two studies conducted is south america's amazon forest show that greater incidence of malaria in newly settled frontier regions is related not just to the increase in human number,but to changes in the landscape itself.
over a year, various researchers collected mosquitoes at 5 sites in states of deforestation along a new road that cuts through the amazon in northeastern Peru. the scientists counted how often the insects landed on humans at each site. their results, published in the January issue of the american journal of tropical medicine and hygiene, reveals that the bite rate from Purus's main malaria- spreading mosquito, anopheles darling i, was nearly 300 time greater in areas cleared for logging, ranching, and other human activities than in areas with less ecological alteration. "by dramatically changing the landscape, we are tipping the balance in a way that is increasing the rick of malaria transmission," says senior author Jonathan Pats, a professor at the university of Wisconsin-Madison's nelson institute for environmental studies.
a report in the February 14 issue of the proceedings of the national academy of sciences pointed to similar links between malaria and deforestation. the study, conducted by a different research team in Brazil's amazon, attributes heightened malaria risk to the increase standing water that comes with tree-clearing and other ecosystem changes in the early stages of human settlement.
new pools of water create ideal egg-laying environments for A. darling i, the scientists note. however, once agriculture and urban development are better established in frontier regions, this breeding habitat declines and malaria transmission rates fall. the amazon research aims to inform efforts to better manager malaria out-breaks, and also confirms the importance of close collaboration between the health and conservation communities. since 1980, more than 50 million hectares of amazon forest has been lost, an area roughly the size of Thailand.
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two studies conducted is south america's amazon forest show that greater incidence of malaria in newly settled frontier regions is related not just to the increase in human number,but to changes in the landscape itself.
over a year, various researchers collected mosquitoes at 5 sites in states of deforestation along a new road that cuts through the amazon in northeastern Peru. the scientists counted how often the insects landed on humans at each site. their results, published in the January issue of the american journal of tropical medicine and hygiene, reveals that the bite rate from Purus's main malaria- spreading mosquito, anopheles darling i, was nearly 300 time greater in areas cleared for logging, ranching, and other human activities than in areas with less ecological alteration. "by dramatically changing the landscape, we are tipping the balance in a way that is increasing the rick of malaria transmission," says senior author Jonathan Pats, a professor at the university of Wisconsin-Madison's nelson institute for environmental studies.
a report in the February 14 issue of the proceedings of the national academy of sciences pointed to similar links between malaria and deforestation. the study, conducted by a different research team in Brazil's amazon, attributes heightened malaria risk to the increase standing water that comes with tree-clearing and other ecosystem changes in the early stages of human settlement.
new pools of water create ideal egg-laying environments for A. darling i, the scientists note. however, once agriculture and urban development are better established in frontier regions, this breeding habitat declines and malaria transmission rates fall. the amazon research aims to inform efforts to better manager malaria out-breaks, and also confirms the importance of close collaboration between the health and conservation communities. since 1980, more than 50 million hectares of amazon forest has been lost, an area roughly the size of Thailand.
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