Navigation Links
Deforestation in the Amazon equals net losses of diversity for microbial communities
Date:12/24/2012

Research from an international team of microbiologists has revealed a new concern about deforestation in the Amazon rainforest a troubling net loss in the diversity among the microbial organisms responsible for a functioning ecosystem.

The group, which includes professors from The University of Texas at Arlington, University of Oregon, University of Massachusetts, Michigan State University and University of Sao Paulo, sampled a 100 square kilometer area, about 38 square miles, in the Fazenda Nova Vida site in Rondnia, Brazil, a location where rainforest has been converted to agricultural use. Their findings in part validated previous research showing that bacteria in the soil became more diverse over the years, as it was converted to pasture.

But their findings contradicted prior thinking by showing that the loss of restricted ranges for different kinds of bacteria communities resulted in a biotic homogenization and net loss of diversity overall. Scientists worry that the loss of genetic variation in bacteria across a converted forest could reduce ecosystem resilience.

"We have known for a long time that conversion of rainforest land in the Amazon for agriculture results in a loss of biodiversity in plants and animals. Now we know that microbial communities which are so important to the ecosystem also suffer significant losses," said Jorge Rodrigues, the University of Texas at Arlington assistant biology professor who was part of the research team and is first author on a recent publication of the findings.

The new research is described in a paper appearing online the week of Dec. 24-28 in advance of publication in the Proceedings of the National Academy of Sciences. The paper is called "Conversion of the Amazon rainforest to agriculture results in biotic homogenization of soil bacterial communities."

Klaus Nsslein, project director for the published research and associate professor of microbiology at the University of Massachusetts, said the team found important differences between the pasture and forest soil. For example, the number of bacterial species in the pasture soil was higher, but those species were also less related to one another than species in the forest soil.

"The combination of loss of forest species and the homogenization of pasture communities together signal that this ecosystem is now a lot less capable to deal with additional outside stress," Nsslein said.

In addition to Rodrigues and Nsslein, co-authors of the paper include: Babur Mirza, UT Arlington; Vivian Pellizari, Siu Mui Tsai, Brigitte Feigl and Fabiana Paula, the University of Sao Paulo (Brazil); Rebecca Mueller and Brendan Bohannan, University of Oregon; Kyunghwa Baek and George Hamaoui, University of Massachusetts; Ederson da C. Jesus, Embrapa-Agrobiologia (Brazil) and James Tiedje, Michigan State University.

"Our findings are especially important because they support the idea that microbes are impacted by human-caused environmental change," said Bohannan, director of the University of Oregon's Center for Ecology and Evolutionary Biology. This knowledge is important because microbes are responsible for critical environmental processes, such as the recycling of nutrients, the production of clean water and the removal of pollutants, Bohannan said.

Tiedje said the unique study was conducted on a scale that had not been attempted before.

"The systematic and large-scale sampling design of this study gave us the power to see the homogenization," he said.

Scientists on the research team hope their work will provide valuable data to those making decisions about the future of the Amazon rainforest.

"The Amazon represents half of the world's rainforest and is home to one-third of Earth's species, yet the Amazon has one of the highest rates of deforestation," co-authors Pellizari, Tsai and Feigl said in a joint statement. "Agriculture is one of the largest and most dynamic parts of Brazil's economy, so dealing with standing rainforests in the tropics will be tricky, but nevertheless, it is vital that the issue is tackled." Rodrigues said the research team is currently compiling findings about the potential for recovery of the microbial diversity after pastureland is abandoned and returned to "secondary forest."

"Whether bacterial diversity will completely recover from ecosystem conversion will depend in part on whether the taxa lost due to conversion are truly locally extinct or whether they are present in the pasture sites but of such low abundance that they are undetectable in our study," the paper said.


'/>"/>

Contact: Traci Peterson
tpeterso@uta.edu
817-521-5494
University of Texas at Arlington
Source:Eurekalert  

Related biology news :

1. Time, place and how wood is used are factors in carbon emissions from deforestation
2. 800-year-old farmers could teach us how to protect the Amazon
3. Scientists reconstruct pre-Columbian human effects on the Amazon Basin
4. As Amazon urbanizes, rural fires burn unchecked
5. Warming climate unlikely to cause extinction of ancient Amazon trees, study finds
6. Climate warming unlikely to cause near-term extinction of Amazon trees, but threats remain
7. Nanobubbles plus chemotherapy equals single-cell cancer targeting
8. Less couch time equals fewer cookies
9. Snakes minus birds equals more spiders for Guam
10. Scientists provide first large-scale estimate of reef shark losses in the Pacific Ocean
11. Ozones impact on soybean yield: Reducing future losses
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Deforestation in the Amazon equals net losses of diversity for microbial communities
(Date:3/28/2017)... , March 28, 2017 The ... Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, ... Region - Global Forecast to 2022", published by MarketsandMarkets, ... 2016 and is projected to reach USD 75.64 Billion ... and 2022. The base year considered for the study ...
(Date:3/24/2017)... , March 24, 2017 The Controller General ... Controller Mr. Abdulla Algeen have received the prestigious international IAIR ... Continue Reading ... ... picture) and Deputy Controller Abdulla Algeen (small picture on the right) have ...
(Date:3/23/2017)... -- The report "Gesture Recognition and Touchless Sensing Market by Technology ... Forecast to 2022", published by MarketsandMarkets, the market is expected to be worth ... and 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... ... genomics analysis platform specifically designed for life science researchers to analyze and ... researcher Rosalind Franklin, who made a major contribution to the discovery of ...
(Date:10/11/2017)... LINDA, CA (PRWEB) , ... October 11, 2017 ... ... to upregulate any gene in its endogenous context, enabling overexpression experiments and avoiding ... (CRISPRa) system with small RNA guides is transformative for performing systematic gain-of-function studies. ...
(Date:10/11/2017)... (PRWEB) , ... October 11, 2017 , ... ComplianceOnline’s Medical ... place on 7th and 8th June 2018 in San Francisco, CA. The Summit brings ... well as several distinguished CEOs, board directors and government officials from around the world ...
(Date:10/11/2017)... 2017  VMS BioMarketing, a leading provider of patient support ... Nurse Educator (CNE) network, which will launch this week. The ... health care professionals to enhance the patient care experience by ... other health care professionals to help women who have been ... ...
Breaking Biology Technology: