Featured Research

from universities, journals, and other organizations

E. coli can survive in streambed sediments for months

Date:
July 12, 2011
Source:
USDA/Agricultural Research Service
Summary:
Scientists have confirmed that the presence of Escherichia coli pathogens in surface waters could result from the pathogen's ability to survive for months in underwater sediments.

ARS researchers have discovered that E. coli pathogens can survive for months in underwater sediments, which could improve computer modeling for the bacterial contamination of surface waters.
Credit: NRCS-USDA

Studies by U.S. Department of Agriculture (USDA) scientists have confirmed that the presence of Escherichia coli pathogens in surface waters could result from the pathogen's ability to survive for months in underwater sediments. Most E. coli strains don't cause illness, but they are indicator organisms used by water quality managers to estimate fecal contamination.

These findings, which can help pinpoint potential sources of water contamination, support the USDA priorities of promoting sustainable agriculture and food safety.

Soil scientist Yakov Pachepsky works at the Agricultural Research Service (ARS) Environmental Microbial and Food Safety Laboratory in Beltsville, Md. He is conducting studies to learn more about where the E. coli pathogens in streambeds come from, where they end up, and how long they can survive. ARS is USDA's chief intramural scientific research agency.

Lab studies conducted by Pachepsky and his colleagues suggested that non-pathogenic strains of E. coli can survive much longer in underwater sediments than in the water column itself, and provided the first published evidence that E. coli can overwinter in the sediment.

The results also indicated that the pathogens lived longer when levels of organic carbon and fine sediment particles in the sediment were higher. In addition, when organic carbon levels were higher, water temperatures were less likely to affect the pathogens' survival rates.

The researchers also collected three years of data on stream flow, weather, and E. coli levels in water and sediments from a stream in Pennsylvania that was fed by several smaller tributaries. Then they used the information to calibrate the Soil and Water Assessment Tool (SWAT), a model developed by ARS scientists that predicts how farming practices affect water quality on watershed scale.

The resulting simulations indicated pasture runoff contributed to E. coli levels in nearby streams only during temporary interludes of high-water flows. Since the SWAT model currently does not include data on E. coli levels in streambed sediments, this research indicates that SWAT simulations would overestimate how much E. coli contamination in surface waters is due to pasture runoff.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "E. coli can survive in streambed sediments for months." ScienceDaily. ScienceDaily, 12 July 2011. <www.sciencedaily.com/releases/2011/07/110701121619.htm>.
USDA/Agricultural Research Service. (2011, July 12). E. coli can survive in streambed sediments for months. ScienceDaily. Retrieved October 20, 2014 from www.sciencedaily.com/releases/2011/07/110701121619.htm
USDA/Agricultural Research Service. "E. coli can survive in streambed sediments for months." ScienceDaily. www.sciencedaily.com/releases/2011/07/110701121619.htm (accessed October 20, 2014).

Share This



More Plants & Animals News

Monday, October 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

White Lion Cubs Born in Belgrade Zoo

White Lion Cubs Born in Belgrade Zoo

AFP (Oct. 20, 2014) Two white lion cubs, an extremely rare subspecies of the African lion, were recently born at Belgrade Zoo. They are being bottle fed by zoo keepers after they were rejected by their mother after birth. Duration: 00:42 Video provided by AFP
Powered by NewsLook.com
Traditional Farming Methods Gaining Ground in Mali

Traditional Farming Methods Gaining Ground in Mali

AFP (Oct. 20, 2014) He is leading a one man agricultural revolution in Mali - Oumar Diatabe uses traditional farming methods to get the most out of his land and is teaching others across the country how to do the same. Duration: 01:44 Video provided by AFP
Powered by NewsLook.com
Goliath Spider Will Give You Nightmares

Goliath Spider Will Give You Nightmares

Buzz60 (Oct. 20, 2014) An entomologist stumbled upon a South American Goliath Birdeater. With a name like that, you know it's a terrifying creepy crawler. Sean Dowling (@SeanDowlingTV) has the details. Video provided by Buzz60
Powered by NewsLook.com
Adorable Video of Baby Rhino and Lamb Friend Playing

Adorable Video of Baby Rhino and Lamb Friend Playing

Buzz60 (Oct. 20, 2014) Gertjie the Rhino and Lammie the Lamb are teaching the world about animal conservation and friendship. TC Newman (@PurpleTCNewman) has the adorable video! Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins