Among the remaining tropical forests of lowland Latin America, many are inhabited by indigenous peoples, and the sustainability of their land uses is a point of heated debate in the conservation community. Numerous smallscale studies have documented changes in indigenous land use in individual communities in the context of expanding frontier settlements and markets, but few studies have included larger populations or multiple ethnic groups. In this paper we use data from a regional-scale survey of five indigenous populations in the Northern Ecuadorian Amazon to describe their agricultural land use practices and investigate the factors that affect those practices. We find the areas cultivated by indigenous households to be small compared to those of nearby mestizo colonists, but a large proportion of indigenous cultivated area is in commercial land uses. We also construct multilevel statistical models to investigate the household and community-level factors that affect indigenous land use. The results reveal significant influences on cultivated area from contextual factors such as access to markets, oil company activities, and the land tenure regime, as well as from household characteristics such as demographic composition, participation in alternative livelihood activities, and human, social and physical capitals. Overall the results are most consistent with market integration as an underlying driver of land use change in indigenous territories of the study area.

This paper discusses the linkages between population change, land use, and deforestation in the Amazon regions of Brazil, Bolivia, Colombia, Ecuador, Perú, and Venezuela. We begin with a brief discussion of theories of population-environment linkages, and then focus on the case of deforestation in the Pan Amazon. The core of the paper reviews available data on deforestation, population growth, migration and land use in order to see how well land cover change reflects demographic and agricultural change. The data indicate that population dynamics and net migration exhibit to deforestation in some states of the basin but not others. We then discuss other explanatory factors for deforestation, and find a close correspondence between land use and deforestation, which suggests that land use is loosely tied to demographic dynamics and mediates the influence of population on deforestation. We also consider national political economic contexts of Amazon change in the six countries, and find contrasting contexts, which also helps to explain the limited demographic-deforestation correspondence. The paper closes by noting general conclusions based on the data, topics in need of further research and recent policy proposals.

This paper reviews extant evidence and offers a conceptual framework for the investigation of complex dynamics among human population growth, environmental degradation, poverty, and climate change. The paper introduces theories relating to population growth, environmental degradation, the impact on human well-being, and potential relations with climate change. Poverty is discussed in detail as both a contributing factor to and consequence of population growth and environmental change. The empirical literature on land cover change and environmental change in coastal and marine resources and potential relations with climate change are examined. Despite notable limitations to current knowledge on links among population growth, ecosystems, climate, and poverty, implications for further research and policy application are rich.

To examine differences in land use and environmental impacts between colonist and indigenous populations in the northern Ecuadorian Amazon, we combined data from household surveys and remotely sensed imagery that was collected from 778 colonist households in 64 colonization sectors, and 499 households from five indigenous groups in 36 communities. Overall, measures of deforestation and forest fragmentation were significantly greater for colonists than indigenous peoples. On average, colonist households had approximately double the area in agriculture and cash crops and 5.5 times the area in pasture as indigenous households. Nevertheless, substantial variation in land-use patterns existed among the five indigenous groups in measures such as cattle ownership and use of hired agricultural labor. These findings support the potential conservation value of indigenous lands while cautioning against uniform policies that homogenize indigenous ethnic groups.

Recent research suggests that after decades of population decline, indigenous populations of the lowland tropics of Latin America are now experiencing rapid growth. At the same time, conservationists have pronounced indigenous lands as a key to the future of Amazon forests. As such, conservationists should have a good understanding of indigenous demography and impacts on conservation and development. Yet, there is little depth to understanding of these demographic changes and a dearth of quantitative research on the reproductive practices of indigenous populations. This study addresses these gaps through analyses of a household survey of 648 women of reproductive age from five distinct ethnic populations in the Ecuadorian Amazon. We estimate fertility, analyze reproductive intentions and contraceptive use, and determine the unmet need for reproductive health services. The analyses confirm high fertility rates and high levels of unmet need for contraception. With regard to program and policy implications, we conclude by arguing that isolation and cultural barriers present unique challenges to meet the reproductive health needs of these populations. Innovative approaches, such as those merging population-health-environment topics, may be most relevant for meeting these challenges.

This commentary does not comprehensively review the field's complicated history in identifying and measuring contraceptive needs and population policies which was not always rooted in a rights-based, person-centered lens. A detailed history of the measurement of unmet need can be found elsewhere. 6

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The sea cucumber fishing crisis in Galapagos is an example of the potential consequences of rapid migration, growing economic competition, and weak regulatory mechanisms. In a short period of time sea cucumber fishing has become the most inflammatory issue in the Galapagos. The key factors that allowed for the efficient exploitation of the new resource were not the fishermen themselves but rather the new fishing techniques and access to credit and markets. This suggests that the annual sea cucumber crisis is due to factors more complex than simply more fishermen generating greater sea cucumber catches. This paper examines census data and fisher registries to analyze population growth in the islands. A public opinion survey is used to determine the population's attitudes toward sea cucumber fishing and regulations. Qualitative interviews explore the history of the sea cucumber boom. Information from the sea cucumber monitoring program provides estimates for the annual sea cucumber catches.