FIRE ANT MOUND DENSITIES IN THE UNITED-STATES AND BRAZIL (HYMENOPTERA, FORMICIDAE)

To compare fire ant populations (Solenopsis) in North and South America, we surveyed 102 preselected roadside sites, half in the southeastern United States and half in the state of Mato Grosso do Sul, Brazil. Fire ants were considerably more abundant in the United States. They occurred at more sites (100 versus 70%), in higher densities (170 versus 30 mounds/ha), in larger mounds (27.0 versus 13.8 liters), and they constituted a larger fraction of the local ant community (97 versus 13% of occupied baits). These data are consistent with the hypothesis that North American populations of S. invicta have escaped natural biological control; however, cultural and climatic factors are also likely explanations.

Economic relations of Brazil and the United States and the Enterprise for the Americas Initiative

Includes bibliography

The social roots of United States protectionism

Includes bibliography

A collection of documents on economic relations between the United States and Central America, 1906-1956

Includes bibliography

The United States and Latin America and the Caribbean: Highlights of economics and trade

Foreword by Alicia Bárcena

Some considerations on the possible effects of the failure of the United States Congress to renew the ATPDEA

Includes bibliography

Hispanics in the United States

Includes bibliography

Social Security in the United States: Overview and Outlook

Includes bibliography

Development of eco-efficient and sustainable urban infrastructure in Asia and Latin America: eco-efficiency and sustainable infrastructure in the United States and Canada

Incluye bibliografía

Trade in services negotiations: a review of the experience of the United States and the European Union in Latin America

Includes bibliography

Trends in United States trade with Latin America and the Caribbean and trade policy towards the region

Includes Bibliography

Estimating the effects of United States food safety and agricultural health standards on agro-food exports from Latin America and the Caribbean

Includes bibliography

Observatory of customs controls for United States imports: technical standards

Includes bibliography

A comparative study of health care policy in the United States and Canada: what policymakers in Latin America might and might not learn from their neighbors to the North

Includes bibliography

Trade relations between Brazil and the United States

Includes bibliography