From: Rhett Butler, MONGABAY.COM, More from this Affiliate
Published June 25, 2012 03:52 PM

Small farmers cause substantial damage in the Amazon rainforest

Small farmers are less likely than large landowners to maintain required forest cover on their property in the Brazilian Amazon, worsening the environmental impact of their operations, reported a researcher presenting at the annual meeting of the Association for Tropical Biology and Conservation (ATBC) in Bonito, Brazil.


Fernanda Michalski, an ecologist with the University of São Paulo and the Pro-Carnivores Institute, analyzed forest cover trends on properties of various sizes in Alta Floresta in the southern Amazon and conducted interviews with farmers on the presence of wildlife on their holdings. She found that small properties (under 440 ha) tend to have less forest cover. Riparian zones are less likely to be maintained, reducing the connectivity of what forest patches do survive, making it more difficult for wildlife to move. Smaller forest blocks were affected by edge effects, leaving them without the cool, dark, stable conditions of the forest interior that some species require. Accordingly large-bodied mammals, birds, and reptiles are scarce on smallholder properties.

"Degradation caused by deforestation patterns in these small properties have a disproportionally large impact on Amazon forest conservation," she said.

In contrast to small farms, holdings over 1,000 ha retained 50-60 percent of forest cover. Brazil's Forest Code mandates 80 percent forest cover on private holdings, but the law is poorly enforced. Nevertheless, Michalski's findings suggest large landowners seem to be respecting the law to a degree.

The findings have implications for conservation. With deforestation dropping sharply in the Brazilian Amazon in recent years, a greater proportion is being driven by smallholders, which are more numerous and therefore more difficult to stop. Smallholder clearing may also fall below the threshold of Brazil's near-real time deforestation monitoring system so it's not detected by authorities until well after it happens.

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