Christopher Randle

Christopher Randle
Sam Houston State University | SHSU · Department of Biological Sciences

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47
Publications
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Introduction
Skills and Expertise

Publications

Publications (47)
Article
Full-text available
Morphological approaches often fail to delimit species in recently derived species complexes. This can be exacerbated in historical collections which may have lost key features in specimen preparation and preservation. Here, we examine the Pedicularis siphonantha complex, endemic to the Mountains of Southwest China. This complex is characterized by...
Article
Full-text available
The millions of herbarium specimens in collections around the world provide historical resources for phylogenomics and evolutionary studies. Many rare and endangered species exist only as historical specimens. Here, we report a case study of the monotypic Pseudobartsia yunnanensis (= Pseudobartsia glandulosa: Orobanchaceae) known from a single Chin...
Article
Full-text available
Christisonia kwangtungensis is a new combination proposed in this study on the basis of both molecular andmorphological evidence. The basionym, Gleadovia kwangtungensis, was subsumed into Christisonia hookeri by Zhang in 1986. Because the type material of C. hookeri lacks important diagnostic characters and no fresh materials from Sikkim were avail...
Article
Full-text available
The oak mistletoe (Phoradendron leucarpum, Viscaceae) is well-documented to exhibit preference for a few potential host species in a given locality, even when many potential host species are present. In trying to explain this distribution, we examined the mechanisms by which mistletoe seedlings recognize potentially suitable hosts in the Piney Wood...
Article
Full-text available
Phtheirospermum (Orobanchaceae), a hemiparasitic genus of Eastern Asia, is characterized by having long and viscous glandular hairs on stems and leaves. Despite this unifying character, previous phylogenetic analyses indicate that Phtheirospermum is polyphyletic, with Phtheirospermum japonicum allied with tribe Pedicularideae and members of the Ph....
Conference Paper
Full-text available
Interpretive Summary Cynodon dactylon is a warm season perennial grass native to the African continent. It was likely introduced to the U.S. in the 1700s, and was documented as an important forage grass in the U.S. by 1807 (USDA Fact Sheet, 2000). Now grown across most of the southern United States, it is widely utilized for turf and forage purpose...
Conference Paper
Full-text available
Many parasitic plants are characterized specialized organs (i.e. haustoria) by which they obtain water and/or nutrients from host plants. There are around 4000 parasitic flowering species placed in 12 orders and 19 families. Of them, about 90% of parasitic species (in four orders) retain photosynthetic capability (hemiparasites), while 10% of paras...
Article
Advances in plant genomics have had an impact on the field of forensic botany. However, the use of pollen DNA profiling in forensic investigations has yet to be applied. Five volunteers wore a jacket with Pinus echinata pollen-containing cotton swatches for a 14-day period. Pollen decay was evaluated at days 0, 3, 6, 9 and 14 by microscopy. Pollen...
Article
The greater power of parametric methods over parsimony is frequently observed in empirical phylogenetic analyses by providing greater resolution and higher branch support. This greater power is provided by several different factors, including some that are generally regarded as disadvantageous. In this study we used both empirical and (modified) si...
Article
Effects of urbanization on genetic diversity, gene flow, and population structure in the ornate box turtle (Terrapene ornata) Abstract. Large-scale declines in North American box turtle (Terrapene spp.) populations have been attributed to habitat fragmentation as a result of urbanization. We compared microsatellite markers and mitochondrial control...
Conference Paper
The heterogeneity of blow fly (Diptera: Calliphoridae) species and populations across heterogeneous environments is a vital concept of basic biology that has a dramatic impact in forensic entomology and the assumptions forensic entomologists infer. Accurate determination of the post mortem interval using the initial colonizing blow fly relies on wh...
Data
Full-text available
Citation: Raghavendra R, Randle CP, Bucheli SR (2011) Identification of a Death-scene Maggot using Standardized Molecular Methods: Sarcophagabullata Parker 1916 (Sarcophagidae) Out-numbers Blowflies (Calliphoridae) on an Urban Cadaver in Southeastern Texas. J Forensic Res 2:133. Abstract In forensic entomology,fly data including maggot age are freq...
Article
Full-text available
The largespring Gambusia, Gambusia geiseri, is a stenohaline livebearing fish (Poeciliidae) native to the headwaters of the San Marcos and Comal Rivers, Texas. After introductions for mosquito control (circa 1930), founder populations persisted in several cool water spring systems throughout west Texas, making them invasive and ideal for studies in...
Article
The objective Bayesian approach relies on the construction of prior distributions that reflect ignorance. When topologies are considered equally probable a priori, clades cannot be. Shifting justifications have been offered for the use of uniform topological priors in Bayesian inference. These include: (i) topological priors do not inappropriately...
Article
Summary Originally described within Harveya, H. alba Hepper was transferred to Alectra, and nearly accommodated in its own monotypic genus. Recently published phylogenetic analyses support the placement of this species within Harveya as originally suggested by Hepper. The transfer is made here, and Harveya wysockiana is synonymised with H. alba.
Article
Full-text available
The tropical clade of Orobanchaceae contains approximately forty genera, typically with fewer than ten species each, and contributes significantly to the variation in floral morphology found within the family. Despite the economic importance of this clade, which contains three of four most important genera of crop parasites within the family, it ha...
Article
The tropical clade of Orobanchaceae contains approximately forty genera, typically with fewer than ten species each, and contributes significantly to the variation in floral morphology found within the family. Despite the economic importance of this clade, which contains three of four most important genera of crop parasites within the family, it ha...
Conference Paper
Late instar maggots collected feeding from human remains found in the metropolitan Houston, TX area were identified as Sarcophaga bullata Parker using published molecular methods. Identification of the maggots allowed for maggot age determination and subsequent determination of the minimum period of insect activity (PIA).
