Anthony D. Mitchell

Anthony D. Mitchell
University of Otago

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38
Publications
9,341
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1,079
Citations
Citations since 2016
0 Research Items
256 Citations
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040

Publications

Publications (38)
Article
Full-text available
A revision of the New Zealand endemic Lepidium oleraceum and allied species is presented. Seventeen species are recognised, 11 of these are new. The new species are segregated on the basis of morphological characters supported by molecular data obtained from three DNA markers (two rDNA and one cpDNA). One species, Lepidium castellanum sp. nov., is...
Article
Full-text available
Molecular genetic analyses were used to reconstruct phylogenetic relationships and estimate divergence times for Raukaua species and their close relatives. A monophyletic group identified as the 'greater Raukaua clade' was circumscribed, with eight representative species; its basal divergence was estimated at c. 70 Mya, possibly after Zealandia had...
Article
Full-text available
The relationships of 35taxa endemic to the Chatham Islands and their close relatives were investigated using DNA sequence data. This study implies that the closest relatives of many of the endemic species are widespread and common species that occur on either of the main New Zealand islands. Hypotheses that the majority of the Chatham Island endemi...
Article
Full-text available
Phylogenetic analyses of nuclear DNA external transcribed spacer (ETS) and chloroplast DNA trnL–trnF markers were undertaken to reconstruct the evolutionary history of the South Pacific genus Melicytus. Bayesian analyses of the ETS sequence data produced a phylogenetic tree with several well supported groups, including clades comprising: (1) specie...
Article
Full-text available
New Zealand species of Geranium are shown to be closely related, forming a monophyl- etic group. Relationships inferred from Bayesian and NeighborNet analyses of internal and external transcribed spacer sequences generally agreed and were congruent with those inferred from study of morphological characters. Two groups of species (G. brevicaule and...
Article
Full-text available
Phylogenetic analyses of ITS sequence data from 70 species and 40 genera of Araliaceae (representing all major lineages within the "core group" of the family) do not support the widely used traditional division of Araliaceae into three tribes. Tribe Aralieae (characterized by imbricate petals) is found nested within a paraphyletic Schefflerieae (wh...
Article
Full-text available
Phylogenetic relationships of New Zealand species of Brassicaceae belonging to the South Island endemic Ischnocarpus, Iti, Notothlaspi, and Pachycladon, and the indigenous Cardamine, Cheesemania, Lepidium, and Rorippa were studied using nuclear ribosomal internal transcribed spacer sequences. Results support a monophyletic Notothlaspi and suggest t...
Article
Full-text available
A data-set from the mitochondrial 12S rRNA gene subunit of 11 Australasian lycosid species (six New Zealand species and five Australian species) was generated. Three North American lycosid species, one European species and one New Zealand pisaurid (outgroup) were also sequenced. The sequence data for the 16 species were combined with the published...
Article
Full-text available
Abstract The amphibian fauna of New Zealand consists of three native species (Leiopelma spp.), and three Litoria species introduced from Australia in the last 140 years. We conducted a molecular phylogeographical study that aimed to identify the Australian origins of two species, Litoria aurea and Litoria raniformis. We used partial sequences of th...
Article
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The South Island, New Zealand, endemics Lepidium sisymbrioides and L. solandri are accepted at species rank. L. solandri Kirk is reinstated and includes L. matau Petrie in synonymy, and L. kawarau is reduced to synonymy of L. sisymbrioides. Twenty‐nine floral and vegetative morphological characters were measured and used for analyses of character v...
Article
The phylogeny of Brassaiopsis (Araliaceae), a morphologically diverse and widely distributed genus in Asia, was estimated based on sequences of the internal transcribed spacer regions (ITS) and 5S nontranscribed spacer (5S-NTS) of the nuclear ribosomal DNA. Two main paralogous copies of 5S-NTS were found for Brassaiopsis but both were not recovered...
Article
Full-text available
Anthropodium bifurcatum is a new species described from northern New Zealand, being currently known from a number of mainland sites as well as offshore islands, including the Poor Knights Islands and Three Kings Islands. It is segregated from A. cirratum and distinguished from that species by its thicker and upright leaves with a fleshy white midri...
Article
Sequence data from a portion of the Granule-Bound Starch Synthase I (GBSSI) gene or waxy, were used to infer the phylogeny of the core Asian Araliaceae clade. The amplified region included exons 10 and 11 together with the intervening intron. The level of intrageneric variation was low (~2%) relative to that among genera (4-5%). Two main paralogous...
Article
Aim To report analyses and propose hypotheses of adaptive radiation that explain distributional patterns of the alpine genus Pachycladon Hook.f. – a morphologically diverse genus from New Zealand closely related to Arabidopsis thaliana. Location South Island, New Zealand. Methods Morphological and nrDNA ITS sequence phylogenies were generated for P...
Article
The Palaearctic parasitoid Microctonus aethiopoides Loan (Hymenoptera: Braconidae) has been introduced to North America for biological control of weevils in the genera Sitona and Hypera (Coleoptera: Curculionidae) and to Australia and New Zealand for control of Sitona discoideus Gyllenhal. Various geographic and host-associated populations of M. ae...
Article
Phylogenetic relationships are inferred from nuclear ribosomal internal transcribed spacer sequences for species belonging to Sophora sect. Edwardsia from South America, New Zealand, Lord Howe Island, Hawai’i, La Réunion, Easter Island, and Raivavae Island (French Polynesia). Results support the monophyly of sect. Edwardsia, but relationships among...
