25 results on '"Boyer SL"'
Search Results
2. Machine learning approaches delimit cryptic taxa in a previously intractable species complex.
- Author
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Heine HLA, Derkarabetian S, Morisawa R, Fu PA, Moyes NHW, and Boyer SL
- Subjects
- Animals, Phylogeny, Machine Learning, New Zealand, Arachnida, Spiders
- Abstract
Cryptic species are not diagnosable via morphological criteria, but can be detected through analysis of DNA sequences. A number of methods have been developed for identifying species based on genetic data; however, these methods are prone to over-splitting taxa with extreme population structure, such as dispersal-limited organisms. Machine learning methodologies have the potential to overcome this challenge. Here, we apply such approaches, using a large dataset generated through hybrid target enrichment of ultraconserved elements (UCEs). Our study taxon is the Aoraki denticulata species complex, a lineage of extremely low-dispersal arachnids endemic to the South Island of Aotearoa New Zealand. This group of mite harvesters has been the subject of previous species delimitation studies using smaller datasets generated through Sanger sequencing and analytical approaches that rely on multispecies coalescent models and barcoding gap discovery. Those analyses yielded a number of putative cryptic species that seems unrealistic and extreme, based on what we know about species' geographic ranges and genetic diversity in non-cryptic mite harvesters. We find that machine learning approaches, on the other hand, identify cryptic species with geographic ranges that are similar to those seen in other morphologically diagnosable mite harvesters in Aotearoa New Zealand's South Island. We performed both unsupervised and supervised machine learning analyses, the latter with training data drawn either from animals broadly (vagile and non-vagile) or from a custom training dataset from dispersal-limited harvesters. We conclude that applying machine learning approaches to the analysis of UCE-derived genetic data is an effective method for delimiting species in complexes of low-vagility cryptic species, and that the incorporation of training data from biologically relevant analogues can be critically informative., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)
- Published
- 2024
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3. When focus and vision become a nightmare: Bottom-line mentality climate, shared vision, and unit unethical conduct.
- Author
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Resick CJ, Lucianetti L, Mawritz MB, Choi JY, Boyer SL, and D'Innocenzo L
- Subjects
- Humans, Dreams, Social Behavior
- Abstract
Drawing on goal shielding theory (Shah et al., 2002), our study highlights the roles of bottom-line mentality climates and shared vision in encouraging collective unethical conduct in pursuit of financial results. Consistent with the theory, we hypothesize that high bottom-line mentality leaders shape their unit's bottom-line mentality climate by explicitly clarifying the importance of prioritizing financial results above all else and using motivational resources to encourage a sole focus on bottom-line attainment. We further hypothesize that a unit's shared vision, which captures a collective sense of purpose and direction, is a critical aspect of the unit's motivational context that increases the likelihood for collective bottom-line enhancing, unethical behaviors (i.e., concealing errors, bribery, and unethical pro-organizational behavior) in units with a salient bottom-line mentality climate. We test our hypotheses in a two-wave, multi-industry field study of work units in central Italy ( N = 96). Results indicate that leaders with a bottom-line mentality foster a bottom-line mentality climate in the units they lead, and the linkages with unit unethical conduct are dependent on the unit's shared vision. While shared vision strengthened the effects of bottom-line mentality climates on concealing errors, it served as a necessary condition to motivate more severe forms of unethical conduct. Our study thus demonstrates a dark side to shared vision in that it channels motivational resources toward a unit's bottom-line priorities. When those priorities are singularly focused on the bottom line, shared vision can help to motivate undesirable behavior. (PsycInfo Database Record (c) 2023 APA, all rights reserved).
- Published
- 2023
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4. By Nature, We're Doers and Problem Solvers: Evolving Job Demands and Resources in Response to COVID-19 Among US-Based Fire Service Personnel (The RAPID Study II).
