2 resultados para EXTRAPOLATION

em Research Open Access Repository of the University of East London.


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Land-use change and intensification threaten bee populations worldwide, imperilling pollination services. Global models are needed to better characterise, project, and mitigate bees' responses to these human impacts. The available data are, however, geographically and taxonomically unrepresentative; most data are from North America and Western Europe, overrepresenting bumblebees and raising concerns that model results may not be generalizable to other regions and taxa. To assess whether the geographic and taxonomic biases of data could undermine effectiveness of models for conservation policy, we have collated from the published literature a global dataset of bee diversity at sites facing land-use change and intensification, and assess whether bee responses to these pressures vary across 11 regions (Western, Northern, Eastern and Southern Europe; North, Central and South America; Australia and New Zealand; South East Asia; Middle and Southern Africa) and between bumblebees and other bees. Our analyses highlight strong regionally-based responses of total abundance, species richness and Simpson's diversity to land use, caused by variation in the sensitivity of species and potentially in the nature of threats. These results suggest that global extrapolation of models based on geographically and taxonomically restricted data may underestimate the true uncertainty, increasing the risk of ecological surprises.

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Philip Pullman, author of the His Dark Materials trilogy, has acquired an impressive critical reputation and acquired a favored role in British culture as a social commentator. This essay attempts to link the pleasures associated with the trilogy with the politics inscribed in them, and consider both in the context of Pullman’s role in the civil society. The essay suggests that The Northern Lights offers pleasures in fantastical and metaphysical possibilities, and social confederacies that potentially offset the affective privations of neoliberalism. These possibilities are set in the context of recent theories of the “enterprise society.” The essay draws attention to a number of discontinuities that unfold as the trilogy progresses, and suggests that these undermine the possibilities inherent in the first novel. These disconti - nuities throw the role of fantasy and alternative universes into question, and reveal the limitations of Pullman’s fiction. The essay considers the limit and scope of Pullman’s political vision, both as a function of his fiction and his public engagement with social issues, and suggests that he exemplifies Raymond Williams’s concept of “bourgeois dissent” in which political critique and a continuing investment in traditional institutions and class hierarchy can be mutually reinforcing.