An aim of community ecology is to understand the patterns of competing species assembly along environmental gradients. All species interact with their environments. However, theories of community assembly have seldom taken into account the effects of species that are able to engineer the environment. In this modeling study, we integrate the species' engineering trait together with processes of ...

How many "American jobs" have U.S.-born workers lost due to immigration and offshoring? Or, alternatively, is it possible that immigration and offshoring, by promoting cost-savings and enhanced efficiency in firms, have spurred the creation of jobs for U.S. natives? We consider a multi-sector version of the Grossman and Rossi-Hansberg (2008) model with a continuum of tasks in each sector and we...

How do political systems shape immigration policy-making? Explicitly or implicitly, comparative politics and migration policy theories suggest a 'regime effect' that links specific dynamics of immigration policy to liberal democracy. The literature's dominant focus on so-called 'Western liberal democracies', however, has left the 'regime effect' largely untested and research on variations and s...

Since 2005, state legislatures have passed hundreds of immigration bills, and state officials have argued that their efforts attempt to solve immigration crises caused by federal inaction. The state–federal clash over immigration seems to confirm scholarship suggesting deepening lines of conflict in the federal system since the 1990s. The question remains, however, whether this explosion in sta...

This study assessed the contribution of immigration and deprivation to the changes in tuberculosis notifications in Liverpool over the last 20 yrs. Ethnic origin was retrospectively assigned to all named cases from 1974 to 1995. Average tuberculosis rates were calculated for the 33 council wards in Liverpool for 1981-1985 and 1991-1995. Multiple regression was used to determine the independent ...

We offer an empirical, econometric analysis of the impact of migration on the EU 27's NUTS-2 regions in the period 2000-2007. While our results indicate that migration had no statistical impact on regional unemployment in the EU it had a significant impact on both per-capita GDP and productivity. The coefficients suggest that a 1 percent increase in immigration to immigration regions increased ...

The large influx of immigrants in recent decades has led to an equally long, still unresolved debate over its effect on the economic well-being of native-born workers. Specifically, does immigration impose costs on U.S. workers by diminishing their labor market prospects? Economic theory posits that an increase in the supply of labor, such as through immigration, will reduce the wages and emplo...

We investigate how demand for both the financing and provision of redistributive policies is affected by information about immigration poverty. Information has a positive impact on desired tax progressivity among low-income respondents negative one higher income earners. poverty no impact. On side, middle- high-income increase public education expenditure in response to poverty, while reduce sp...

Immigration is a hotly-debated topic in many countries around the world. We examine how immigration-related political elite discourses affect natives’ attitudes towards immigration and these contribute to polarisation along socio-economic dimensions. Drawing upon longitudinal cross-national data from European Social Survey over 18 years genuine within-country estimator for both country-level ma...

The United Kingdom's political, economic, and social challenges have been greatly impacted by the Brexit referendum (UK). problem of immigration to UK is also among most significant Brexit-related challenges. issue illegal will be main subject this study. This study's goal analyse effects that an impact on prevention unauthorized into UK. government's decision announce new regulations as one it...