- Author
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Castro KC, Fisher AB, Geczik AM, Boyer SL, Resick CJ, Lee J, Davis AL, Taylor JA, and Allen JA
- Subjects
- Child, Humans, Mental Health, Emotions, Focus Groups, Qualitative Research, Job Satisfaction, COVID-19 epidemiology
- Abstract
Objective: The US fire service experienced increased demands due to COVID-19. This qualitative study explored the pandemic's impact on work-life balance and safety., Methods: Five interviews and 10 focus groups were conducted with 15 fire departments in the COVID-19 RAPID Mental Health Assessment. Coding and multilevel content analysis were conducted in NVivo., Results: Four department support themes were identified: emotional/social (33.1%), policy (28.4%), instrumental (22.9%), and informational (15.5%). Four work-life balance themes were identified: life (51.2%), children (18.1%), physiological (16.5%), and work (14.2%). We observed more departmental resources to help mitigate job demands within the work environment compared with those for work-life demands., Conclusions: Job resources are needed to mitigate demands and improve safety culture and mental well-being of the fire service under normal conditions, and for the next pandemic, natural disaster, or long-term emergency., Competing Interests: Conflict of interest: None declared., (Copyright © 2023 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American College of Occupational and Environmental Medicine.)
- Published
- 2023
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5. Phylogeography reveals the complex impact of the Last Glacial Maximum on New Zealand's terrestrial biota.
- Author
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Marske KA and Boyer SL
- Abstract
We review the major phylogeographic patterns in Aotearoa New Zealand's terrestrial flora and fauna that have been associated with the Ōtira Glaciation of the Pleistocene, the end of which coincides with the global Last Glacial Maximum (LGM). We focus on (1) the complexity of biogeographic histories of New Zealand species, with LGM-driven phenomena overlaying the impacts of mountain-building and other drivers of phylogeographic structure; (2) the locations of glacial refugia and sets of taxa which may have shared refugia; and (3) the role of glaciation in driving diversification. We end with a brief focus on the next directions, including what can we learn about New Zealand's glacial history by expanding our phylogeographic toolbox to include genomic methods and hypothesis-driven inference methods. We provide follow-up questions which take advantage of the wealth of phylogeographic data for New Zealand., Competing Interests: No potential conflict of interest was reported by the author(s)., (© 2022 The Royal Society of New Zealand.)
- Published
- 2022
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6. The dilemma of self-citation in taxonomy.
- Author
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Zeppelini D, Dal Molin A, Lamas CJE, Sarmiento C, Rheims CA, Fernandes DRR, Lima EFB, Silva EN, Carvalho-Filho F, Kováč Ľ, Montoya-Lerma J, Moldovan OT, Souza-Dias PGB, Demite PR, Feitosa RM, Boyer SL, Weiner WM, and Rodrigues WC
- Subjects
- Authorship, Bibliometrics
- Published
- 2021
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7. There is no evidence that Podoctidae carry eggs of their own species: Reply to Machado and Wolff (2017).
- Author
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Sharma PP, Oberski JT, Santiago MA, Kriebel R, Lipps SM, Buenavente PAC, Diesmos AC, Janda M, Boyer SL, Clouse RM, and Wheeler WC
- Subjects
- Animals, Male, Sequence Alignment, Spiders genetics, Arachnida, Phylogeny
- Abstract
In our recent publication (Sharma et al., 2017), we tested the hypothesis that eggs attached to the legs of male Podoctidae (Opiliones, Laniatores) constituted a case of paternal care, using molecular sequence data in tandem with multiple sequence alignments to test the prediction that sequences of the eggs and the adults that carried them would indicate conspecific identity. We discovered that the sequences of the eggs belonged to spiders, and thus rejected the paternal care hypothesis for these species. Machado and Wolff (2017) recently critiqued our work, which they regarded as a non-critical interpretation and over-reliance on molecular sequence data, and defended the traditional argument that the eggs attached to podoctids are in fact harvestman eggs. Here we show that additional molecular sequence data also refute the identity of the eggs as conspecific harvestman eggs, using molecular cloning techniques to rule out contamination. We show that individual gene trees consistently and reliably place the egg and adult sequences in disparate parts of the tree topology. Phylogenetic methods consistently place all egg sequences within the order Araneae (spiders). We submit that evidence for the paternal care hypothesis based on behavioral, morphological, and natural history approaches is either absent or insufficient for concluding that the eggs of podoctids are conspecific., (Copyright © 2017 Elsevier Inc. All rights reserved.)
- Published
- 2018
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8. A dated molecular phylogeny of mite harvestmen (Arachnida: Opiliones: Cyphophthalmi) elucidates ancient diversification dynamics in the Australian Wet Tropics.
