Paper versus Practice: Occupational Health and Safety Protections and Realities for Temporary Foreign Agricultural Workers in Ontario

Over 20,000 temporary foreign agricultural workers come to Ontario each year, primarily from Mexico and the Caribbean. Agricultural workers are exposed to a number of occupational health and safety (OHS) risks. This article discusses the various OHS protections available to workers and their limitations, and analyzes the specific challenges that temporary foreign workers face in accessing rights, such as language and cultural barriers, information gaps, and precarious employment and immigration status. It also analyzes the limitations with respect to OHS training and the provision and use of personal protective equipment, arguing that these protections are under-regulated and inconsistent. The article concludes with recommendations to improve shortcomings, including standardized and specific OHS training, random OHS inspections, and full inclusion of agricultural workers in provincial legislations. Findings are based primarily on interviews with 100 migrant farmworkers who reported injuries or illness, as well as with key stakeholders such as employers and government officials

L’écart entre la théorie et la pratique : les protections en santé et en sécurité au travail et la réalité de la main-d’œuvre étrangère temporaire du domaine agricole en Ontario

Plus de 20 000 travailleurs étrangers temporaires en agriculture affluent chaque année en Ontario, la plupart en provenance du Mexique ou des Caraïbes. Ils sont exposés à de nombreux risques en santé et en sécurité au travail (SST). Les diverses protections en SST disponibles aux travailleurs, ainsi que leurs limites, sont décrites dans l’article. Les problèmes d’accès aux droits auxquels fait face la main-d’œuvre étrangère, à cause, entre autres, des barrières linguistiques ou culturelles, des lacunes dans l’information, de la précarité d’emploi et du statut d’immigrant y sont analysés, ainsi que les faiblesses dans la formation en SST, la disponibilité et l’utilisation de l’équipement de protection personnelle, résultat d’une sous-réglementation et d’incohérences. En conclusion, des recommandations sont apportées pour remédier à ses problèmes : une formation uniforme et propre à la SST, des inspections aléatoires, et la pleine intégration de la main-d’œuvre agricole dans les lois provinciales. Les conclusions sont basées, pour la plupart, sur le résultat d’entrevues menées auprès de 100 travailleurs agricoles migrants ayant déclaré une blessure ou une maladie, et de principaux intervenants tels que les employeurs et les représentants de l’État.Over 20,000 temporary foreign agricultural workers come to Ontario each year, primarily from Mexico and the Caribbean. Agricultural workers are exposed to a number of occupational health and safety (OHS) risks. This article discusses the various OHS protections available to workers and their limitations, and analyzes the specific challenges that temporary foreign workers face in accessing rights, such as language and cultural barriers, information gaps, and precarious employment and immigration status. It also analyzes the limitations with respect to OHS training and the provision and use of personal protective equipment, arguing that these protections are under-regulated and inconsistent. The article concludes with recommendations to improve shortcomings, including standardized and specific OHS training, random OHS inspections, and full inclusion of agricultural workers in provincial legislations. Findings are based primarily on interviews with 100 migrant farmworkers who reported injuries or illness, as well as with key stakeholders such as employers and government officials.Cada año, más de 20.000 trabajadores agrícolas temporales extranjeros vienen a Ontario, principalmente de México y el Caribe. Los trabajadores agrícolas están expuestos a una serie de riesgos de seguridad y salud en el trabajo (SST). Este artículo analiza las diversas formas de protección en SST de las que disponen los trabajadores así como sus limitaciones y analiza los retos específicos que enfrentan los trabajadores extranjeros temporales en el acceso a sus derechos como por ejemplo : las barreras lingüísticas y culturales, la falta de información, y el estatus migratorio y de empleo precario. También se analiza las limitaciones con respecto a la formación en SST y el suministro y uso de equipos de protección individual, con el argumento de que estas formas de protección están insuficientemente reguladas y son inconsistentes. El artículo concluye con recomendaciones para mejorar las deficiencias, estas recomendaciones incluyen : la formación estandarizada y específica en SST, inspecciones de SST de manera aleatoria y la plena inclusión de los trabajadores agrícolas en las leyes provinciales. Los resultados se basan fundamentalmente en entrevistas con 100 trabajadores agrícolas migrantes que han reportado accidentes o enfermedades así como en entrevistas con las principales partes interesadas : empleadores y funcionarios del gobierno

Cancer Morbidity in Lamp Manufacturing Workers

A historical prospective study of cancer in lamp manufacturing workers in one plant was conducted. All men and women who worked for a total of at least 6 months and were employed at some time between 1960 and 1975 were included. Work histories were abstracted and subjects were divided according to whether they had worked in the coiling and wire drawing area (CWD). Cancer morbidity from 1964 to 1982 was ascertained via the provincial registry, and was compared with the site-specific incidence in Ontario, adjusting for age, sex and calendar period. Of particular interest were primary breast and gynecological cancers in women. The cancers of a priori concern were significantly increased in women in CWD, but not elsewhere in the plant. The excess was greatest in those with more than 5 yr exposure (in CWD) and more than 15 yr since first working in CWD, with eight cases of breast and gynecological cancers observed in this category compared with 2.67 expected. Only three cancers occurred in men in CWD. Environmental measurements had not been made in the past and little information was available on substances used in the 1940s and 1950s, the period when the women with the highest excess began employment. It is known that methylene chloride and trichlorethylene have been used, but not enough is known about the dates and patterns of use to draw any conclusions about their relationship with the increase in disease

Using elemental chemostratigraphy on Mid-Late Frasnian platform-top successions from the Lennard Shelf outcrops, Canning Basin, Western Australia.

High-resolution chronostratigraphic correlation using elemental chemostratigraphy in platform carbonates is typically difficult to achieve. Here, elemental chemostratigraphy is used to correlate between two platform-top, carbonate-dominated field sections from the narrow Lennard Shelf that existed on the NE margin of the Canning Basin, Western Australia, during the mid–late Frasnian. The correlation, constrained by magnetic polarity reversals and physical ground truthing, is based on recognition of distinctive cyclical ‘‘stacking patterns’’ defined by changes in concentrations of the trace element zirconium (Zr). Zr concentrations are controlled by the amount of the heavy mineral zircon in the sediments, which is derived from a terrigenous source and is diagenetically very stable. The stacking patterns in the lower part of the study sections display gradually upward-increasing values of Zr to a maximum, followed by an almost immediate fall to a minimum. In the upper part of the study interval, the cycles are more symmetrical, with both gradually increasing and decreasing portions. The point at which the change in Zr stacking pattern occurs in the two sections is synchronous and occurs in association with a supersequence maximum flooding surface. The correlation based on maximum and minimum Zr values throughout the two sections is demonstrated to be chronostratigraphic by comparison with correlations based upon paleomagnetism and physical ground truthing. When element ratios commonly used as provenance and paleoclimate proxies are plotted, the variations between closely spaced samples are greater than any systematic variations throughout the study intervals. Therefore, no isochemical chemozones can be defined, implying that during deposition of the study intervals, there were no long-lived changes in sediment provenance or paleoclimate that the elemental chemistry can detect. The work presented here shows that the standard approach of defining isochemical chemozones for chemostratigraphic correlation is not always appropriate. However, an approach using cyclical changes in elemental variables for chemostratigraphic correlation between two closely spaced sections is chronostratigraphically valid. The greater challenge is in application of the same approach to more widely spaced sections, potentially in different facies of a carbonate setting

Upper Kellwasser carbon isotope excursion pre-dates the F–F boundary in the Upper Devonian Lennard shelf carbonate system, Canning Basin, Western Australia

Here we report four high-resolution carbon isotope records in addition to trace element data for the Frasnian–Famennian (F–F) boundary interval in the Lennard Shelf carbonate system of the Canning Basin, Western Australia. This region lacks the characteristic black shale horizons associated with the global Late Devonian Kellwasser extinction events, yet still exhibits a trend in carbon isotope character similar to what has been reported from elsewhere in the world (two positive δ13C excursions with ~3–4‰ amplitudes). Enrichments in select trace element ratios suggest that both excursions are related to periods of oxygen deprivation and perhaps increased biological productivity. Given the continuous and stratigraphically expanded nature of Lennard Shelf sections, together with high-density sampling constrained by both conodont biostratigraphy and magnetostratigraphy, we observe that the Upper Kellwasser isotope excursion (maximum δ13C values) and associated trace element enrichments occur distinctly lower than the F–F boundary level. These results have implications for the paleoenvironmental conditions leading up to the Late Devonian Mass Extinction in terms of ocean chemistry and circulation patterns. This data set allows for a rare, detailed look at the temporal relationship between the Kellwasser events and the F–F boundary and constrains the pattern of carbon isotope perturbations at the intra-zonal scale

Software Citation Implementation Challenges

The main output of the FORCE11 Software Citation working group (https://www.force11.org/group/software-citation-working-group) was a paper on software citation principles (https://doi.org/10.7717/peerj-cs.86) published in September 2016. This paper laid out a set of six high-level principles for software citation (importance, credit and attribution, unique identification, persistence, accessibility, and specificity) and discussed how they could be used to implement software citation in the scholarly community. In a series of talks and other activities, we have promoted software citation using these increasingly accepted principles. At the time the initial paper was published, we also provided guidance and examples on how to make software citable, though we now realize there are unresolved problems with that guidance. The purpose of this document is to provide an explanation of current issues impacting scholarly attribution of research software, organize updated implementation guidance, and identify where best practices and solutions are still needed

High-Resolution Late Devonian Magnetostratigraphy From the Canning Basin, Western Australia: A Re-Evaluation

Late Devonian time was a period of rapid upheaval in the Earth system, including climate change, sea level changes, widespread ocean anoxia, and the Frasnian-Famennian mass extinction; the cause(s) of these changes remain(s) uncertain. The Lennard Shelf of the Canning Basin in Western Australia contains carbonate reef sections spanning much of the Late Devonian Epoch and has been sampled for paleomagnetic analysis with studies by Hansma and colleagues in 2015 and Playton and colleagues in 2016. However, previous paleomagnetic directions were scattered and their use for magnetostratigraphy has been questioned. Here, rock magnetic data and magnetostratigraphy for a late Devonian drill-core from the Lennard Shelf were analyzed. Three magnetostratigraphic interpretations were made using different paleopoles that showed good correlation with each other and the earlier interpretations by Playton and colleagues in 2016. Additionally, the rock magnetic data revealed the samples contain various mixtures of detrital and diagenetic minerals, the former of which should be viable recorders of primary magnetic signatures. Even in samples with these detrital phases, paleomagnetic data were often noisy and produced ambiguous polarity assignments, likely due to the anomalously weak Devonian field. Because of this ambiguity and the absence of a robust paleopole, broader correlations for this critical time-period will be difficult without additional paleomagnetic data from the late Devonian Period. Expanded data for this interval could eventually shed light on the timing, causes, and rates of the Frasnian-Famennian mass extinction and other environmental shifts in the late Devonian Epoch

Integrated stratigraphic correlation of Upper Devonian platform-to-basin carbonate sequences, Lennard Shelf, Canning Basin, Western Australia: advances in carbonate margin-to-slope sequence stratigraphy and stacking patterns

High-resolution, time-significant correlations are integral to meaningful stratigraphic frameworks in depositional systems, but may be difficult to achieve using traditional sequence stratigraphic or biostratigraphic approaches alone, particularly in geologically complex settings. In steep, reefal carbonate margin-to-slope systems, such correlations are essential to unravel shelf-to-basin transitions, characterize strike variability, and develop predictive sequence stratigraphic models – concepts which are currently poorly understood in these heterogeneous settings. The Canning Basin Chronostratigraphy Project (CBCP) integrates multiple independent datasets (including biostratigraphy, magnetostratigraphy, stable isotope chemostratigraphy, and sequence stratigraphy) extracted from Upper Devonian (Frasnian and Famennian) reefal platform exposures along the Lennard Shelf, Canning Basin, Western Australia. These were used to generate a well-constrained stratigraphic framework and shelf-to-basin composite reconstruction of the carbonate system. The resultant integrated framework allows for unprecedented analysis of carbonate margin-to-slope heterogeneity, depositional architecture, and sequence stratigraphy along the Lennard Shelf. Systems tract architecture, facies partitioning, and stacking patterns of margin to lower-slope environments were assessed for six composite-scale sequences that form part of a transgressive-to-regressive supersequence and span the Frasnian-Famennian (F-F) biotic crisis. Variations are apparent in margin styles, foreslope facies proportions, dominant resedimentation processes, downslope contributing sediment factories, and vertical rock successions, related to hierarchical accommodation signals and ecological changes associated with F-F boundary. We present these results in the form of carbonate margin-to-basin sequence stratigraphic models and associations that link seismic-scale architecture to fine-scale facies heterogeneity. These models provide a predictive foundation for characterization of steep-sided flanks of reefal carbonate platform systems that is useful for both industry and academia. This study emphasizes the utility of an integrated stratigraphic approach and the insights gained from better-constrained facies and stratal architecture analysis; insights that were not achievable with traditional sequence stratigraphic or biostratigraphic techniques alone

Choosing a Survey Sample When Data on the Population Are Limited: A Method Using Global Positioning Systems and Aerial and Satellite Photographs

Background Various methods have been proposed for sampling when data on the population are limited. However, these methods are often biased. We propose a new method to draw a population sample using Global Positioning Systems and aerial or satellite photographs. Results We randomly sampled Global Positioning System locations in designated areas. A circle was drawn around each location with radius representing 20 m. Buildings in the circle were identified from satellite photographs; one was randomly chosen. Interviewers selected one household from the building, and interviews were conducted with eligible household members. Conclusions Participants had known selection probabilities, allowing proper estimation of parameters of interest and their variances. The approach was made possible by recent technological developments and access to satellite photographs. &nbsp

Quality of care in for-profit and not-for-profit nursing homes: systematic review and meta-analysis

Objective To compare quality of care in for-profit and not-for-profit nursing homes