Thomas O. Powers
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View article: Effect of climate history on the genetic structure of an Antarctic soil nematode
Effect of climate history on the genetic structure of an Antarctic soil nematode Open
Historical climate disturbances such as glacial cycling and fluctuating stream, lake, and sea levels strongly influence the distribution and evolutionary trajectories of Antarctic terrestrial species. Antarctic invertebrates, including the…
View article: <i>Diplolaimelloides woaabi</i> sp. n. (Nematoda: Monhysteridae): A Novel Species of Free-Living Nematode from the Great Salt Lake, Utah
<i>Diplolaimelloides woaabi</i> sp. n. (Nematoda: Monhysteridae): A Novel Species of Free-Living Nematode from the Great Salt Lake, Utah Open
A new species of free-living nematode inhabiting microbialites in Great Salt Lake, Utah, USA is described both molecularly by 18S-sequencing and morphologically with scanning electron microscopy and differential interference contrast (DIC)…
View article: Comparative mitochondrial genomics in Nematoda reveal astonishing variation in compositional biases and substitution rates indicative of multi-level selection
Comparative mitochondrial genomics in Nematoda reveal astonishing variation in compositional biases and substitution rates indicative of multi-level selection Open
Background Nematodes are the most abundant and diverse metazoans on Earth, and are known to significantly affect ecosystem functioning. A better understanding of their biology and ecology, including potential adaptations to diverse habitat…
View article: Taxonomy of Tobrilidae species from the Alkaline Lakes of the western Nebraska Sandhills
Taxonomy of Tobrilidae species from the Alkaline Lakes of the western Nebraska Sandhills Open
Six distinct COI mitochondrial Haplotype Groups (HG) are morphologically, ecologically, and genetically characterized from the aquatic nematode family Tobrilidae. Collection locations included the extreme habitats of the Alkaline Lakes in …
View article: Effects of drought-induced stress on nematode communities in aquatic and terrestrial habitats of the Nebraska Sandhills
Effects of drought-induced stress on nematode communities in aquatic and terrestrial habitats of the Nebraska Sandhills Open
Introduction Global change events (e.g., worsening drought) are increasing environmental stress in a variety of terrestrial and aquatic habitats. The degree to which communities in soils and sediments are driven by temporal environmental c…
View article: 18S-NemaBase: Curated 18S rRNA Database of Nematode Sequences
18S-NemaBase: Curated 18S rRNA Database of Nematode Sequences Open
Nematodes are the most abundant and diverse animals on the planet but lack representation in biodiversity research. This presents a problem for studying nematode diversity, particularly when molecular tools (i.e., barcoding and metabarcodi…
View article: Ecological and morphological differentiation among COI haplotype groups in the plant parasitic nematode species <i>Mesocriconema xenoplax</i>
Ecological and morphological differentiation among COI haplotype groups in the plant parasitic nematode species <i>Mesocriconema xenoplax</i> Open
DNA barcoding with the mitochondrial COI gene reveals distinct haplotype subgroups within the monophyletic and parthenogenetic nematode species, Mesocriconema xenoplax . Biological attributes of these haplotype groups (HG) have not been ex…
View article: <i>Plectus</i> of the Prairie: A Case Study of Taxonomic Resolution from a Nematode Biodiversity Survey
<i>Plectus</i> of the Prairie: A Case Study of Taxonomic Resolution from a Nematode Biodiversity Survey Open
Taxonomic resolution is a critical component of biodiversity assessments. In this case study, we examined a single taxon within a larger study of nematode diversity to evaluate the taxonomic resolution of different diversity assessment met…
View article: <i>Pratylenchus smoliki</i>, a new nematode species (Pratylenchidae: Tylenchomorpha) from the Great Plains region of North America
<i>Pratylenchus smoliki</i>, a new nematode species (Pratylenchidae: Tylenchomorpha) from the Great Plains region of North America Open
Pratylenchus smoliki is a new species of root-lesion nematode described from corn-soybean production fields in the Central Great Plains of North America. It is characterized by populations with relatively abundant males, two lip annuli, fe…