Article
Full-text available
Growing evidence suggests that North American Box Turtles (Terrapene spp.) are declining at an increasing rate. However, there is currently a large gap in our general knowledge of box turtles; thus, baseline demographic and genetic data are needed before a conservation plan can be developed for this group. Therefore, we developed ten microsatellite...
Article
Full-text available
Analysis of cpDNA matK sequences for a total of 43 members of the succulent plant family Crassulaceae, including 24 taxa of Crassula, recovered a well-supported clade comprising Crassula species that is sister to the remainder of the family. The resulting topologies do not support the monophyly of the currently recognized subgenera of Crassula, as...
Article
We isolated and characterized eight polymorphic microsatellite loci for a Texas population of three-toed box turtle, Terrapene carolina triunguis, using a refined hybridization capture procedure. All eight primer pairs amplified successfully at all loci in seven Texas ornate box turtles (T. ornata ornata). Due to the decline and conservation concer...
Article
Full-text available
A phylogenetic study of tribe Coreopsideae (Asteraceae) was conducted using sequences from two plastid regions matK and the trnL-trnF spacer, and nuclear ITS. Analyses of the plastid and ITS datasets result in similar topologies; thus these data partitions were combined and reanalyzed, resulting in a more highly resolved estimate of phylogeny. The...
Article
Full-text available
Plant molecular systematic studies of closely related taxa have relied heavily on sequence data from nuclear ITS and cpDNA. Positive attributes of using ITS sequence data include the rapid rate of evolution compared to most plastid loci and availability of universal primers for amplification and sequencing. On the other hand, ITS sequence data may...
Article
Full-text available
The large and diverse genus Penstemon (ca. 271 species) is endemic to North America and has been divided into six subgenera primarily based on anther dehiscence patterns. Species of Penstemon are known to be pollinated by a variety of insects (hymenopterans, lepidopterans, dipterans) and hummingbirds. Nucleotide sequence data from ITS and two nonco...
Article
The use and design of prior distributions that reflect prior ignorance have long been controversial in statistics. The use of any prior distribution marks the difference be- tween Bayesian and frequentist schools of thought. Dis- agreements regarding the design of prior distributions to reflect ignorance, and the interpretation of posterior dis- tr...
Article
Harveya (Orobanchaceae) is a genus of root holoparasites native to Africa, Madagascar, and Yemen. Of 41 validly published species names attributed to Harveya, 25 apply to the 13 recognized species endemic to southern Africa. In the present study, a taxonomy of the southern African species is presented based on field and herbarium study, and a preli...
Chapter
Advanced glycation end-products (AGEs) accumulate to extremely high levels on tissue and plasma proteins of uremic patients. In order to define differences between uremia and health, we modeled the rates of formation of Amadori product (as furosine) and the chemically defined AGEs pentosidine and Nɛ-(carboxymethyl)lysine(CML) in vitro. Both pentosi...
Article
Full-text available
The evolution of holoparasitism decreases the adaptive value of genes maintaining the photosynthetic apparatus. These may become pseudogenes through insertion or deletion events resulting in frameshift mutations, or by the evolution of premature stop codons. The holoparasitic sister genera Harveya and Hyobanche have undergone alternate pathways of...
Article
Full-text available
Crassulaceae includes approximately 35 genera and 1500 species of leaf and stem succulent flowering plants. The family is nearly cosmopolitan in distribution, but is particularly diverse in southern Africa, where five genera comprising approximately 325 species are found. One of these genera, Cotyledon, includes 10 species that are largely confined...
Article
Orobanchaceae, as it is currently defined, includes all levels of parasitic ability ranging from nonparasitic (Lindenbergia) to facultative and obligate hemiparasites to obligate holoparasites. Several genera are of economic importance as crop weeds and have been studied by scientists interested in developing methods of control, but most genera hav...
Article
While Bayesian analysis has become common in phylogenetics, the effects of topological prior probabilities on tree inference have not been investigated. In Bayesian analyses, the prior probability of topologies is almost always considered equal for all possible trees, and clade support is calculated from the majority rule consensus of the approxima...
Article
The chloroplast genome has provided sequence data for inferring plant phylogenies for more than a decade. General operational assumptions regarding chloroplast gene sequences are that they are single-copy, under strong functional constraint, and uniparentally inherited. However, studies have demonstrated the transfer of large segments of the chloro...
Article
Full-text available
In this paper we use hypothetical and empirical data matrices to evaluate the ability of relative apparent synapomorphy analysis (RASA) to measure phylogenetic signal, select outgroups, and identify terminals subject to long-branch attraction. In all cases, except for equal character-state frequencies, RASA indicated extraordinarily high levels of...
Article
A phylogenetic study was conducted on current members (Chelone, Chionophila, Keckiella, Nothochelone, Pennellianthus, Penstemon, and Tetranema) and former members (Collinsia, Freylinia, Halleria, Russelia, Scrophularia, Tonella) of tribe Cheloneae to test for monophyly, examine biogeographic patterns, and assess relationships of Cheloneae to genera...
Article
The systematic relationships of four species in the South African holoparasitic genus Hyobanche were examined using inter-simple sequence repeat (ISSR) banding patterns and nucleotide sequence data from nuclear ribosomal ITS regions and the plastid gene rbcL. Ordination of ISSR data revealed discrete groups, although H. glabrata and H. rubra were i...
Article
To study levels of proinflammatory cytokines in pleural fluid during the severe ovarian hyperstimulation syndrome (OHSS). Case report. Tertiary academic medical center. A 35-year-old female with a 6-year history of unexplained infertility on menotropin therapy and 28 healthy normal controls. Thoracentesis for severe pleural effusion and venipunctur...

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