In many tropical zones around the world, small family farms can match or exceed the productivity of industrial-scale operations, according to U-M researchers Ivette Perfecto and John Vandermeer. At the same time, smaller diversified farms are more likely to help preserve biodiversity in tropical regions undergoing massive amounts of deforestation, Perfecto and Vandermeer conclude in a paper to be published online Feb. 22 in the Proceedings of the National Academy of Sciences (PNAS).
"Most of the tropical forest that's left is fragmented, and what you have are patches of forest surrounded by agriculture," said Perfecto, a professor at the School of Natural Resources and Environment. "If you want to maintain biodiversity in those patches of forest, then the key is to allow organisms to migrate between the patches.
"And small-scale family farms that adopt sustainable agricultural technologies are more likely to favor migration of species than a huge, monocultural plantation of soybeans or sugar cane or some other crop."
Some ecologists have suggested that the history of eastern North American forests provides a preview of what's likely to happen in the tropics. European colonization of eastern North America led to massive deforestation that accompanied the expansion of agriculture. Later, industrialization drew people to cities from the rural areas, and the forests recovered.
This scenario is known as the forest transition model. It has been argued that if a similar progression occurs in the tropics, then the decline in rural populations would make more land potentially available for conservation. A corollary of the forest transition model states that if you consolidate agriculture into large, high-tech farms, productivity increases and more land is freed up for conservation.
But after reviewing case studies from Costa Rica, El Salvador, Panama, Argentina, Brazil and Mexico, Perfecto and Vandermeer conclude "there is little to suggest that the forest transition model is useful for the tropics" and that it "projects an overly optimistic vision."
Instead, the U-M researchers propose an alternative model, which they call the matrix quality model. They say it provides a solid foundation for conservation planning in tropical regions.
If you think of the fragments of remaining tropical forest as islands in an ocean of agriculture, the ocean is what Perfecto and Vandermeer call the matrix---it's the area between the patches of undisturbed natural habitat.
A high-quality matrix is one that enables plants and animals to migrate between the remaining patches of forest, increasing the likelihood that a given species will be able to survive, helping to preserve biodiversity.
Small, family-owned farms that use agroecological techniques come closest to mimicking natural forest habitat, thereby creating corridors that allow plants and animals to migrate between forest fragments. Agroecological techniques can include the use of biological controls instead of pesticides, the use of compost or other organic matter instead of chemical fertilizers, and the use of agroforestry methods, which involve growing crops beneath a canopy of trees or growing crops mixed with fruit trees such as mangoes or avocados.
"If you're really interested in conserving species, you should not just concentrate on preserving the fragments of natural habitat that remain, even though that's where many species are," said Vandermeer, a professor of ecology and evolutionary biology and a professor at the School of Natural Resources and Environment. "You also need to concentrate on the areas between the fragments, because those are the places that species have to migrate through."
Vandermeer said he advocates the break-up of large-scale farms in the tropics, as well as incentives to encourage "a large number of small-scale farmers, each managing the land to the best of his or her ability, using agroecological techniques."
Perfecto said these goals are in line with the findings of the 2009 International Assessment of Agricultural Knowledge, Science and Technology for Development synthesis report. The report concluded that small-scale, sustainable farms are the best way to alleviate world hunger while promoting sustainable development. Perfecto was one of the report's authors.
The PNAS article by Perfecto and Vandermeer is part of a special report in the journal about solutions to the world food crisis. Perfecto, Vandermeer and Angus Wright discuss the links between agriculture, conservation and food sovereignty in their book "Nature's Matrix," published last year by Earthscan.
Jim Erickson | EurekAlert!
International network connects experimental research in European waters
21.03.2017 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
World Water Day 2017: It doesn’t Always Have to Be Drinking Water – Using Wastewater as a Resource
17.03.2017 | ISOE - Institut für sozial-ökologische Forschung
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy