Do Rainfall Deficits Predict U.S.-Bound Migration from Rural Mexico? Evidence from the Mexican Census

Environmental and climatic changes have shaped human mobility for thousands of years and research on the migration-environment connection has proliferated in the past several years. Even so, little work has focused on Latin America or on international movement. Given rural Mexico’s dependency on primary sector activities involving various natural resources, and the existence of well-established transnational migrant networks, we investigate the association between rainfall patterns and U.S.-bound migration from rural locales, a topic of increasing policy relevance. The new economics of labor migration theory provides background, positing that migration represents a household-level risk management strategy. We use data from the year 2000 Mexican census for rural localities and socioeconomic and state-level precipitation data provided by the Mexican National Institute for Statistics and Geography. Multilevel models assess the impact of rainfall change on household-level international out-migration while controlling for relevant sociodemographic and economic factors. A decrease in precipitation is significantly associated with U.S.-bound migration, but only for dry Mexican states. This finding suggests that programs and policies aimed at reducing Mexico-U.S. migration should seek to diminish the climate/weather vulnerability of rural Mexican households, for example by supporting sustainable irrigation systems and subsidizing drought-resistant crops.     

The impact of origin community characteristics on rural-urban out-migration in a developing country

It is widely believed that structural variables such as inequitable land distribution, lack of rural employment opportunities, and rural-urban wage and amenity gaps influence population movements in developing countries. Yet quantitative evidence is scant. In this paper a multilevel model is used to investigate the effects of individual-, household-, and areal-level factors on rural-urban out-migration in the Ecuadorian Sierra. Data from a detailed survey carried out in 1977-1978 and from government macro-areal statistics are used to investigate factors affecting the out-migration of youths aged 12-25. Preliminary conclusions are presented on the usefulness of multilevel models in studying migration and policy implications for Ecuador.     

Rural out-migration and resource-dependent communities in Mexico and India

Resource regimes are complex social–ecological systems that operate at multiple levels. Using data from two distinct cultural and environmental contexts (Mexico and India), this paper looks at the susceptibility and response of such regimes to rural out-migration. As a driver of demographic and cultural change, out-migration impacts both the practices and institutional arrangements that define territorial resource use and management. The research shows that critical yet poorly recognised shifts in migration dynamics can increase the pressures felt locally and serve to reduce the effectiveness of institutional adaptations at the community level. From an environmental perspective, the research adds to the body of work examining the impacts of rural depopulation on land and seascapes and associated biological diversity. We question the assumption that rural–urban migration necessarily simulates ecosystem recovery and aids conservation. This finding is timely as funding agencies and government programs show belated interest in the consequences of out-migration for environmental management, resource use and rural livelihoods in tropical country settings.     

中国城乡人口迁移数量决定因素的实证研究:1992~2004

通过对影响中国城乡迁移的因素进行实证分析,得到如下结论:第一,中国的经济增长对城乡迁移具有比较明显地促进作用;第二,人均耕地面积的减少成为城乡迁移比较重要的推动力量;第三,中国城镇新增就业岗位对城乡迁移具有显著的正向影响,中国城镇失业率对城乡迁移的影响不显著,中国的城乡迁移仍存在盲目性;第四,中国城乡收入差距对城乡迁移的作用不显著。     

Temporal and spatial variation in age-specific net migration in the United States

As fertility differences in the United States diminish, population redistribution trends are increasingly dependent on migration. This research used newly developed county-level age-specific net migration estimates for the 1990s, supplemented with longitudinal age-specific migration data spanning the prior 40 years, to ascertain whether there are clear longitudinal trends in age-specific net migration and to determine if there is spatial clustering in the migration patterns. The analysis confirmed the continuation into the 1990s of distinct net migration "signature patterns" for most types of counties, although there was temporal variation in the overall volume of migration across the five decades. A spatial autocorrelation analysis revealed large, geographically contiguous regions of net in-migration (in particular, Florida and the Southwest) and geographically contiguous regions of net out-migration (the Great Plains, in particular) that persisted over time. Yet the patterns of spatial concentration and fragmentation over time in these migration data demonstrate the relevance of this "neighborhood" approach to understanding spatiotemporal change in migration.     

Climate shocks and migration: an agent-based modeling approach

This is a study of migration responses to climate shocks. We construct an agent-based model that incorporates dynamic linkages between demographic behaviors, such as migration, marriage, and births, and agriculture and land use, which depend on rainfall patterns. The rules and parameterization of our model are empirically derived from qualitative and quantitative analyses of a well-studied demographic field site, Nang Rong district, northeast Thailand. With this model, we simulate patterns of migration under four weather regimes in a rice economy: (1) a reference, “normal” scenario; (2) 7 years of unusually wet weather; (3) 7 years of unusually dry weather; and (4) 7 years of extremely variable weather. Results show relatively small impacts on migration. Experiments with the model show that existing high migration rates and strong selection factors, which are unaffected by climate change, are likely responsible for the weak migration response.     

Rural-Urban Migration and Reproductive Behavior in Guatemala

Guatemala has the highest fertility of any country in Latin America, and it is also the least urbanized. Projected rural-urban migration will shift more of Guatemala's population from rural areas into towns and cities. This article uses retrospective life-history data collected in migrant origin and destination areas in Guatemala to compare the fertility of rural-urban migrant women to that of rural and urban nonmigrants. Results from discrete-time hazard regression models of union formation, first birth, and third and higher parity births indicate that delayed marriage while still in rural areas, and the rapid adoption of urban fertility practices after migration, result in intermediate migrant fertility that is closer to that of urban natives than rural nonmigrants. If current patterns are any guide to the future, the redistribution of population from high fertility rural areas to towns and cities in Guatemala will accelerate the decline in aggregate fertility beyond what would have resulted from declines in rural and urban fertility alone.     

Determinants of out-migration in rural China: effects of payments for ecosystem services

Rural-to-urban migration has been a hallmark of economic development in China and other developing countries and can have profound socio-economic and ecological implications. This study seeks to understand the impacts on this migration of two large payments for ecosystem services (PES) programs implemented by the Chinese Government: the Conversion of Cropland to Forest Program (CCFP) and the Ecological Welfare Forest Program (EWFP). The primary goal of these PES programs is environmental conservation with poverty alleviation as the secondary goal. We use a full model of the factors affecting rural out-migration at the individual, household, and community levels to investigate how these PES programs have influenced out-migration in a mountainous rural area of Anhui, China. Results show that the CCFP facilitates out-migration, while the EWFP overall discourages it, thereby somewhat offsetting the effects of the CCFP. Out-migration is also shown to be affected by a number of other individual, household, and community characteristics. The results are useful for designing concurrent PES programs in the future aiming at both environmental conservation and livelihood improvement in not only China but also other developing countries.     

Urbanization and the fertility transition in Ghana

This paper examines the way in which migration and urban residence operate to alter fertility outcomes. While urban-rural fertility differentials have long been established for most developing societies, the nature of these differences among migrants and between migrants and those of succeeding generations is not well understood. The evidence presented here suggests that rural-urban migration and urbanization may contribute positively to processes of fertility transition. Using data from the 1998 Kumasi Peri-Urban Survey, which included a 5-year retrospective monthly calendar of childbearing, we suggest that migrants adapt quickly to an urban environment. Our results also reveal generational differences in recent and cumulative fertility. While migrants exhibit higher cumulative fertility than urban residents of the second and third generation, their fertility is significantly lower than rural averages in Ghana. Children of migrants exhibit childbearing patterns quite similar to those in higher-order generations. Most noteworthy is the nature of the disparities in childbearing patterns between migrants and the succeeding generations. Migrant women have higher lifetime fertility than urban natives. Migrant women also exhibit higher fertility over the last 5 years than second generation or high-order urban natives. But these first generation women exhibit lower fertility (vs. urban natives) for the year immediately prior to the survey. These patterns lend support to an interpretation that combines rather than opposes theories of selectivity, disruption, adaptation and socialization. We conclude by discussing mechanisms that might explain these interrelated processes of fertility adjustment and suggest that policies discouraging rural-urban migration need to be revisited.     

Recovery migration to the City of New Orleans after Hurricane Katrina: a migration systems approach

Hurricane Katrina’s effect on the population of the City of New Orleans provides a model of how severe weather events, which are likely to increase in frequency and strength as the climate warms, might affect other large coastal cities. Our research focuses on changes in the migration system—defined as the system of ties between Orleans Parish and all other U.S. counties—between the pre-disaster (1999–2004) and recovery (2007–2009) periods. Using Internal Revenue Service county-to-county migration flow data, we find that in the recovery period, Orleans Parish increased the number of migration ties with and received larger migration flows from nearby counties in the Gulf of Mexico coastal region, thereby spatially concentrating and intensifying the in-migration dimension of this predominantly urban system, while the out-migration dimension contracted and had smaller flows. We interpret these changes as the migration system relying on its strongest ties to nearby and less-damaged counties to generate recovery in-migration.     

