that are sensitive to sampling bias (i.e. dating, biogeography and diversification analyses), whereas high character sampling improves resolution of critical nodes. In a group of ant parasitoids (Hymenoptera: Eucharitidae: Oraseminae), we analyse both of these types of datasets independently (203 taxa with five Sanger loci, 92 taxa with 348 anchored hybrid enrichment loci) and in combination (229 taxa, 353 loci) to explore divergence dating, biogeography, host relationships and differential rates of diversification. Oraseminae specialize as parasitoids of the immature stages of ants in the subfamily Myrmicinae (Hymenoptera: Formicidae), with ants in the genus Pheidole being their most common and presumed ancestral host. A general assumption is that the distribution of the parasite must be limited by any range contraction or expansion of its host. Recent studies support a single New World to Old World dispersal pattern for Pheidole at c. 11–27 Ma. Using multiple phylogenetic inference methods (parsimony, maximum likelihood, dated Bayesian and coalescent analyses), we provide a robust phylogeny showing that Oraseminae dispersed in the opposite direction, from Old World to New World, c. 24–33 Ma, which implies that they existed in the Old World before their presumed ancestral hosts. Their dispersal into the New World appears to have promoted an increased diversification rate. Both the host and parasitoid show single unidirectional dispersals in accordance with the presence of the Beringian Land Bridge during the Oligocene, a time when the changing northern climate probably limited the dispersal ability of such tropically adapted groups.
AB - When postulating evolutionary hypotheses for diverse groups of taxa using molecular data, there is a tradeoff between sampling large numbers of taxa with a few Sanger-sequenced genes or sampling fewer taxa with hundreds to thousands of next-generation-sequenced genes. High taxon sampling enables the testing of evolutionary hypotheses that are sensitive to sampling bias (i.e. dating, biogeography and diversification analyses), whereas high character sampling improves resolution of critical nodes. In a group of ant parasitoids (Hymenoptera: Eucharitidae: Oraseminae), we analyse both of these types of datasets independently (203 taxa with five Sanger loci, 92 taxa with 348 anchored hybrid enrichment loci) and in combination (229 taxa, 353 loci) to explore divergence dating, biogeography, host relationships and differential rates of diversification. Oraseminae specialize as parasitoids of the immature stages of ants in the subfamily Myrmicinae (Hymenoptera: Formicidae), with ants in the genus Pheidole being their most common and presumed ancestral host. A general assumption is that the distribution of the parasite must be limited by any range contraction or expansion of its host. Recent studies support a single New World to Old World dispersal pattern for Pheidole at c. 11–27 Ma. Using multiple phylogenetic inference methods (parsimony, maximum likelihood, dated Bayesian and coalescent analyses), we provide a robust phylogeny showing that Oraseminae dispersed in the opposite direction, from Old World to New World, c. 24–33 Ma, which implies that they existed in the Old World before their presumed ancestral hosts. Their dispersal into the New World appears to have promoted an increased diversification rate. Both the host and parasitoid show single unidirectional dispersals in accordance with the presence of the Beringian Land Bridge during the Oligocene, a time when the changing northern climate probably limited the dispersal ability of such tropically adapted groups.
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U2 - 10.1111/syen.12371
DO - 10.1111/syen.12371
M3 - Article
AN - SCOPUS:85067462376
VL - 45
SP - 1
EP - 19
JO - Systematic Entomology
JF - Systematic Entomology
SN - 0307-6970
IS - 1
ER -