- Author
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Oberski JT, Sharma PP, Jay KR, Coblens MJ, Lemon KA, Johnson JE, and Boyer SL
- Subjects
- Animals, Bayes Theorem, Biodiversity, DNA, Mitochondrial genetics, Geography, Likelihood Functions, Queensland, Rainforest, Time Factors, Humidity, Mites classification, Mites genetics, Phylogeny, Tropical Climate
- Abstract
Austropurcellia, a genus of dispersal-limited arachnids endemic to isolated patches of coastal rainforest in Queensland, Australia, has a remarkable biogeographic history. The genus is a member of the family Pettalidae, which has a classical temperate Gondwanan distribution; previous work has suggested that Austropurcellia is an ancient lineage, with an origin that predates Gondwanan rifting. Subsequently, this lineage has persisted through major climatic fluctuations, such as major aridification during the Miocene and contraction and fragmentation of forest habitats during the Last Glacial Maximum (LGM). In order to understand Austropurcellia's evolutionary and biogeographic history, we generated DNA sequences from both mitochondrial and nuclear loci and combined this information with previously published datasets for the globally-distributed suborder Cyphophthalmi (i.e., all mite harvestmen). We generated phylogenetic trees using maximum likelihood and Bayesian approaches to date divergences using a relaxed molecular clock. According to our estimates, the family Pettalidae diversified in the late Jurassic, in accordance with Gondwanan vicariance. Within Pettalidae, Austropurcellia split from its sister group in the early Cretaceous and began to diversify some 15 Ma later. Therefore, its presence in Australia predates continental rifting-making it one of very few hypothesized examples of Gondwanan vicariance that have withstood rigorous testing. We found a steady rate of diversification within the genus, with no evidence for a shift in rate associated with Miocene aridification. Ages of splits between species predate the Pleistocene, consistent with a "museum" model in which forest refugia acted to preserve existing lineages rather than drive speciation within the group., (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Published
- 2018
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9. Nuptial gift chemistry reveals convergent evolution correlated with antagonism in mating systems of harvestmen (Arachnida, Opiliones).
- Author
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Kahn PC, Cao DD, Burns M, and Boyer SL
- Abstract
Nuptial gifts are material donations given from male to female before or during copulation and are subject to sexual selection in a wide variety of taxa. The harvestman genus Leiobunum has emerged as a model system for understanding the evolution of reproductive morphology and behavior, as transitions between solicitous and antagonistic modes of courtship have occurred multiple times within the lineage and are correlated with convergence in genital morphology. We analyzed the free amino acid content of nuptial gift secretions from five species of Leiobunum using gas chromatography-mass spectrometry. Multivariate analysis of the free amino acid profiles revealed that, rather than clustering based on phylogenetic relationships, nuptial gift chemical composition was better predicted by genital morphology and behavior, suggesting that convergent evolution has acted on the chemical composition of the nuptial gift. In addition, we found that, species with solicitous courtship produce gifts consisting of a 19% larger proportion of essential amino acids as compared to those with more antagonistic courtship interactions. This work represents the first comparative study of nuptial gift chemistry within a phylogenetic framework in any animal group and as such contributes to our understanding of the evolution of reproductive diversity and the participant role of nuptial gift chemistry in mating system transitions.
- Published
- 2018
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10. Variation in Mating Dynamics across Five Species of Leiobunine Harvestmen (Arachnida: Opliones).
- Author
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Fowler-Finn KD, Boyer SL, Ikagawa R, Jeffries T, Kahn PC, Larsen EM, Lee D, and Smeester M
- Abstract
The study of mating choices often focuses on correlates of traits to the overall outcome of a mating interaction. However, mating interactions can proceed through a series of stages, with opportunities for assessment at each stage. We compared whether male or female size predicted mating interaction outcome across several stages of mating in five species of North American leiobunine harvestmen (commonly known as daddy longlegs). Leiobunine harvestmen have been previously shown to exhibit incredible morphological diversity consistent with a spectrum of male⁻female antagonism. Across all of the species, we found a general progression of female size predicting the outcome (success and timing) of early stages of interactions, and male size or male size relative to female size predicting the outcome and timing of later stages of interactions. We also found that size was not a strong predictor of outcome in the two species on the lower end of the antagonism spectrum. The variation in how female and male size predicted outcomes across species and stages of mating suggests that multiple mechanisms may operate to shape mating dynamics within and across species. Given the close relatedness of the species studied, the patterns we uncovered suggest a rapid evolution of the traits and processes predicting the outcome of mating interactions.