Out-migration and land-use change in agricultural frontiers: insights from Altamira settlement project

One of Daniel Hogan??s lasting impacts on international demography community comes through his advocacy for studying bidirectional relationships between environment and demography, particularly migration. We build on his holistic approach to mobility and examine dynamic changes in land use and migration among small farm families in Altamira, Pará, Brazil. We find that prior area in either pasture or perennials promotes out-migration of adult children, but that out-migration is not directly associated with land-use change. In contrast to early formulations of household life cycle models that argued that aging parents would decrease productive land use as children left the farm, we find no effect of out-migration of adult children on land-use change. Instead, remittances facilitate increases in area in perennials, a slower to pay off investment that requires scarce capital, but in pasture. While remittances are rare, they appear to permit sound investments in the rural milieu and thus to slow rural exodus and the potential consolidation of land into large holdings. We would do well to promote the conditions that allow them to be sent and to be used productively to keep families on the land to avoid the specter of extensive deforestation for pasture followed by land consolidation.     

The Relationship Between Resources and Human Migration Patterns in Central Kamchatka During the Post-Soviet Period

This paper examines the relationship between resources and migration in post-Soviet Kamchatka (Russian Far East). During the post-Soviet period of socio-economic hardship, migration trends have changed drastically both in central Kamchatka and throughout the Russian Far East. I predicted that there would be a clear relationship between resource scarcity and people's decisions to leave in search of more propitious opportunities. Against the backdrop of economic decline, out-migration prevailed in central Kamchatka throughout the post-Soviet period; however, migration patterns among villages in this rural and resource-dependent region diverge considerably. Villages in central Kamchatka facing a local natural resource crisis show greater net negative migration than those with a relatively intact resource base. Such variation is notable, given the relatively contained area of the study; it suggests migration patterns are closely tied to ecological conditions. Besides socio-economic and ecological factors, historical circumstances also influence migration patterns. The decision to migrate is complex, arising from the interaction of socio-economic, political, ecological, and historical conditions.     

Determinants of rural-urban migration in Ghana

Abstract In the 39 years between the 1921 and 1960 censuses, urban population in Ghana multiplied by nine while the population of the whole country only trebled. The major factor in urban growth was rural-urban migration and the reproduction of the migrants. In 1963 a survey consisting of a systematic sample of households in 45 rural centres, randomly chosen in Local Authority Areas selected in accord with the regional rural population distribution, reconstituted the rural population so as to include current migrants in the towns as well as those remaining in rural areas. For analysis 13,748 respondents were divided into 14 categories by ruralurban migration behaviour. At the same time a survey of urban population provided a check on rural-urban migration data. study of the propensity to migrate from rural to urban areas shows that this increases with the closeness of the rural area to a large town, the population size of the rural centre, the economic well-being of the rural household, the number of relatives already in the urban area, the individual's level of education, larger family size and probably lower birth rank, as well as exhibiting specific age and sex patterns. It is shown that only a minor role is played by occupation, conjugal condition and number of dependants. Various interrelations between these factors are discussed, and attention is given to the special importance of education in partially or wholly determining some of the other factors. Census data are used to demonstrate the effect of rural-urban migration in concentrating persons with certain characteristics in the urban areas.     

Networks Versus Need: Drivers of Urban Out-Migration in the Brazilian Amazon

As urbanization rates rise globally, it becomes increasingly important to understand the factors associated with urban out-migration. In this paper, we examine the drivers of urban out-migration among young adults in two medium-sized cities in the Brazilian Amazon—Altamira and Santarém—focusing on the roles of social capital, human capital, and socioeconomic deprivation. Using household survey data from 1,293 individuals in the two cities, we employ an event history model to assess factors associated with migration and a binary logit model to understand factors associated with remitting behavior. We find that in Altamira, migration tends to be an individual-level opportunistic strategy fostered by extra-local family networks, while in Santarém, migration tends to be a household-level strategy driven by socioeconomic deprivation and accompanied by remittances. These results indicate that urban out-migration in Brazil is a diverse social process, and that the relative roles of extra-local networks versus economic need can function quite differently between geographically proximate but historically and socioeconomically distinct cities.     

