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The Conversation U.S.
Counter-drug strategies in Central America are worsening deforestation, threatening many species of birds
By Amanda D. Rodewald, Cornell University,
1 day ago
Baltimore orioles breed in eastern and central North America, then migrate south to wintering grounds in Florida, the Caribbean and Central America. phototrip/istock via Getty Images
Activities associated with cocaine trafficking threaten two-thirds of the most important landscapes in Central America for 196 forest bird species, including 67 migratory species. This is the key takeaway from a study that colleagues and I published in June 2024 in the journal Nature Sustainability .
Our findings suggest that there is real potential for drug-related deforestation to negatively affect populations of migratory birds. Many of these species are unusually concentrated in winter in Central America, which has a comparatively smaller area than their summer breeding regions in North America.
For 1 in 5 migratory species that travel to Central American forests annually, including familiar birds like the Baltimore oriole , more than 50% of their global population winters in areas that are becoming more attractive to traffickers. For half of migratory species, at least 25% of their populations winter in these areas.
Baltimore orioles are widely dispersed across the U.S. and Canada during breeding season, but are much more concentrated in Central America and northern South America in winter. eBird , CC BY-ND
Nearly half of Earth’s migratory bird species are declining, and 1 in 5 species are at risk of extinction . Since 1970, North America alone has lost 3 billion breeding birds – more than 25% of its total population . Birds perform many important ecological roles, including eating insects, pollinating plants and dispersing seeds, and their presence often is a reliable measure of the overall health of an ecosystem.
These activities, in turn, often lead to further forest loss, development and criminal activities. In some Central American countries, so-called narco-deforestation is estimated to account for nearly one-third of all deforestation .
A growing body of evidence suggests that current drug policies and interdiction strategies, which focus almost exclusively on drug suppliers, are making narco-deforestation worse . Traffickers may respond to interdiction efforts by shifting activities to more remote and intact forested areas – zones that are especially important for wildlife.
Black polygons on this map highlight areas in Central America that provide habitat in winter for migratory birds and are becoming more suitable for narco-trafficking. In North America, darker colors indicate regions that support greater numbers of these species during breeding season. Rodewald et al., 2024 , CC BY-ND
How we did our work
More than 1 million birdwatchers have submitted data to eBird , a global participatory science initiative that collects observations to document bird distribution, abundance, habitat use and trends. This information helps scientists understand in detail how numbers of birds in particular locations change through the year, and to diagnose and mitigate key threats to bird populations.
In our study, we combined eBird data on bird abundance and distribution with previously published information on changes in the likelihood that landscapes would experience cocaine trafficking in the future . We summarized these changes as a measure of “suitability” for drug-related activities.
Suitability, in this case, was estimated from social and environmental features that have been shown to be attractive to narco traffickers. For example, areas that are forested, far from roads and sparsely populated are more likely to conceal activities than heavily used areas near towns.
This map shows important landscapes for 67 migratory forest bird species (purple) in Central America; areas becoming more suitable for narco-trafficking (peach); and zones where these two uses overlap (brown). Rodewald et al., 2024 , CC BY-ND
What’s next
Our study adds to existing evidence that drug interdiction efforts may push trafficking activities into increasingly remote and forested areas, many of which provide important habitat for migrating birds. Narco-trafficking is just one reminder that the futures of humans and nature are tightly intertwined.
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This article is republished from The Conversation , a nonprofit, independent news organization bringing you facts and trustworthy analysis to help you make sense of our complex world. It was written by: Amanda D. Rodewald , Cornell University
Amanda D. Rodewald does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond her academic appointment.
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