- Published
- 2018
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11. A revised dated phylogeny of scorpions: Phylogenomic support for ancient divergence of the temperate Gondwanan family Bothriuridae.
- Author
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Sharma PP, Baker CM, Cosgrove JG, Johnson JE, Oberski JT, Raven RJ, Harvey MS, Boyer SL, and Giribet G
- Subjects
- Animals, Bayes Theorem, Biodiversity, Biological Evolution, Fossils, Genetic Loci, Phylogeny, Scorpions genetics, Scorpions classification
- Abstract
The scorpion family Bothriuridae occupies a subset of landmasses formerly constituting East and West temperate Gondwana, but its relationship to other scorpion families is in question. Whereas morphological data have strongly supported a sister group relationship of Bothriuridae and the superfamily Scorpionoidea, a recent phylogenomic analysis recovered a basal placement of bothriurids within Iurida, albeit sampling only a single exemplar. Here we reexamined the phylogenetic placement of the family Bothriuridae, sampling six bothriurid exemplars representing both East and West Gondwana, using transcriptomic data. Our results demonstrate that the sister group relationship of Bothriuridae to the clade ("Chactoidea" + Scorpionoidea) is supported by the inclusion of additional bothriurid taxa, and that this placement is insensitive to matrix completeness or partitioning by evolutionary rate. We also estimated divergence times within the order Scorpiones using multiple fossil calibrations, to infer whether the family Bothriuridae is sufficiently old to be characterized as a true Gondwanan lineage. We show that scorpions underwent ancient diversification between the Devonian and early Carboniferous. The age interval of the bothriurids sampled (a derived group that excludes exemplars from South Africa) spans the timing of breakup of temperate Gondwana., (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Published
- 2018
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12. New records of harvestmen (Arachnida, Opiliones) from Minnesota, USA.
- Author
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Shoemaker AK, Burns M, and Boyer SL
- Subjects
- Animals, Ecosystem, Minnesota, Arachnida
- Abstract
Harvestmen (Opiliones) are a diverse order of arachnids composed of more than 6,600 described species which together span an almost global distribution. Although these animals may occur in extremely high abundance in both pristine and disturbed habitats, much of harvestman diversity remains undescribed, undocumented, and/or in need of taxonomic attention. In the current study, we focus on the harvestman diversity of the state of Minnesota, USA, where a lack of local expertise and effort has left the species richness of the state largely undocumented. We document two genera and seven species previously unrecorded in the state.-Leiobunum aldrichi, L. calcar, L. flavum, L. politum, L. ventricosum, L. vittatum, and Odiellus pictus.
- Published
- 2017
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13. A multilocus phylogeny of Podoctidae (Arachnida, Opiliones, Laniatores) and parametric shape analysis reveal the disutility of subfamilial nomenclature in armored harvestman systematics.
- Author
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Sharma PP, Santiago MA, Kriebel R, Lipps SM, Buenavente PAC, Diesmos AC, Janda M, Boyer SL, Clouse RM, and Wheeler WC
- Subjects
- Animals, Arachnida anatomy & histology, Arachnida genetics, Arachnida growth & development, Bayes Theorem, Cytochromes c classification, Cytochromes c genetics, Cytochromes c metabolism, DNA chemistry, DNA isolation & purification, DNA metabolism, Male, Ovum metabolism, Phylogeny, RNA, Ribosomal, 16S classification, RNA, Ribosomal, 16S genetics, RNA, Ribosomal, 16S metabolism, Sequence Alignment, Sequence Analysis, DNA, Arachnida classification
- Abstract
The taxonomy and systematics of the armored harvestmen (suborder Laniatores) are based on various sets of morphological characters pertaining to shape, armature, pedipalpal setation, and the number of articles of the walking leg tarsi. Few studies have tested the validity of these historical character systems in a comprehensive way, with reference to an independent data class, i.e., molecular sequence data. We examined as a test case the systematics of Podoctidae, a family distributed throughout the Indo-Pacific. We tested the validity of the three subfamilies of Podoctidae using a five-locus phylogeny, and examined the evolution of dorsal shape as a proxy for taxonomic utility, using parametric shape analysis. Here we show that two of the three subfamilies, Ibaloniinae and Podoctinae, are non-monophyletic, with the third subfamily, Erecananinae, recovered as non-monophyletic in a subset of analyses. Various genera were also recovered as non-monophyletic. As first steps toward revision of Podoctidae, the subfamilies Erecananinae Roewer, 1912 and Ibaloniinae Roewer, 1912 are synonymized with Podoctinae Roewer, 1912 new synonymies, thereby abolishing unsubstantiated subfamilial divisions within Podoctidae. We once again synonymize the genus Paralomanius Goodnight & Goodnight, 1948 with Lomanius Roewer, 1923 revalidated. We additionally show that eggs carried on the legs of male Podoctidae are not conspecific to the males, falsifying the hypothesis of paternal care in this group., (Copyright © 2016 Elsevier Inc. All rights reserved.)