Fertility adaptation by rural-urban migrants in developing countries: The case of Korea

Summary The purpose of this study is to develop and test a model to assess the influence of rural-urban migration on fertility in less developed countries. Two major reasons may account for lower fertility levels observed among such migrants than among women who remained in rural areas: a selection effect, and adaptation to constraints in the area of destination. Results of previous studies have only rarely suggested that the effect of adaptation was significant. We use the detailed personal migration and pregnancy histories recorded in the Korean World Fertility Survey of 1974 and an autoregressive model to control for unobservable variations in personal preferences for different family sizes between migrants and non-migrants. Our study provides evidence that adaptation following rural-urban migration is a significant factor which explains the lower fertility of rural-urban migrants compared with that of rural stayers.     

The effect of female migration on infant and child survival in Uganda

This article uses data from the 1996 Uganda Demographic and Health Survey to examine whether migration of women improves the survival chances of their children to age five. We expand on prior research by testing not only the hypothesized positive effect of rural-urban migration, but also the effects of other migration stream behaviours on child survival. Results show that up to 10% of children die before age five and within-group differences in mortality exist among urban and rural children depending on their mother's migration status. Only urban-urban migration was significantly related to child survival, compared to rural non-migrants, after controlling for other factors, although other streams of migration (rural-urban, urban-rural, rural-rural) were positively related to child survival. Generally, migration explains a small component of the variance in child survival. Several other factors, including parents' education, household size, household headship, mother's age at birth, duration of breastfeeding, and place of delivery have a significant predictive power on child survival.     

Who moves and who stays? Rural out-migration in Nigeria

Data from the nationally representative 1993 Migration and Urbanization Survey of Nigeria are used to simultaneously examine the patterns of rural-rural and rural-urban migration in Nigeria. A multinomial logistic regression model predicts the independent and collective association between individual, household, and regional variables and migration from rural areas to rural and urban destinations. Associations between education, religion and ethnicity and migration propensities exist at the national level. The Kanuri-Shua Arabs are generally non-migrants, the Hausa-Fulani and Yoruba are predominantly rural-rural migrants and the Igbo-Ibibio and Urhobo-Isoko-Edo are predominantly ruralurban migrants. Christians are significantly more mobile than Muslims. While the highly educated are most likely to choose an urban destination, a significant proportion migrate to other rural areas. Concern over population concentration is not supported, as rural migrants move to all regions and to urban and rural areas.     

中国“乡-城”人口迁移规模的测算与分析（1979-2003）

改革开放以后,中国每年到底有多少农村人口迁移城镇成为城镇常住人口,一直是个未知的谜。本文借助现有的统计资料对历年中国“乡-城”人口迁移的具体规模进行了测算,总结了改革开放以来中国“乡-城”人口迁移的变动规律。     

Internal and International Migration Across the Urban Hierarchy in Albania

The interactions between the processes of urbanization and international migration in less developed and transition countries have important repercussions for socioeconomic development, but are not well understood. Based on the retrospective data from the Albanian Living Standards Measurement Survey 2008, we first assess the geography of migration in terms of the rural–urban continuum, the urban hierarchy and the outside world since 1990. We then investigate the spatio-temporal diffusion of rural-to-urban and international movements using survival models. Results reveal an immediate onset of large-scale rural exodus, despite the post-communist crisis. Internal migrants mainly moved to the capital, bypassing secondary cities, and were predominantly female. Initially, international migrants were primarily men who tended to originate from the main urban agglomerations. The diffusion of opportunities to emigrate down the urban hierarchy and across the sexes then redirected the rural exodus abroad, despite domestic economic development. This evolution in population mobility is related to the gendered patterns and interlinkages of the two flows, as well as to rising inequalities within the urban hierarchy.

     

Heterogeneous climate effects on human migration in Indonesia

We examine the effect of anomalous temperatures, rainfall levels, and monsoon timing on migration outcomes in Indonesia. Using panel data from the Indonesian Family Life Survey and high-resolution climate data, we assess whether intra- and inter-province moves are used as a response to climatic shocks. We evaluate the relative importance of temperature, rainfall, and monsoon timing for migration. Only temperature and monsoon timing have significant effects, and these do not operate in the direction commonly assumed. Estimated effects vary according to individuals’ gender, membership in a farm household, and location. We also analyze climate effects on sources of household income, which highlights the multi-phasic nature of household responses. Results undermine narratives of a uniform global migratory response to climate change and highlight the heterogeneous use of migration as a response to such changes. By extending previous research on environmentally induced migration in Indonesia, we also highlight the sensitivity of estimates to alternative climate and migration measures.