Dataset Information

Factors contributing to the accumulation of reproductive isolation: A mixed model approach.

ABSTRACT: The analysis of large datasets describing reproductive isolation between species has been extremely influential in the study of speciation. However, the statistical methods currently used for these data limit the ability to make direct inferences about the factors predicting the evolution of reproductive isolation. As a result, our understanding of iconic patterns and rules of speciation rely on indirect analyses that have clear statistical limitations. Phylogenetic mixed models are commonly used in ecology and evolution, but have not been applied to studies of reproductive isolation. Here I describe a flexible framework using phylogenetic mixed models to analyze data collected at different evolutionary scales, to test both categorical and continuous predictor variables, and to test the effect of multiple predictors on rates and patterns of reproductive isolation simultaneously. I demonstrate the utility of this framework by re-analyzing four classic datasets, from both animals and plants, and evaluating several hypotheses that could not be tested in the original studies: In the Drosophila and Bufonidae datasets, I found support for more rapid accumulation of reproductive isolation in sympatric species pairs compared to allopatric species pairs. Using Silene and Nolana, I found no evidence supporting the hypothesis that floral differentiation elevates postzygotic reproductive isolation. The faster accumulation of postzygotic isolation in sympatry is likely the result of species coexistence determined by the level of postzygotic isolation between species. In addition, floral trait divergence does not appear to translate into pleiotropic effects on postzygotic reproductive isolation. Overall, these methods can allow researchers to test new hypotheses using a single statistical method, while remedying the statistical limitations of several previous methods.

SUBMITTER: Castillo DM

PROVIDER: S-EPMC5552923 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Factors contributing to the accumulation of reproductive isolation: A mixed model approach.

Castillo Dean M DM

Ecology and evolution 20170620 15

The analysis of large datasets describing reproductive isolation between species has been extremely influential in the study of speciation. However, the statistical methods currently used for these data limit the ability to make direct inferences about the factors predicting the evolution of reproductive isolation. As a result, our understanding of iconic patterns and rules of speciation rely on indirect analyses that have clear statistical limitations. Phylogenetic mixed models are commonly use ...[more]

PMID: 28811884

Similar Datasets

Project description:BackgroundAnemia in women of reproductive age is a major public health challenge for low- and middle-income countries with a long-term negative impact on the health of women, their children, and the economic growth of the society. Even though the world health organization targeted a 50% global reduction of anemia among women of reproductive age by 2025, with the current trend it is unlikely to achieve this goal.ObjectiveThis study aimed to assess the prevalence and associated factors of anemia among women of reproductive age in eastern Africa.MethodsA secondary data analysis, using demographic and health survey (DHS) data of 10 eastern African countries, was conducted. For our study, a total weighted sample of 101524 women of reproductive age was used. We employed a multilevel mixed-effects generalized linear model (using Poisson regression with robust error variance). Both unadjusted and adjusted prevalence ratios with their 95% confidence interval were reported.ResultsThe prevalence of anemia in eastern Africa was 34.85 (95%CI: 34.56-35.14) ranging from 19.23% in Rwanda to 53.98% in Mozambique. In the multivariable multilevel analysis, being older age, having primary and above education, being from households with second to highest wealth quantiles, being currently working, not perceiving distance as a big problem, use of modern contraceptive methods, and rural residence was associated with a lower prevalence of anemia. While, being married and divorced/separated/widowed, women from female-headed households, women from households with unimproved toilet facility and unimproved water source, ever had of a terminated pregnancy, having high parity, and being from large household size was associated with a higher prevalence of anemia.ConclusionThe prevalence of anemia in eastern Africa was relatively high. Both individual level and community level factors were associated with the prevalence of anemia in women of reproductive age. Therefore, giving special attention to those women who are at a higher prevalence of anemia such as younger women, those who are from households with low socioeconomic status, unimproved toilet facility, and source of drinking water, as well as pregnant women could decrease anemia in women of reproductive age.

Project description:Hospital isolation rooms are vital for the containment (when under negative pressure) of patients with, or the protection (when under positive pressure) of patients, from airborne infectious agents. Such facilities were essential for the management of highly contagious patients during the 2003 severe acute respiratory syndrome (SARS) outbreaks and the more recent 2009 A/H1N1 influenza pandemic. Many different types of door designs are used in the construction of such isolation rooms, which may be related to the space available and affordability. Using colored food dye as a tracer, the qualitative effects of door-opening motions on the dissemination of potentially contaminated air into and out of a single isolation room were visualized and filmed using Reynolds-number-equivalent, small-scale, water-tank models fitted with programmable door-opening and moving human figure motions. Careful scaling considerations involved in the design and construction of these water-tank models enabled these results to be accurately extrapolated to the full-scale situation. Four simple types of door design were tested: variable speed single and double, sliding and hinged doors, in combination with the moving human figure. The resulting video footage was edited, synchronized and presented in a series of split-screen formats. From these experiments, it is clear that double-hinged doors pose the greatest risk of leakage into or out of the room, followed by (in order of decreasing risk) single-hinged, double-sliding and single-sliding doors. The relative effect of the moving human figure on spreading any potential contamination was greatest with the sliding doors, as the bulk airflows induced were large relative to those resulting from these door-opening motions. However, with the hinged doors, the airflows induced by these door-opening motions were significantly greater. Further experiments involving a simulated ventilated environment are required, but from these findings alone, it appears that sliding-doors are far more effective for hospital isolation room containment.

Project description:IntroductionThere is limited reliable research available on medication errors in relation to paramedic practice, with most evidence-based medication safety guidelines based on research in nursing, operating theatre and pharmacy settings. While similarities exist, evidence suggests that the prehospital environment is distinctly different in many aspects. The prevention of errors requires attention to factors from the organisational and regulatory level down to specific tasks and patient characteristics. The evidence available suggests errors may occur in up to 12.76% of medication administrations in some prehospital settings. With multiple sources stating that the errors are under-reported, this represents significant potential for patient harm. This review will seek to identify the factors influencing the occurrence of medication errors by paramedics in the prehospital environment.Methods and analysisThe review will include qualitative and quantitative studies involving interventions or phenomena regarding medication errors or medication safety relating to paramedics (including emergency medical technicians and other prehospital care providers) within the prehospital environment. A search will be conducted using MEDLINE (Ovid), EBSCOhost Megafile Search, the International Committee of Medical Journal Editors trial registry, Google Scholar and the OpenGrey database to identify studies meeting this inclusion criteria, with initial searches commencing 30 September 2019. Studies selected will undergo assessment of methodological quality, with data to be extracted from all studies irrespective of quality. Each stage of study selection, appraisal and data extraction will be conducted by two reviewers, with a third reviewer deciding any unresolved conflicts. The review will follow a convergent integrated approach, conducting a single qualitative synthesis of qualitative and 'qualitised' quantitative data.Ethics and disseminationNo ethical approval was required for this review. Findings from this systematic review will be disseminated via publications, reports and conference presentations.

Dataset Information

Factors contributing to the accumulation of reproductive isolation: A mixed model approach.

Publications

Factors contributing to the accumulation of reproductive isolation: A mixed model approach.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets