The benefits of ant-plant-herbivore interactions for the plant depend on the abundance of ants and herbivores and the selective pressures these arthropods exert. In plants bearing extrafloral nectaries (EFN), different mean trait values may be selected for by different populations in response to local herbivore pressure, ultimately resulting in the evolution of differences in plant traits that attract ants as defensive agents against herbivory. To determine if variation in traits that mediate ant-plant interactions reflect herbivore selective pressures, we quantified intra- and inter-population variation in plant traits for eight populations of the EFN-bearing annual Chamaecrista fasciculata (Michx.) (Fabaceae). Censuses in rural and urban areas of Missouri and Illinois (USA) showed population differences in ant attendance and herbivore pressure. Seeds were collected from each population, and plants were grown in a common greenhouse environment to measure sugar production, nectar volume and composition, EFN size and time of emergence, leaf pubescence, and leaf quality throughout plant development. Populations varied mainly in terms of nectary size, sugar production, and nectar volume, but to a lesser degree in leaf pubescence. Populations of C. fasciculata within urban areas (low in insect abundance) had small nectaries and the lowest nectar production. There was a positive correlation across populations between herbivore density and leaf damage by those herbivores on the one hand and sugar production and nectar volume on the other. These results, in conjunction with lack of evidence for maternally based environmental effects, suggest that population differences in herbivore damage have promoted differential evolution of EFN-related traits among populations.

Many Latino horse workers experienced upper and lower respiratory symptoms. Dust mask use may protect workers in this and other enclosed livestock operations from respiratory symptoms.

Occupational heat exposure is associated with substantial morbidity and mortality among outdoor workers. We sought to descriptively evaluate spatiotemporal variability in heat threshold exceedances and describe potential impacts of these exposures for crop and construction workers. We also present general considerations for approaching heat policy-relevant analyses. We analyzed county-level 2011–2020 monthly employment (Bureau of Labor Statistics Quarterly Census of Employment and Wages) and environmental exposure (Parameter-elevation Relationships on Independent Slopes Model (PRISM)) data for Washington State (WA), USA, crop (North American Industry Classification System (NAICS) 111 and 1151) and construction (NAICS 23) sectors. Days exceeding maximum daily temperature thresholds, averaged per county, were linked with employment estimates to generate employment days of exceedances. We found spatiotemporal variability in WA temperature threshold exceedances and crop and construction employment. Maximum temperature exceedances peaked in July and August and were most numerous in Central WA counties. Counties with high employment and/or high numbers of threshold exceedance days, led by Yakima and King Counties, experienced the greatest total employment days of exceedances. Crop employment contributed to the largest proportion of total state-wide employment days of exceedances with Central WA counties experiencing the greatest potential workforce burden of exposure. Considerations from this analysis can help inform decision-making regarding thresholds, timing of provisions for heat rules, and tailoring of best practices in different industries and areas.

Abnormal pulmonary function was high among this vulnerable worker group, suggesting the need for increased dust mask usage and further exposure assessment. Am. J. Ind. Med. 60:35-44, 2017. © 2016 Wiley Periodicals, Inc.

This study investigated the prevalence of self-reported musculoskeletal discomfort (MSD) and work-related factors associated with elevated MSD among Latino thoroughbred farm workers. Participants (N = 225) were recruited using a community-based purposive sampling approach to participate in in-person interviews. Of these workers, 85% experienced MSD. MSD was divided into tertiles; the upper tertile was defined as elevated. Multivariable Poisson regression revealed associations between any elevated MSD and longer tenure on horse farms, longer work hours, and poor safety climate. Elevated neck/back MSD was associated with longer tenure, longer work hours, and poor safety climate. Elevated upper extremity MSD was associated with age and poor safety climate. Elevated lower extremity MSD was associated with longer tenure, longer work hours, and being female. Musculoskeletal discomfort is common among these workers. Improving safety climate and minimizing long work hours is recommended.

