71 research outputs found

    Thermal Tolerance of the Coffee Berry Borer Hypothenemus hampei: Predictions of Climate Change Impact on a Tropical Insect Pest

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    Coffee is predicted to be severely affected by climate change. We determined the thermal tolerance of the coffee berry borer , Hypothenemus hampei, the most devastating pest of coffee worldwide, and make inferences on the possible effects of climate change using climatic data from Colombia, Kenya, Tanzania, and Ethiopia. For this, the effect of eight temperature regimes (15, 20, 23, 25, 27, 30, 33 and 35°C) on the bionomics of H. hampei was studied. Successful egg to adult development occurred between 20–30°C. Using linear regression and a modified Logan model, the lower and upper thresholds for development were estimated at 14.9 and 32°C, respectively. In Kenya and Colombia, the number of pest generations per year was considerably and positively correlated with the warming tolerance. Analysing 32 years of climatic data from Jimma (Ethiopia) revealed that before 1984 it was too cold for H. hampei to complete even one generation per year, but thereafter, because of rising temperatures in the area, 1–2 generations per year/coffee season could be completed. Calculated data on warming tolerance and thermal safety margins of H. hampei for the three East African locations showed considerably high variability compared to the Colombian site. The model indicates that for every 1°C rise in thermal optimum (Topt.), the maximum intrinsic rate of increase (rmax) will increase by an average of 8.5%. The effects of climate change on the further range of H. hampei distribution and possible adaption strategies are discussed. Abstracts in Spanish and French are provided as supplementary material Abstract S1 and Abstract S2

    An unlikely partnership: fishers’ participation in a small-scale fishery data collection program in the Timor Sea

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    Traditional fisheries stock assessment methods and fishery independent surveys are costly and time consuming exercises. However fishers trained in data collection and utilising other skills can reduce costs and improve fishery assessments and management. A data collection program was conducted by Australian and Indonesian scientists with small-scale Indonesian sea cucumber fishers to evaluate the approach and then capture its benefits. The data fishers recorded allowed for the first stock assessment of this trans-boundary fishery during its centuries-long existence at Scott Reef in north-western Australia. The program also included interviews with fishers capturing the social, economic, and demographic aspects of the fishery. Economic inputs to fishing were complemented by fishery revenue data voluntarily submitted when fishers returned to port and sold their catch. Catch data recorded by fishers demonstrated much higher abundances than estimates obtained using standard visual transect methods and accurately reflected the true catch composition. However, they also showed extreme rates of exploitation. Interviews revealed social and economic factors that would be important considerations if management interventions were made. The program’s approach and the time scientists spent on the fishers’ vessels were key ingredients to fishers’ participation and the utility of the results. Despite the program’s achievements the information generated has not led to improved management or had any direct benefits for the participants. Sustaining the program in the longer term requires that its value is better captured

    Student Engagement in Online Learning

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    Preliminary findings of the survey indicate that Weblearn is viewed positively by students, with both beginners and post-beginners welcoming this provision and in particular the integration between taught contents and learning materials available on Weblearn. However, although students displayed a great deal of confidence in their ability to use Weblearn, they also expressed the desire to be guided by their lecturers, in order to boost their experience on the VLE. In this context, the lecturer’s role of facilitator regarding language learning also embraces e-learning. Such findings promote the notion that it is essential for lecturers to fully integrate socio-constructivist practices and redefine their role to adapt to ever-changing practices

    Virtual learning environments and world languages: the way forward

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    Modern foreign languages, higher education and mobile learning

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    A review of literature on Modern Foreign Languages and mobile learning at Higher Education Institutions in the United Kingdom, with a particular focus on the importance of the context on students’ learning experience Modern Foreign Language departments at Higher Education Institutions in the United Kingdom are considered to be in a precarious situation, with declining enrolments on specialist language degree courses, in a context of an ever-increasing diversification of the student population. At the same time, many universities have launched programmes and developed strategies to expand the use of e-learning and mobile learning within their departments with a view to maximise students’ learning experience. This paper will define mobile learning in the context of Modern Foreign Languages and will consider the importance of the learning context, based on theories of collaborative learning. This article was added to our website on 10/08/10 at which time all links were checked. However, we cannot guarantee that the links are still valid

    A week in the life of … Nathalie Ticheler, London Metropolitan University

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