View article: Peer Review #3 of "Decoupled recovery of ecological communities after reclamation (v0.1)"
Peer Review #3 of "Decoupled recovery of ecological communities after reclamation (v0.1)" Open
Grassland restoration is largely focused on creating plant communities that match reference conditions.However, these communities reflect only a subset of the biodiversity of grassland systems.We conducted a multi-trophic study to assess e…
View article: A COI DNA barcoding survey of <i>Pratylenchus</i> species in the Great Plains Region of North America
A COI DNA barcoding survey of <i>Pratylenchus</i> species in the Great Plains Region of North America Open
Pratylenchus species are among the most common plant parasitic nematodes in the Great Plains Region of North America. Our goal was to survey Pratylenchus species diversity across the Great Plains region using a mitochondrial COI DNA barcod…
View article: DNA barcoding evidence for the North American presence of alfalfa cyst nematode, <i>Heterodera medicaginis</i>
DNA barcoding evidence for the North American presence of alfalfa cyst nematode, <i>Heterodera medicaginis</i> Open
Specimens of Heterodera have been collected from alfalfa fields in Kearny County, Kansas & Carbon County, Montana. DNA barcoding with the COI mitochondrial gene indicate that the species is not Heterodera glycines , soybean cyst nematode, …
View article: Description of <i>Gracilacus paralatescens</i> n. sp. (Nematoda:Paratylenchinae) found from the rhizosphere of Bamboo in Zhejiang, China
Description of <i>Gracilacus paralatescens</i> n. sp. (Nematoda:Paratylenchinae) found from the rhizosphere of Bamboo in Zhejiang, China Open
Gracilacus paralatescens n. sp., isolated in Anji County, Zhejiang Province, China from the rhizospheric soil of bamboo. The new species can be characterized by the female lateral field with three incisures, stylet 71.5 to 78.8 µm long, li…
View article: Description and Distribution of Three Criconematid Nematodes from Hangzhou, Zhejiang Province, China
Description and Distribution of Three Criconematid Nematodes from Hangzhou, Zhejiang Province, China Open
Populations of Criconemoides parvus , Discocriconemella hengsungica , and Discocriconemella limitanea , isolated in Hangzhou, China from the rhizosphere soil of woody perennials were characterized morphologically and molecularly. The morph…
View article: Discovery and Identification of <i>Meloidogyne</i> Species Using COI DNA Barcoding
Discovery and Identification of <i>Meloidogyne</i> Species Using COI DNA Barcoding Open
DNA barcoding with a new cytochrome oxidase c subunit 1 primer set generated a 721 to 724 bp fragment used for the identification of 322 Meloidogyne specimens, including 205 new sequences combined with 117 from GenBank. A maximum likelihoo…
View article: Species Delimitation and Description of Mesocriconema nebraskense n. sp. (Nematoda: Criconematidae), a Morphologically Cryptic, Parthenogenetic Species from North American Grasslands
Species Delimitation and Description of Mesocriconema nebraskense n. sp. (Nematoda: Criconematidae), a Morphologically Cryptic, Parthenogenetic Species from North American Grasslands Open
Nematode surveys of North American grasslands conducted from 2010 to 2015 frequently recovered a species of crico- nematid nematode morphologically resembling Mesocriconema curvatum. These specimens were recovered from remnant native prair…
View article: An 18S rDNA Perspective on the Classification of Criconematoidea
An 18S rDNA Perspective on the Classification of Criconematoidea Open
In the nematode family Criconematidae, a taxonomy primarily based on cuticle characters has created classifications that are notoriously volatile. Molecular characters may lead to their stabilization. A phylogenetic tree of Criconematoidea…
View article: Species discovery and diversity in Lobocriconema (Criconematidae: Nematoda) and related plant-parasitic nematodes from North American ecoregions
Species discovery and diversity in Lobocriconema (Criconematidae: Nematoda) and related plant-parasitic nematodes from North American ecoregions Open
There are many nematode species that, following formal description, are seldom mentioned again in the scientific literature. Lobocriconema thornei and L. incrassatum are two such species, described from North American forests, respectively…