- Published
- 2017
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14. New species of Austropurcellia, cryptic short-range endemic mite harvestmen (Arachnida, Opiliones, Cyphophthalmi) from Australia's Wet Tropics biodiversity hotspot.
- Author
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Jay KR, Popkin-Hall ZR, Coblens MJ, Oberski JT, Sharma PP, and Boyer SL
- Abstract
The genus Austropurcellia is a lineage of tiny leaf-litter arachnids that inhabit tropical rainforests throughout the eastern coast of Queensland, Australia. The majority of their diversity is found within the Wet Tropics rainforests of northeast Queensland, an area known for its exceptionally high levels of biodiversity and endemism. Studying the biogeographic history of limited-dispersal invertebrates in the Wet Tropics can provide insight into the role of climatic changes such as rainforest contraction in shaping rainforest biodiversity patterns. Here we describe six new species of mite harvestmen from the Wet Tropics rainforests, identified using morphological data, and discuss the biogeography of Austropurcellia with distributions of all known species. With this taxonomic contribution, the majority of the known diversity of the genus has been documented.
- Published
- 2016
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15. Current practices in the monitoring of cardiac rhythm devices in pediatrics and congenital heart disease.
- Author
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Boyer SL, Silka MJ, and Bar-Cohen Y
- Subjects
- Adolescent, Child, Child, Preschool, Defibrillators, Implantable adverse effects, Female, Follow-Up Studies, Heart Defects, Congenital physiopathology, Humans, Male, Pacemaker, Artificial adverse effects, Pediatrics methods, Practice Guidelines as Topic, Telephone, Time Factors, Treatment Outcome, Electrocardiography methods, Heart Defects, Congenital therapy, Heart Rate, Telemetry instrumentation
- Abstract
Although guidelines for routine follow-up of pacemakers and implantable cardioverter defibrillators (ICDs) are available for adults, minimal data supports their appropriateness in pediatrics and congenital heart disease. This study aimed to define current practices of cardiac rhythm device (CRD) follow-up among pediatric electrophysiologists. Pediatric and Congenital EP Society (PACES) members were surveyed regarding frequency of CRD in-person follow-up as well as transtelephonic monitoring (TTM) and remote monitoring (RM) practices. If home monitoring was used, the effect on in-person follow-up was also evaluated. A total of 106 PACES members responded to the survey. Uncomplicated pacemaker and ICD patients were both followed in-person at a median interval of 6 months (range 1-12 months). TTM was utilized by 67 % of responders (median interval 3 months; range 1-6 months), while RM was used by 87 % for pacemakers (median interval 3 months; range 1-6 months) and 92 % for ICDs (median interval 3 months; range 2 weeks-6 months). When TTM was used, 21 % of responders reduced their frequency of pacemaker clinic visits. In comparison, RM reduced the frequency of clinic visits for pacemakers and ICDs in 32 and 31 % of responders, respectively. Patient age was an independent factor in determining CRD follow-up for 49 % of responders. While CRD follow-up by pediatric electrophysiologists in general follows adult guidelines, individual practices widely vary. In contrast to published recommendations in adults, TTM and RM utilization does not reduce the frequency of in-person visits for the majority of pediatric electrophysiologists.
- Published
- 2015
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16. New species of mite harvestmen from southeast Queensland, Australia greatly extend the known distribution of the genus Austropurcellia (Arachnida, Opiliones, Cyphophthalmi).
