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This article juxtaposes theoretical notions concerning the relationship between migrant remittances and socio-economic inequality with an anthropological case study of remittances in Cape Verde. Contemporary theorizing involves, firstly, the idea that remittances do not benefit the poorest; secondly, the conclusion that the impact of remittances changes over time; thirdly, the notion that family structure influences the distribution of remittances; and fourthly the proposition that remittances have a stronger impact on social stratification when linked to the return of a migrant. The primary aim of the article is to use these theoretical notions as entry-points for analysing how remittances interplay with patterns of inequality in Cape Verde. A second aim is to examine the explanatory power of the theories through applying them to this specific case. The article demonstrates that remittances in some cases benefit the poorest in Cape Verde and that this has to do with the long history of migration, which means that nearly everyone, irrespective of class, has a close relative abroad. It also shows that Cape Verdeans generally receive quite small amounts of money, which implies that they are seldom able to improve their economic situation in a more substantial way. In conclusion, the article contends that in order to fully appreciate the complex relationship between remittances and socio-economic inequality it is necessary to take into account the importance of other sources of income. Moreover, it argues that the contemporary restrictive immigration regimes in receiving countries have a fundamental impact on the socio-economic distribution of remittances. In studies of the relationship between remittances and inequality, this is an aspect that has been left out. Instead, theorizing tends to focus on factors that are internal to the countries of origin, and on the migrants' links to these countries. [ABSTRACT FROM AUTHOR]

The tracking of small avian migrants has only recently become possible by the use of small light-level geolocators, allowing the reconstruction of whole migration routes, as well as timing and speed of migration and identification of wintering areas. Such information is crucial for evaluating theories about migration strategies and pinpointing critical areas for migrants of potential conservation value. Here we report data about migration in the common swift, a highly aerial and long-distance migrating species for which only limited information based on ringing recoveries about migration routes and wintering areas is available. Six individuals were successfully tracked throughout a complete migration cycle from Sweden to Africa and back. The autumn migration followed a similar route in all individuals, with an initial southward movement through Europe followed by a more southwest-bound course through Western Sahara to Sub-Saharan stopovers, before a southeastward approach to the final wintering areas in the Congo basin. After approximately six months at wintering sites, which shifted in three of the individuals, spring migration commenced in late April towards a restricted stopover area in West Africa in all but one individual that migrated directly towards north from the wintering area. The first part of spring migration involved a crossing of the Gulf of Guinea in those individuals that visited West Africa. Spring migration was generally wind assisted within Africa, while through Europe variable or head winds were encountered. The average detour at about 50% could be explained by the existence of key feeding sites and wind patterns. The common swift adopts a mixed fly-and-forage strategy, facilitated by its favourable aerodynamic design allowing for efficient use of fuel. This strategy allowed swifts to reach average migration speeds well above 300 km/day in spring, which is higher than possible for similar sized passerines. This study demonstrates that new technology may drastically change our views about migration routes and strategies in small birds, as well as showing the unexpected use of very limited geographical areas during migration that may have important consequences for conservation strategies for migrants. [ABSTRACT FROM AUTHOR]

Long-range, seasonal migration is a widespread phenomenon among insects, allowing them to track and exploit abundant but ephemeral resources over vast geographical areas. However, the basic patterns of how species shift across multiple locations and seasons are unknown in most cases, even though migrant species comprise an important component of the temperate-zone biota. The painted lady butterfly Vanessa cardui is such an example; a cosmopolitan continuously-brooded species which migrates each year between Africa and Europe, sometimes in enormous numbers. The migration of 2009 was one of the most impressive recorded, and thousands of observations were collected through citizen science programmes and systematic entomological surveys, such as high altitude insect-monitoring radar and ground-based butterfly monitoring schemes. Here we use V. cardui as a model species to better understand insect migration in the Western Palaearctic, and we capitalise on the complementary data sources available for this iconic butterfly. The migratory cycle in this species involves six generations, encompassing a latitudinal shift of thousands of kilometres (up to 60 degrees of latitude). The cycle comprises an annual poleward advance of the populations in spring followed by an equatorward return movement in autumn, with returning individuals potentially flying thousands of kilometres. We show that many long-distance migrants take advantage of favourable winds, moving downwind at high elevation (from some tens of metres from the ground to altitudes over 1000 m), pointing at strong similarities in the flight strategies used by V. cardui and other migrant Lepidoptera. Our results reveal the highly successful strategy that has evolved in these insects, and provide a useful framework for a better understanding of long-distance seasonal migration in the temperate regions worldwide. [ABSTRACT FROM AUTHOR]

We conducted stable isotope analyses of nitrogen and carbon on feathers obtained from willow warblers in Africa to find an explanation for a previously observed pattern of different δ15N and δ13C values across a migratory divide in central Scandinavia. A new data set confirms that north Scandinavian birds of the subspecies P. t. acredula have higher δ15N values than south Scandinavian birds of the subspecies P. t. trochilus. In Africa, we found significant differences for both δ15N and δ13C values among feathers collected from major geographical regions as well as between countries within regions. Isotope signatures of δ15N and δ13C in Scandinavian acredula matched well with those of willow warblers sampled in southern parts of Africa, but differed from samples obtained in East and West Africa. Isotope signatures in Scandinavian trochilus did not agree with the pattern in any of the three African regions (West, East or South). However, a more detailed analysis of the isotopic data in feathers from countries within West Africa, which is the wintering region of Swedish trochilus based on ringing recoveries, revealed a correspondence with samples from Liberia, the Ivory Coast and Nigeria. [ABSTRACT FROM AUTHOR]