Andrew D. Austin

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The arrangement of tRNA genes at the junction of the cytochrome oxidase II and ATPase 8 genes was examined across a broad range of Hymenoptera. Seven distinct arrangements of tRNA genes were identified among a group of wasps that have diverged over the last 180 Myr (suborder Apocrita); many of the rearrangements represent evolutionarily independent events.(More)
Nucleotide sequences from a variety of sources display compositional bias (e. This bias in the proportion of the four nucleotides in a particular DNA fragment was originally thought to arise from mutational bias in the interconversion of adenine-thymine (AT) and gua-nine-cytosine (GC) base pairs (Sueoka 1962). However, the mechanism whereby compositional(More)
Terrestrial life in Antarctica has been described as some of the simplest on the planet, and mainly confined to soil microfaunal communities. Studies have suggested that the lack of diversity is due to extreme environmental conditions and thought to be driven by abiotic factors. In this study we investigated soil microfauna composition, abundance, and(More)
Comprehensive phylogenetic analyses utilize data from distinct sources, including nuclear, mitochondrial, and plastid molecular sequences and morphology. Such heterogeneous datasets are likely to require distinct models of analysis, given the different histories of mutational biases operating on these characters. The incongruence length difference (ILD)(More)
The nearly complete mitochondrial (mt) genome of an egg parasitoid, Trissolcus basalis (Wollaston), was sequenced using both 454 and Illumina next-generation sequencing technologies. A portion of the noncoding region remained unsequenced, possibly owing to the presence of repeats. The sequenced portion of the genome is 15,768 bp and has a high A+T content(More)
The regressive evolution of eyes has long intrigued biologists yet the genetic underpinnings remain opaque. A system of discrete aquifers in arid Australia provides a powerful comparative means to explore trait regression at the genomic level. Multiple surface ancestors from two tribes of diving beetles (Dytiscidae) repeatedly invaded these calcrete(More)
Recombination has been proposed as a possible mechanism to explain mitochondrial (mt) gene rearrangements, although the issue of whether mtDNA recombination occurs in animals has been controversial. In this study, we sequenced the entire mt genome of the megaspilid wasp Conostigmus sp., which possessed a highly rearranged mt genome. The sequence of the(More)
Desert mound springs of the Great Artesian Basin in central Australia maintain an endemic fauna that have historically been considered ubiquitous throughout all of the springs. Recent studies, however, have shown that several endemic invertebrate species are genetically highly structured and contain previously unrecognised species, suggesting that(More)
The Australasian and southwest Pacific species of Oxyscelio (Hymenoptera: Platygastridae s.l.) are revised. A total of 80 species are recognized as valid, 13 of which are redescribed: O. atricoxa (Dodd), O. concoloripes (Dodd), O. flavipes (Kieffer), O. grandis (Dodd), O. hyalinipennis (Dodd), O. magniclava (Dodd), O. mirellus (Dodd), O. montanus (Dodd), O.(More)