- Author
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Popkin-Hall ZR and Boyer SL
- Subjects
- Animal Distribution, Animal Structures anatomy & histology, Animal Structures growth & development, Animals, Body Size, Ecosystem, Female, Male, Mites anatomy & histology, Mites growth & development, Organ Size, Mites classification
- Abstract
Austropurcellia Juberthie 1988 is a genus of mite harvestmen previously known from numerous localities in the Wet Tropics of northern Queensland and from one locality in central Queensland, Australia. As a result of the current study, the genus is now also known from localities in far southeast Queensland. We describe three new species of Austropurcellia from museum lots: A. acuta sp. nov., A. barbata sp. nov., and A. superbensis sp. nov. Each new species is known from only one to two localities, and from very few specimens. In addition, we describe a pair of previously overlooked dorsal anterior cuticular structures that may be sensory in nature and are found in all Austropurcellia specimens examined, including both new and previously described species. We present a new distribution map of Austropurcellia, greatly expanding its known range to almost the entire east coast of Queensland, and discuss the biogeography of the genus.
- Published
- 2014
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17. Murray to the Mountains intern training program: involvement of small health services.
- Author
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Best JB, Boyer SL, De Lacy CJ, Phillips JS, Welch TM, and McColl GJ
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- Adult, Australia, Female, General Practice economics, General Practice standards, Health Services standards, Humans, Internship and Residency economics, Internship and Residency standards, Male, Surveys and Questionnaires, Clinical Competence, General Practice organization & administration, Internship and Residency organization & administration, Rural Population
- Published
- 2014
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18. Deep genetic divergences in Aoraki denticulata (Arachnida, Opiliones, Cyphophthalmi): a widespread 'mite harvestman' defies DNA taxonomy.
- Author
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Boyer SL, Baker JM, and Giribet G
- Subjects
- Animals, Arachnida classification, Arachnida genetics, Arachnida ultrastructure, Arthropods classification, Arthropods ultrastructure, DNA, Mitochondrial chemistry, Geography, Microscopy, Electron, Scanning, Molecular Sequence Data, New Zealand, Phylogeny, Sequence Analysis, DNA, Arthropods genetics, DNA, Mitochondrial genetics, Genetic Variation
- Abstract
Aoraki denticulata (Arachnida, Opiliones, Cyphophthalmi, Pettalidae), a widespread 'mite harvestman' endemic to the South Island of New Zealand, is found in leaf littler habitats throughout Nelson and Marlborough, and as far south as Arthur's Pass. We investigated the phylogeography and demographic history of A. denticulata in the first genetic population-level study within Opiliones. A total of 119 individuals from 17 localities were sequenced for 785 bp of the gene cytochrome c oxidase subunit I; 102 of these individuals were from the Aoraki subspecies A. denticulata denticulata and the remaining 17 were from the subspecies A. denticulata major. An extraordinarily high degree of genetic diversity was discovered in A. denticulata denticulata, with average uncorrected p-distances between populations as high as 19.2%. AMOVA, average numbers of pairwise differences, and pairwise F(ST) values demonstrated a significant amount of genetic diversity both within and between populations of this subspecies. Phylogenetic analysis of the data set revealed many well-supported groups within A. denticulata denticulata, generally corresponding to clusters of specimens from single populations with short internal branches, but separated by long branches from individuals from other populations. No haplotypes were shared between populations of the widespread small subspecies, A. denticulata denticulata. These results indicate a subspecies within which very little genetic exchange occurs between populations, a result consistent with the idea that Cyphophthalmi are poor dispersers. The highly structured populations and deep genetic divergences observed in A. denticulata denticulata may indicate the presence of cryptic species. However, we find a highly conserved morphology across sampling localities and large genetic divergences within populations from certain localities, equivalent to those typically found between populations from different localities. Past geological events may have contributed to the deep genetic divergences observed between sampling localities; additionally, the high divergence within populations of A. denticulata denticulata suggests that the rate of COI evolution may be accelerated in this taxon. In contrast, the larger subspecies A. denticulata major shows much less differentiation between and within sampling localities, suggesting that it may disperse more easily than its smaller counterpart. The fact that the remarkable genetic divergences within populations of A. denticulata denticulata from certain localities are equivalent to divergences between localities poses a challenge to the rapidly spreading practice of DNA taxonomy.
- Published
- 2007
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19. A new model Gondwanan taxon: systematics and biogeography of the harvestman family Pettalidae (Arachnida, Opiliones, Cyphophthalmi), with a taxonomic revision of genera from Australia and New Zealand.
