Cattle Raising on the Plains


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Decisions of the Commission


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Drones for Biodiversity Conservation and Ecological Monitoring


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Unmanned aerial vehicles (UAV) have already become an affordable and cost-efficient tool to quickly map a targeted area for many emerging applications in the arena of ecological monitoring and biodiversity conservation. Managers, owners, companies, and scientists are using professional drones equipped with high-resolution visible, multispectral, or thermal cameras to assess the state of ecosystems, the effect of disturbances, or the dynamics and changes within biological communities inter alia. We are now at a tipping point on the use of drones for these type of applications over natural areas. UAV missions are increasing but most of them are testing applicability. It is time now to move to frequent revisiting missions, aiding in the retrieval of important biophysical parameters in ecosystems or mapping species distributions. This Special Issue shows UAV applications contributing to a better understanding of biodiversity and ecosystem status, threats, changes, and trends. It documents the enhancement of knowledge in ecological integrity parameters mapping, long-term ecological monitoring based on drones, mapping of alien species spread and distribution, upscaling ecological variables from drone to satellite images: methods and approaches, rapid risk and disturbance assessment using drones, mapping albedo with UAVs, wildlife tracking, bird colony and chimpanzee nest mapping, habitat mapping and monitoring, and a review on drones for conservation in protected areas.







Public general laws


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The Postal Record


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The Legacies of Richard Popkin


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Richard H. Popkin (1923-2005) transformed the study of the history of philosophy in the second half of the twentieth century. His History of Scepticism and his many other publications demonstrated the centrality of the problem of skepticism in the development of modern thought, the intimate connections between philosophy and religion, and the importance of contacts between Jewish and Christian thinkers. In this volume, scholars from around the world assess Popkin’s contributions to the many fields in which he was interested. The Legacies of Richard Popkin provides a broad overview of Popkin’s work and demonstrates the connections between the many topics he wrote about. A concluding article, by Popkin’s son Jeremy Popkin, draws on private letters to provide a picture of Popkin’s life and career in his own words, revealing the richness of the documents now accessible to scholars in the Richard Popkin papers at the William Andrews Clark Library in Los Angeles.