Phylogeographic analysis of barley DNA as evidence for the spread of Neolithic agriculture through Europe

Results of analyses of the photoperiod response gene (PPD-H1) and simple sequence repeats (SSRs) in modern landraces of cultivated barley were used as evidence for the mechanism of agricultural spread in Neolithic Europe. In particular, we explored the usefulness of considering adaptive genes as indicators of past selective pressures acting on crops, during their spread through Europe. In some areas, such as the Alpine region, Britain and Scandinavia, we have evidence to suggest that the adaptation of crops to certain climatic conditions may have contributed to the timing of agricultural spread. At the northern fringes of Europe, and in higher altitude locations in central Europe, the introduction of more suitably adapted cereals may have facilitated successful agriculture to trigger agricultural expansion. This research opens up the possibility of investigating other genetic adaptations to climate, which would permit a fuller evaluation of the relative contributions of climate/crop and forager/farmer interactions in the process of agricultural spread.     

INTRODUCTION: PROCESSES OF CHANGE IN URBAN SYSTEMS*

ABSTRACT The twenty‐first century will be one of intensified urbanization, on a scale never before experienced. How do urban systems and individual cities change and develop? The social sciences have many different approaches to analyzing the economic, social, and spatial dimensions of urban change. We inventory some of these approaches and their implications for public policy toward cities, urban change, and economic development.     

Development and the environment: Perception and opinion in St Andrews,Scotland

In 2003, three proposals were being mediated through the planning system in the peri‐urban environment of St Andrews, Fife: a large housing development, a rail link, and a Green Belt. Using questionnaires and semi‐structured interviews with key stakeholders, we investigate the ways in which diverse conceptions of ‘the environment’ shaped public reactions to these proposals, and evaluate the fit between these and the respondents’ stated environmental perceptions. 98% of local residents surveyed describe themselves as ‘concerned about the environment’. However, large majorities conceive of the environment as a local rather than a global phenomenon, and regard it primarily in terms of personal benefits (such as landscape aesthetics or traffic considerations). By exploring the environmental perceptions in the light of the planning proposals, the study supports the contention that the ‘local environment’ is a socially constructed phenomenon which can be fashioned and re‐fashioned according to local perceptions of threats and opportunities.