Division of labor among a cohort of young individuals in a primitively eusocial wasp

Age polyethism has recently been demonstrated in the primitively eusocial wasp Ropalidia marginata, and it has been shown that workers allocate tasks based more on their relative age rather than on their absolute age, thus providing flexibility to division of labor. The flexibility of division of labor and the respective roles of absolute and relative ages is further evaluated here by creating colonies of only young individuals (young-cohort colonies). The results show that workers in young-cohort colonies can forage at an earlier age, in larger numbers and with a higher probability and frequency. This confirms that division of labor in the colony can indeed be independent of absolute age. The results also show that relative age governs the probability of task performance while absolute age governs the frequency of task performance. The constraints posed by absolute age in the organization of work in an insect colony and the flexibility lent to it by relative age are discussed

‘Face-to Face vs. Flipped’: A Comparative Study on Academic Outcomes and Learning Preferences in First Year Allied Health Students Undertaking Anatomy and Physiology

[EN] A mixed-mode or ‘‘flipped’’ model of learning focusses on supporting a high level of student engagement, student motivation, and the transferability of specific course content. A blend of online resources and face-to-face (F2F) learning facilitates meaningful interaction between peers, while building a capacity for self-directed and lifelong learning. Within the School of Medical Science, Anatomy and Physiology (A&P) content was ‘flipped’ for delivery at a new campus to align with the traditional F2F offering. Lectures were delivered online, while tutorials and practicums were F2F.. Collaborative learning opportunities utilizing active learning pedagogies was appealing and was integrated during the re-alignment of A&P which was delivered to a cohort of allied health students undertaking their first year of their program. This study assessed how this type of learning was received by students (from the same program) undertaking the same course in an on-campus F2F delivery. Students completed surveys relating to their experiences in learning activities applied in: lectures, tutorials and practicums. In addition, academic outcomes (theoretical and practical) across the two modalities were also evaluated. Overall, students undertaking the mixed-mode delivery performed significantly better in theoretical assessments, while performance in practical assessments was comparable between both deliveries. Student preferences to learning and teaching activities was mixed, however all students highly valued the use of “mini-quizzes” in lectures, tutorials and practicums.Wendt, L.; Du Toit, E.; Naug, H. (2021). ‘Face-to Face vs. Flipped’: A Comparative Study on Academic Outcomes and Learning Preferences in First Year Allied Health Students Undertaking Anatomy and Physiology. En 7th International Conference on Higher Education Advances (HEAd'21). Editorial Universitat Politècnica de València. 1043-1052. https://doi.org/10.4995/HEAd21.2021.13017OCS1043105

Import price formation and pricing to market: A test on Norwegian data

This paper investigates the determinants of Norwegian import prices of manufactures over the period 1970(1) - 1991(4). Multivariate cointegration analysis establishes a long-run relationship between import prices, foreign prices, the exchange rate and domestic unit labour costs. Normalized on import prices, the long-run elasticities are 0.63 (foreign prices and the exchange rate) and 0.37 (domestic costs). Deviations from this relationship are highly significant in a structural import price equation, which also contains positive effects of growth in domestic demand and inflation, as well as a negative effect from the Norwegian unemployment rate. The estimated parameters appear reasonably stable within the sample. Keywords: Import price formation, pricing to market, domestic effects, Johansen procedure, structural error correction model, super exogeneit

Larvae act as a transient transmission hub for the prevalent bumblebee parasite Crithidia bombi

Disease transmission networks are key for understanding parasite epidemiology. Within the social insects, structured contact networks have been suggested to limit the spread of diseases to vulnerable members of their society, such as the queen or brood. However, even these complex social structures do not provide complete protection, as some diseases, which are transmitted by workers during brood care, can still infect the brood. Given the high rate of feeding interactions that occur in a social insect colony, larvae may act as disease transmission hubs. Here we use the bumblebee Bombus terrestris and its parasite Crithidia bombi to determine the role of brood in bumblebee disease transmission networks. Larvae that were artificially inoculated with C. bombi showed no signs of infection seven days after inoculation. However, larvae that received either an artificial inoculation or a contaminated feed from brood-caring workers were able to transmit the parasite to naive workers. These results suggest that the developing brood is a potential route of intracolonial disease transmission and should be included when considering social insect disease transmission networks

