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Global Invasion History of the Fire Ant Solenopsis invicta
TLDR
An assessment of genetic variation at a diverse set of molecular markers in 2144 fire ant colonies from 75 geographic sites worldwide revealed that at least nine separate introductions of S. invicta have occurred into newly invaded areas and that the main southern U.S. population is probably the source of all but one of these introductions.
WOLBACHIA AND THE EVOLUTION OF REPRODUCTIVE ISOLATION BETWEEN DROSOPHILA RECENS AND DROSOPHILA SUBQUINARIA
TLDR
The existence of several mtDNA haplotypes in this species indicates that Wolbachia have been present as a potential isolating mechanism for a substantial period of evolutionary time and it is argued that although WolbachIA by themselves are unlikely to bring about speciation, they can increase the rate of speciation in insects.
A Y-like social chromosome causes alternative colony organization in fire ants
TLDR
It is shown that genomic rearrangements can maintain divergent adaptive social phenotypes involving many genes acting together by locally limiting recombination in a pair of heteromorphic chromosomes that have many of the key properties of sex chromosomes.
Hierarchical analysis of genetic structure in native fire ant populations: results from three classes of molecular markers.
TLDR
Phylogeographic analyses of the mtDNA suggest that recent limitations on gene flow rather than longstanding barriers to dispersal are responsible for this large-scale structure of fire ant populations.
Wolbachia infections in native and introduced populations of fire ants (Solenopsis spp.)
TLDR
The presence of Wolbachia is reported in native South American populations of the fire ant Solenopsisinvicta, but the apparent absence of the bacteria in introduced populations of this pest species in the USA is reported.
Putative native source of the invasive fire ant Solenopsis invicta in the USA
TLDR
This attempt to identify the source(s) of the red imported fire ant (Solenopsis invicta) in the southern USA utilizing data from three classes of genetic markers and employing Bayesian clustering simulations, assignment and exclusion tests, and phylogenetic and population genetic analyses concludes that the Mesopotamia flood plain near Formosa, Argentina represents the most probable source region.
The genome of the fire ant Solenopsis invicta
TLDR
A phylogenetic analysis revealed that an ancestral vitellogenin gene first underwent a duplication that was followed by possibly independent duplications of each of the daughter viteLLogenins, possibly reflecting differential selection acting on the queen and worker castes.
Species delimitation: a case study in a problematic ant taxon.
TLDR
This study uses genetic data from 68 markers, combined with distributional, bioclimatic, and coloration information, to hypothesize boundaries of evolutionarily independent lineages (species) within the widespread and highly variable nominal fire ant species Solenopsis saevissima, a member of a species group containing invasive pests as well as species that are models for ecological and evolutionary research.
Mitochondrial genome evolution in fire ants (Hymenoptera: Formicidae)
TLDR
The first fully sequenced ant mitochondrial genomes are presented and it is provided further evidence that the sampling across many taxonomic levels (including conspecifics and congeners) is useful and important to gain detailed insights into mitogenome evolution.
Decreased Diversity but Increased Substitution Rate in Host mtDNA as a Consequence of Wolbachia Endosymbiont Infection
TLDR
It is shown that maternally transmitted endosymbionts can severely depress levels of mtDNA diversity within an infected host species, while accelerating the rate of divergence among mtDNA lineages in different species.
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