United States Trade Developments 2013-2014

United States Trade Developments 2013-2014, is an annual report prepared by the ECLAC Washington Office. It provides an overview of the most relevant trade developments in the United States trade relations with Latin America and the Caribbean and the measures that inhibit the free flow of goods among countries in the Western Hemisphere. The report presents trade figures and trends over the last few years to illustrate the nature of the U.S. engagement through trade with the world and with the Latin America and Caribbean region. Special emphasis was given to trade among the U.S., Canada, and Mexico on the 20th anniversary of the North American Free Trade Agreement, and to trade with Brazil, the second U.S .trade partner in the region, after Mexico.

United States Trade Developments 2014-2015

United States Trade Developments, 2014-2015, provides an overview of the most relevant trade developments in the United States trade relations with Latin America and the Caribbean and the measures that inhibit the free flow of goods among countries in the Western Hemisphere.The report presents trade figures and trends over the last few years to illustrate the nature of the U.S. engagement through trade with the world and with the Latin America and Caribbean region.

Nutrient enrichment is related to two facets of beta diversity for stream invertebrates across the united states

Beta diversity, the spatial or temporal variability of species composition, is a key concept in community ecology. However, our ability to predict the relative importance of the main drivers of beta diversity (e. g., environmental heterogeneity, dispersal limitation, and environmental productivity) remains limited. Using a comprehensive data set on stream invertebrate assemblages across the continental United States, we found a hump-shaped relationship between beta diversity and within-ecoregion nutrient concentrations. Within-ecoregion compositional dissimilarity matrices were mainly related to environmental distances in most of the 30 ecoregions analyzed, suggesting a stronger role for species-sorting than for spatial processes. The strength of these relationships varied considerably among ecoregions, but they were unrelated to within-ecoregion environmental heterogeneity or spatial extent. Instead, we detected a negative correlation between the strength of species sorting and nutrient concentrations. We suggest that eutrophication is a major mechanism disassembling invertebrate assemblages in streams at a continental scale.

A United States Information Agency e sua ação no Brasil de 1953 a 1964

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