Occupational health and metabolic risk factors: A pilot intervention for transport workers

Objectives: Heavy vehicle transport workers have a high risk of obesity and obesity-related disorders including cardiovascular disease and diabetes. Sedentary nature of their work makes a healthy work and lifestyle balance difficult to achieve. Educational interventions that promote behavioral changes have been shown to be effective in various group settings. The aims of this study were to determine the prevalence of metabolic risk factors among a population of urban bus drivers; to deliver a 3-month educational intervention specifically tailored for the workplace environment of transport workers; and to evaluate the efficacy of the intervention through quantitative measurements and qualitative feedback. Material and Methods: Thirty-three bus drivers from depots in south Queensland were recruited for the study. Baseline metabolic data were collected through anthropometric measurements, blood collection and diet/lifestyle questionnaires. Metabolic risk factors that were analyzed included: waist circumference, blood pressure, fasting glucose, blood triglycerides and high density lipoprotein cholesterol (HDL-C). Three interactive seminars were delivered over a 3-month period. At the end of the period, data collection was repeated. Results: At the commencement of the study, 35% of the participants exhibited ≥ 3 of the metabolic risk factors that characterize metabolic syndrome. This is higher than the reported prevalence in the general Australian population (22.1%). A total 21 of the 33 participants remained committed to the intervention and provided pre and post intervention data. Of these, 28% (N = 6) showed a decrease in one or more of the risk factors associated with metabolic syndrome. There was a significant increase in the average HDL-C after the intervention. Qualitative feedback indicated that the workers benefited from the program, especially regarding their awareness of the risks associated with their profession. Conclusions: This pilot study demonstrates that lifestyle education seminars specifically tailored for the workplace can have an impact on the health behaviors of transport workers

Time-Ordered Networks Reveal Limitations to Information Flow in Ant Colonies

BACKGROUND: An important function of many complex networks is to inhibit or promote the transmission of disease, resources, or information between individuals. However, little is known about how the temporal dynamics of individual-level interactions affect these networks and constrain their function. Ant colonies are a model comparative system for understanding general principles linking individual-level interactions to network-level functions because interactions among individuals enable integration of multiple sources of information to collectively make decisions, and allocate tasks and resources. METHODOLOGY/FINDINGS: Here we show how the temporal and spatial dynamics of such individual interactions provide upper bounds to rates of colony-level information flow in the ant Temnothorax rugatulus. We develop a general framework for analyzing dynamic networks and a mathematical model that predicts how information flow scales with individual mobility and group size. CONCLUSIONS/SIGNIFICANCE: Using thousands of time-stamped interactions between uniquely marked ants in four colonies of a range of sizes, we demonstrate that observed maximum rates of information flow are always slower than predicted, and are constrained by regulation of individual mobility and contact rate. By accounting for the ordering and timing of interactions, we can resolve important difficulties with network sampling frequency and duration, enabling a broader understanding of interaction network functioning across systems and scales

Interactions between Nosema microspores and a neonicotinoid weaken honeybees (Apis mellifera)

Global pollinators, like honeybees, are declining in abundance and diversity, which can adversely affect natural ecosystems and agriculture. Therefore, we tested the current hypotheses describing honeybee losses as a multifactorial syndrome, by investigating integrative effects of an infectious organism and an insecticide on honeybee health. We demonstrated that the interaction between the microsporidia Nosema and a neonicotinoid (imidacloprid) significantly weakened honeybees. In the short term, the combination of both agents caused the highest individual mortality rates and energetic stress. By quantifying the strength of immunity at both the individual and social levels, we showed that neither the haemocyte number nor the phenoloxidase activity of individuals was affected by the different treatments. However, the activity of glucose oxidase, enabling bees to sterilize colony and brood food, was significantly decreased only by the combination of both factors compared with control, Nosema or imidacloprid groups, suggesting a synergistic interaction and in the long term a higher susceptibility of the colony to pathogens. This provides the first evidences that interaction between an infectious organism and a chemical can also threaten pollinators, interactions that are widely used to eliminate insect pests in integrative pest management