Although evolutionary change within most species is thought to occur slowly, recent studies have identified cases where evolutionary change has apparently occurred over a few generations. Anthropogenically altered environments appear particularly open to rapid evolutionary change over comparatively short time scales. Here, we consider a Pacific salmon population that may have experienced life-h...

The paper explores migrant workers careers in the health sector, comparing the Spanish case and the British case. International migration has become an important feature of globalized labour markets in health care. Recently, concerns over the need of ensuring staff and skill shortages in the health system are becoming a common issue in many European countries. Following this, the paper is focus...

New tools of genomic analysis shed light on historical puzzles. Migrations of ancient peoples, differences in migration patterns of males and females, historical demography of cultures with ancient roots, and patterns of human genetic diversity are increasingly the focus of integrated analysis by historians, anthropologists, and geneticists.

Given the geography and agroclimatic conditions of the Southeast, coupled with continued population expansion from in-migration, local foods markets may be a promising niche market for some farms in the region. The Southeast has more small farms than any other U.S. region. Using farm-level data, we address the question of how successful southeastern farms engaged in direct sales to consumers di...

Why is there such wide-spread opposition to immigration, although attitudes are generally favorable towards trade? Using concepts from population ethics, this paper shows that impartial observers oppose unskilled immigration if they are inequality-averse, base their decisions on national interest, and have an integrative view of immigration. Moreover, unskilled immigration makes redistribution ...

Constant immigration can stabilize population size fluctuations but its effects on extinction remain unexplored. We show that constant immigration significantly reduced extinction in fruitfly populations with relatively stable or unstable dynamics. In unstable populations with oscillations of amplitude around 1.5 times the mean population size, persistence and constancy were unrelated. Low immi...

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...

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...

The paper analyses the welfare effects of immigration when some sectors of the economy are characterized by wage bargaining between unions and employers. We show that immigration is unambiguously beneficial if the wage elasticity of labor demand in the competitive sectors is smaller than in the unionised sectors. In the opposite case, the welfare effect of immigration is ambiguous; little immig...

This paper examines the relationship between unemployment and immigration in Canada. The bidirectional causality test finds no evidence of a significant effect of Canadian immigration on unemployment. Cointegration tests indicate that there is no observed increase in aggregate unemployment due to immigration in the long run. The results from the causality test based on the vector error correcti...