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Labour market shortages, structural problems and unfavourable demographics have all prompted governments to act, often by focusing on high-skilled immigration. However, policy responses have been very different. Some countries were able to adopt quite open high-skilled immigration policies, while others did not. This article provides a political economy explanation for this. It argues that, despite similar pressures, high-skilled immigration policy outputs vary due to shifting coalitions between disaggregated sectors of native high-skilled, low-skilled labour and capital. To probe this argument, the article examines coalitions in four countries (France, Germany, Sweden and the United Kingdom) from the late 1990s to present, and draws on original interviews with policy-makers, unions and employers' associations; official documents and the literature on immigration, political economy and public policy. The varying labour market organization of actors informs differences in coalitions which in turn has resulted in different high-skilled immigration policy outputs, cross-nationally and over time.

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Mycorrhizal fungi provide direct and functional interconnection of soil environment with their host plant roots. Colonization of non-host plants have occasionally been described, but its intensity and functional significance in complex plant communities remain generally unknown. Here, the abundance of ectomycorrhizal fungus Tuber aestivum was measured in the roots of host and non-host (non-ectomycorrhizal) plants in a naturally occurring T. aestivum colony using a quantitative PCR approach. The roots of non-host plant species found inside the brûlé area were extensively colonized by T. aestivum mycelium, although the levels were significantly lower than those found in host Carpinus betulus roots. However, fungal biomass concentration in the non-host roots was one to two orders of magnitude higher than that in the surrounding soil. This indicates existence of an important biotic interaction between T. aestivum mycelium and the non-host, mostly herbaceous plants. Roots, either host or non-host, thus probably constitute hot spots of T. aestivum activity in the soil ecosystem with as yet uncovered functional significance.