Public Release: 

Population movements and money remittances spur forest regrowth

Socioeconomic data, land-use surveys, and satellite imagery document increases in wooded area of El Salvador

American Institute of Biological Sciences

A study of forest cover in El Salvador in the September issue of BioScience presents novel findings on how economic globalization, land policy changes, and monies sent to family members by emigrants have transformed agriculture and stimulated forest regrowth. The study, by Susanna B. Hecht and Sassan S. Saatchi, employed socioeconomic data, land-use surveys, and satellite imagery to document substantial increases in the area of El Salvador covered by both light and heavy woodland since peace accords were signed in 1992.

Most analyses of forest cover in Central America have focused on loss of old-growth forests. In drawing attention to regrowth of woodland in a country that was extensively deforested during the 1970s, Hecht and Saatchi call for a renewed examination of social and economic influences on agricultural practices and their effects on forest extent. New growth forests, most often in a mosaic along with agriculture, can buffer declines in biological diversity and are extensively used by old growth species.

War drove many people to flee El Salvador during the 1980s and early 1990s, which led to many farms being abandoned. The country experienced a net increase in tree cover thereafter. Hecht and Saatchi found a 22 percent increase in the area with 30 percent tree cover, and a 6.5 percent increase in the area with more than 60 percent tree cover. Policies that encouraged sustainable agriculture contributed to the increase, the authors maintain.

Strikingly, they also found a strong link between forest resurgence and remittances of money from family members abroad, chiefly the United States. More than a sixth of El Salvador's population left during the fighting, which helps explain why remittances now exceed direct foreign investment more than eightfold. Apparently, households receiving funds from abroad felt less need to maintain existing fields and also cleared less land. Conservationists should be more cognizant of the power of remittances and agricultural policies to benefit forest regrowth, according to Hecht and Saatchi.


BioScience, the monthly journal of the American Institute of Biological Sciences (AIBS), publishes commentary and peer-reviewed articles covering a wide range of biological fields, with a focus on "Organisms from Molecules to the Environment." The journal has been published since 1964. AIBS is an umbrella organization for professional scientific societies and organizations that are involved with biology. It represents some 200 member societies and organizations with a combined membership of about 250,000.

The complete list of research articles in the September issue of BioScience is as follows:

Dedifferentiation: A New Approach in Stem Cell Research.
Sa Cai, Xiaobing Fu, and Zhiyong Sheng

Globalization and Forest Resurgence: Changes in Forest Cover in El Salvador.
Susanna B. Hecht and Sassan S. Saatchi

Graphical Methods for Exploratory Analysis of Complex Data Sets.
Ronnie L. Yeager, David F. Parkhurst, and Diane S. Henshel

Mountain Plovers and the Politics of Research on Private Lands.
Victoria J. Dreitz and Fritz L. Knopf

Fueling Population Growth in Las Vegas: How Large-scale Groundwater Withdrawal Could Burn Regional Biodiversity.
James E. Deacon, Austin E. Williams, Cindy Deacon Williams, and Jack E. Williams

Understanding the Ghost of Cactoblastis Past: Historical Clarifications on a Poster Child of Classical Biological Control.
S. Raghu and Craig Walton

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.