Article
Nuclear ribosomal DNA ITS sequence data were used to assess the relationships of Cheesemania, Ischnocarpus, and Pachycladon to each other and to other genera in the Brassicaceae. Phylogenetic analyses are congruent with other studies that infer the Pachycladon complex (including Pachycladon, Cheesemania, and Ischnocarpus) is monophyletic. The compl...
Article
Full-text available
Species within the Pachycladon complex (Cheesemania fastigiata, C. sp., C. stellata, C. wallii, C. latisiliqua, Pachycladon novae‐zelandiae, Ischnocarpus novae‐zelandiae, and I. exilis) have limited dispersal ability, exist in small isolated and sparsely distributed populations, and have a predominantly selfing breeding system with low pollen‐ovule...
Article
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The blue penguins (genus Eudyptula) have been subjected to extensive taxonomic revision. In 1976, the genus was reduced from 2 species to a single species (Eudyptula minor) with 6 subspecies, based on a morphometric analysis. Despite the later proposed rejection of the differentiation of subspecies in Eudyptula minor, following analysis of allozyme...
Article
A data-set from the mitochondrial 12S rRNA gene subunit of 11 Australasian lycosid species (six New Zealand species and five Australian species) was generated. Three North American lycosid species, one European species and one New Zealand pisaurid (outgroup) were also sequenced. The sequence data for the 16 species were combined with the published...
Article
Amplified Fragment Length Polymorphism (AFLP) analysis was used to generate informative DNA fingerprints from Magnolia denudata, M. liliiflora, and putative cultivars of their hybrid cross, i.e., M. × soulangeana, M. × soulangeana ’Lennei’, M. × soulangeana ’Rustica Rubra’, M. × soulangeana ’Alba’, M. × soulangeana Huby’, and M. × soulangeana ’San...
Article
Full-text available
Nuclear ribosomal DNA sequences are used in phylogenetic analyses to assess relationships of the Chilean Pseudopanax laetevirens. Close relatives of P. laetevirens are P. gunnii, an endemic to Tasmania, Raukaua species from New Zealand, and Cheirodendron tryginum from Hawai'i. Analyses suggest that P. laetevirens is the sister species to P. gunnii....
Article
Phylogenetic relationships of New Zealand species of Brassicaceae belonging to the South Island endemic Ischnocarpus, Iti, Notothlaspi, and Pachycladon, and the indigenous Cardamine, Cheesemania, Lep- idium, and Rorippa were studied using nuclear ribosomal internal transcribed spacer sequences. Results sup- port a monophyletic Notothlaspi and sugge...
Article
A key is provided for 21 species occurring in New Zealand: Agaricus arvensis,A. augustus, A. bambusae var. australis, A. bernardii, A. bisporus var. bisporus, A. bitorquis, A. campestris var. campestris, A. campestris cf. var. floccipes, A. cupreobrunneus, A. horakii, A. impudicus (= A. variegans),A. lanatoniger, A. lanipes,A. meleagris, A. oligocy...
Article
Parsimony and maximum likelihood analyses of sequence data from the internal transcribed spacer (ITS-2) region plus a portion of the 28S gene are used to study the phylogenetic relationships of Agaricus species. The ingroup contained 16 Agaricus species, selected from the range of sections contained in the subgenus Agaricus. A total of eight outgro...
Article
Parsimony and maximum likelihood analyses of sequence data from the internal transcribed spacer (ITS-2) region plus a portion of the 28S gene are used to study the phylogenetic relationships of Agaricus species. The ingroup contained 16 Agaricus species, selected from the range of sections contained in the subgenus Agaricus. A total of eight out-gr...
Article
Full-text available
Challenges to the traditional circumscription of Apiaceae and Araliaceae are emerging as a result of phylogenetic analysis of DNA sequences. Traditionally classified as Araliaceae, Stilbocarpa emerges with Schizeilema and Azorella, both members of the Apiaceae. In our analyses of nuclear ITS sequences, these three genera comprise a distinct Souther...
Article
Full-text available
Population structure, diversity and gene flow in four populations of Aciphylla glaucescens were studied using allozymes. Six of the seven putative loci were polymorphic in at least one population. Within populations the mean percentage of polymorphic loci was 68%. Gene diversity for Aciphylla glaucescens (H(e)=0.258) was greater at the species leve...
Article
Full-text available
Five genera of Australasian apioid Apiaceae (Gingidia, Scandia, Lignocarpa, Anisotome, and Aciphylla) have a complex taxo‐nomic history with the circumscription of, and inferred relationships among, the currently accepted genera based on only morphological characters. This molecular and phylogenetic study focuses on the relationships among the taxa...
Article
The genus Pseudopanax is recognised as polyphyletic. Morphological and anatomical characters are described that support the monophyly of Pseudopanax anomalus, P. edgerleyi, and P. simplex. Reinstatement of the genus Raukaua is recommended to accommodate these species. The new combinations R. anomalus and R. simplex are made.
Article
Basidiospore characters were measured using computer-based image analysis with greater speed (10 x) and objectivity than possible manually. This technology allowed measurement of additional variables for studies of spores, including area and circularity, as well as length, breadth and elongation. Principal component analysis of basidiospore charact...
Article
Full-text available
Sequence data from internal transcribed spacer (ITS) regions of rDNA and data from morphology, cytology and wood anatomy are used to study phylogenetic relationships inPseudopanax. The molecular and non-molecular data are analysed as independent data sets and in combination using parsimony. Results supported the conclusion that the genusPseudopanax...
Article
A review of literature on the classification of the genus Agaricus showed a great deal of confusion exists regarding relationship between species. Traditional methods used in mycological systematics have been inadequate to resolve many problems found when classifying this genus. Thus recourse to new techniques are required. As a result, methods wer...

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