Background: Insufficient heat acclimatization is a risk factor for heat-related illness (HRI) morbidity, particularly during periods of sudden temperature increase. We sought to characterize heat exposure on days before, and days of, occupational HRIs.Methods: A total of 1241 Washington State workers' compensation State Fund HRI claims from 2006 to 2021 were linked with modeled parameter-elevation regressions on independent slopes model (PRISM) meteorological data. We determined location-specific maximum temperatures (T max,PRISM ) on the day of illness (DOI) and prior days, and whether the T max,PRISM was ≥10.0°F (~5.6°C) higher than the average of past 5 days ("sudden increase") for each HRI claim. Claims occurring on days with ≥10 HRI claims ("clusters") were compared with "non-cluster" claims using t tests and χ 2 tests.Results: Seventy-six percent of analyzed HRI claims occurred on days with a T max,PRISM ≥ 80°F. Claims occurring on "cluster" days, compared to "non-cluster" days, had both a significantly higher mean DOI T max,PRISM (99.3°F vs. 85.8°F [37.4°C vs. 29.9°C], t(148) = −18, p < 0.001) and a higher proportion of "sudden increase" claims (80.2% vs. 24.3%, χ 2 [1] = 132.9, p < 0.001). Compared to "cluster" days, HRI claims occurring during the 2021 Pacific Northwest "heat dome" had a similar increased trajectory of mean T max,PRISM on the days before the DOI, but with higher mean T max,PRISM.Conclusions: Occupational HRI risk assessments should consider both current temperatures and changes in temperatures relative to prior days. Heat prevention programs should include provisions to address acclimatization and, when increases in temperature occur too quickly to allow for sufficient acclimatization, additional precautions.

Background Thoroughbred horse farm workers self‐report a high frequency of work‐related injuries and pain. However, an analysis of Thoroughbred horse farm workers’ compensation injury claims is absent from the literature, yet may benefit worker safety. Methods We analyzed workers’ compensation insurance firm data containing 2276 claims filed between 2008 and 2015. Injury frequency, cost, and lost time per cause, nature, and body part injured were examined qualitatively and via univariate tests. Factors associated with high cost and high duration lost time claims were modeled via multivariable logistic regression. Results The average Thoroughbred worker claim cost $4,198 and accrued 10 days lost time, involving strikes (57% of total claims), sprains/strains (34%), and wrist/hand injuries (18%). Injuries primarily occurred on mornings (54%), weekdays (79%), and during the transition from breeding to sales (23%). Jobs with a high level of horse contact had significantly higher cost ($6,487) and higher duration lost time (16.8 days) claims, with significantly higher cost claims on the weekends ($6,471) and from the oldest workers ($7466), vs reference groups. Logistic models indicate significantly increased odds of a high‐cost injury among high horse contact jobs (OR = 1.87; 95% C.I. = 1.53‐2.29) and older age tertiles (1.38; 1.08‐1.75; 1.70, 1.32‐2.18). The odds of a high duration lost time injury are significantly increased among high horse contact jobs (1.91; 1.53‐2.39) and males (1.50, 1.13‐1.98), with significantly reduced odds among the most tenured workers (0.74; 0.56‐0.99). Conclusions Our findings elucidate factors to reduce injury frequency, cost, and lost time among Thoroughbred horse farm workers.

We conducted a narrative literature review of U.S. casino occupational health and safety research based on the following inclusion criteria: 1) focused on workers, 2) provided information pertaining to exposures present in the occupational environment (e.g., hazards, stressors, etc.), and 3) pertained to casino, gaming, or gambling workers. Following a multi-step process, a total of 11 articles were identified that related to the occupational health and safety of U.S. casino workers. These articles primarily focused on environmental tobacco smoke (ETS) exposures (n = 7 articles), with the remaining articles related to casino worker risk behaviors (i.e., problem gambling and drinking) (n = 2), and psychosocial stressors (n = 2). Our results demonstrate that the overwhelming consensus in the literature is that ETS leads to high respirable particulate matter (PM2.5), tobacco toxin levels and exposures among gaming employees. Our results also suggest that harassment, low autonomy at work, and unsafe work conditions may be of concern, especially for female workers. We identified major gaps in the casino worker occupational safety literature including a lack of studies that evaluated noise exposure, injury data, ergonomics, psychosocial hazards, or long term respiratory health outcomes related to ETS exposure. Future research regarding the occupational safety and health of U.S. casino workers should address these gaps in the literature.