- Author
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Boyer SL and Giribet G
- Abstract
The phylogeny of the temperate Gondwanan harvestman family Pettalidae is investigated by means of a new morphological matrix of 45 characters, and DNA sequence data from five markers, including two nuclear ribosomal genes (18S rRNA and 28S rRNA), one nuclear protein coding gene (histone H3), and two mitochondrial genes-one protein coding (cytochrome c oxidase subunit I) and one ribosomal (16S rRNA). Phylogenetic analyses using an array of homology schemes (dynamic and static), criteria (parsimony and maximum likelihood), and sampling strategies (optimal trees versus Bayesian phylogenetics) all agree on the monophyly of Pettalidae as well as several of its subclades, each of which is restricted to a modern landmass. While most genera as traditionally defined are monophyletic, Rakaia and Neopurcellia, distributed across Queensland (Australia) and New Zealand, are not. Instead, the species from Queensland, previously described under three genera, constitute a well-supported clade, suggesting that in this case biogeography prevails over traditional taxonomy. A taxonomic emendation of the genera from Queensland and New Zealand is presented, and the new genus Aoraki is erected to include the species of the New Zealand denticulata group. A biogeographical hypothesis of the relationships of the former temperate Gondwana landmasses (with the exception of Madagascar) is presented, although ambiguity in the deep nodes of the pettalid tree renders such inference provisional. The data suggest that neither the South African fauna, the New Zealand fauna nor the Australian fauna is monophyletic but instead monophyly is found at smaller geographic scales (e.g., Western Australia, Queensland, NE South Africa)., (© The Willi Hennig Society 2007.)
- Published
- 2007
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20. The genus Cyphophthalmus (Arachnida, Opiliones, Cyphophthalmi) in Europe: a phylogenetic approach to Balkan Peninsula biogeography.
- Author
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Boyer SL, Karaman I, and Giribet G
- Subjects
- Animals, DNA, Mitochondrial genetics, Europe, Eastern, Nuclear Proteins genetics, Ribosomal Proteins genetics, Arthropods classification, Arthropods genetics, Geography, Phylogeny
- Abstract
In this study, we present phylogenetic data to characterize the relationships among sironids centered in the Balkan region, and use these results to discuss biogeographical aspects of sironid evolution. Analysis of ca. 4.5 kb of sequence data from three nuclear and two mitochondrial genes reveals monophyly of a Balkan clade for which we resurrect the name Cyphophthalmus, considered a junior synonym of Siro for over a century. This clade diversified into several groups, and at least three of them--the duricorius group, the serbicus group, and the minutus group--are well corroborated by the data as monophyletic lineages. The members of the different groups, mostly living in troglobitic environments, have diversified in overlapping geographic regions, with evidence of an eastern origin for the group. Our data also suggest that mitochondrial and nuclear genes are all contributing towards the final resolution of the combined analysis of the data.
- Published
- 2005
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21. The HL7 Clinical Document Architecture.
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Dolin RH, Alschuler L, Beebe C, Biron PV, Boyer SL, Essin D, Kimber E, Lincoln T, and Mattison JE
- Subjects
- Computer Communication Networks standards, Humans, Medical Record Linkage standards, Medical Records Systems, Computerized classification, Programming Languages, Semantics, Terminology as Topic, Medical Records Systems, Computerized standards
- Abstract
Many people know of Health Level 7 (HL7) as an organization that creates health care messaging standards. Health Level 7 is also developing standards for the representation of clinical documents (such as discharge summaries and progress notes). These document standards make up the HL7 Clinical Document Architecture (CDA). The HL7 CDA Framework, release 1.0, became an ANSI-approved HL7 standard in November 2000. This article presents the approach and objectives of the CDA, along with a technical overview of the standard. The CDA is a document markup standard that specifies the structure and semantics of clinical documents. A CDA document is a defined and complete information object that can include text, images, sounds, and other multimedia content. The document can be sent inside an HL7 message and can exist independently, outside a transferring message. The first release of the standard has attempted to fill an important gap by addressing common and largely narrative clinical notes. It deliberately leaves out certain advanced and complex semantics, both to foster broad implementation and to give time for these complex semantics to be fleshed out within HL7. Being a part of the emerging HL7 version 3 family of standards, the CDA derives its semantic content from the shared HL7 Reference Information Model and is implemented in Extensible Markup Language. The HL7 mission is to develop standards that enable semantic interoperability across all platforms. The HL7 version 3 family of standards, including the CDA, are moving us closer to the realization of this vision.
- Published
- 2001
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22. Is the 16S-23S rRNA internal transcribed spacer region a good tool for use in molecular systematics and population genetics? A case study in cyanobacteria.
- Author
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Boyer SL, Flechtner VR, and Johansen JR
- Subjects
- Base Sequence, Classification, Cyanobacteria classification, DNA chemistry, DNA genetics, Electrophoresis, Agar Gel, Genetic Variation, Molecular Sequence Data, Phylogeny, Polymerase Chain Reaction, Sequence Alignment, Sequence Analysis, DNA, Sequence Homology, Nucleic Acid, Cyanobacteria genetics, DNA, Ribosomal Spacer genetics, RNA, Ribosomal, 16S genetics, RNA, Ribosomal, 23S genetics
- Abstract
We amplified, TA-cloned, and sequenced the 16S-23S internal transcribed spacer (ITS) regions from single isolates of several cyanobacterial species, Calothrix parietina, Scytonema hyalinum, Coelodesmium wrangelii, Tolypothrix distorta, and a putative new genus (isolates SRS6 and SRS70), to investigate the potential of this DNA sequence for phylogenetic and population genetic studies. All isolates carried ITS regions containing the sequences coding for two tRNA molecules (tRNA and tRNA). We retrieved additional sequences without tRNA features from both C. parietina and S. hyalinum. Furthermore, in S. hyalinum, we found two of these non-tRNA-encoding regions to be identical in length but different in sequence. This is the first report of ITS regions from a single cyanobacterial isolate not only different in configuration, but also, within one configuration, different in sequence. The potential of the ITS region as a tool for studying molecular systematics and population genetics is significant, but the presence of multiple nonidentical rRNA operons poses problems. Multiple nonidentical rRNA operons may impact both studies that depend on comparisons of phylogenetically homologous sequences and those that employ restriction enzyme digests of PCR products. We review current knowledge of the numbers and kinds of 16S-23S ITS regions present across bacterial groups and plastids, and we discuss broad patterns congruent with higher-level systematics of prokaryotes.
- Published
- 2001
- Full Text
- View/download PDF
23. Item validity of the Myers-Briggs Type Indicator.
- Author
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Tzeng OC, Outcalt D, Boyer SL, Ware R, and Landis D
- Abstract
The present study presents a brief summary of four extensive psychometric analyses of the Myers-Briggs Type Indicator (MBTI) items. Positive empirical evidence supports the MBTI item validity. However, several measurement issues on item construction were raised to caution the future users.
- Published
- 1984
- Full Text
- View/download PDF
24. The spouse's adjustment to chronic pain: cognitive and emotional factors.
- Author
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Block AR and Boyer SL
- Subjects
- Adult, Chronic Disease, Cognition, Emotions, Factor Analysis, Statistical, Humans, MMPI, Marriage, Social Behavior, Social Perception, Adaptation, Psychological, Pain psychology
- Abstract
Recent research has demonstrated that the pain behaviors displayed by patients who have chronic pain complaints can be rewarded and maintained by the solicitous and attentive responses of spouses. The present study examines cognitive and emotional factors which may underly such solicitous responding by the spouses. In this study spouses completed a questionnaire (The Spouses' Perception of Disease--SPOD) which was designed to determine their perceptions of the patients' chronic pain syndromes. Additionally spouses completed a measure of emotional and psychological functioning (SCL-90) and a measure of marital satisfaction (Locke-Wallace Scale). The results of this study show that spouse's cognitive interpretation of the patient's chronic pain syndrome is closely associated with the spouse's emotional adjustment and marital satisfaction. Optimism, perception that the patient has a positive attitude along with few psychological problems and the perception that the patient is severely disabled all are associated with more positive emotional status in spouses. The results are discussed in terms of their implications for the rehabilitation of chronic pain patients.
- Published
- 1984
- Full Text
- View/download PDF
25. Decompensated strabismus.
- Author
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Hiatt RL, Boyer SL, and Cope-Troupe C
- Subjects
- Accommodation, Ocular, Adolescent, Adult, Age Factors, Aged, Child, Diplopia etiology, Female, Humans, Male, Middle Aged, Strabismus physiopathology, Strabismus surgery, Visual Acuity, Strabismus complications
- Published
- 1979
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