Scientists have developed a new way of monitoring Ponto-Caspian gobies, a group of widely invasive fish species, by detecting traces of the fishes’ DNA in river water. They say, in a recent research paper, that it offers a quicker, easier and cheaper way of monitoring the fish than conventional catching or sighting methods.

Free-flowing rivers (FFRs) support a complex, dynamic and diverse range of global ecosystems, and provide important economic and societal services. However, infrastructure built to use these services — most notably 2.8 million dams worldwide — has caused many rivers to become fragmented and disconnected, affecting river biodiversity and ecosystem services. This study constructed a global information system with which to map the fine-scale dynamics and fragmentation of FFRs and to determine how human pressures affect the world’s river systems.

Research in four German rivers indicates that several organic compounds pose a risk of acute toxic effects on invertebrates. Some of these compounds are already priority substances under the EU Water Framework Directive1 (WFD); others could warrant designation at least as river basin specific pollutants in the German River Basin Management Plans.

A new modelling study has indicated that rivers could be the main pathway of mercury entering the Arctic Ocean. More research is needed to support this claim, but climate change could be increasing the release of mercury into rivers through thawing permafrost and increased wildfires.

To date, it has been difficult to collect data that are robust enough to demonstrate specific effects of chemical pollution in rivers on aquatic wildlife. However, a recent study combining detailed chemical, toxicological and ecological data in three European river basins now provides evidence linking cause and effect by revealing significant differences in the effects of differently polluted sediments on the organisms living in the river basins and the riverbed biodiversity.

Changes in complex microbial communities known as ‘biofilms’ at the bottom of rivers can reveal the effects of pesticide and pharmaceutical pollution of river water, according to a recent study. Painkillers and anti-inflammatory drugs were found to have a significant effect on the structure and functioning of the biofilms.

Concentrations of three pharmaceuticals (ethinylestradiol, oestradiol and diclofenac), have been mapped in a recent study of European rivers. The researchers predict that levels of ethinylestradiol, a contraceptive and hormone replacement drug, could exceed the WFD's suggested environmental quality standards in 12% of the total length of Europe’s rivers

Brown trout (Salmo trutta) embryos exposed to oestrogen during development hatched earlier, grew more slowly and had a lower heart rate than unexposed individuals, according to a recent Swiss study. These findings may indicate that oestrogen pollution in some European rivers is contributing to the decline of wild populations of such species.

The emissions of two perfluoroalkyl acids (PFAAs) into the Danube River Basin have been estimated in a test of four different hypotheses regarding the factors affecting those emissions. The results were used to simulate water concentrations for comparison with measured data. The researchers found that incorporating wastewater treatment information and wealth distribution alongside population data can improve the accuracy of emissions estimates.

Researchers have recommended that fish from some sections of the River Po and the River Lambro, one of the Italian River Po tributaries, should not be eaten due to high levels of some endocrine-disrupting chemicals in the river sediments and fish. This recommendation is based on an extensive update regarding pollution levels of such substances in the rivers.

Researchers have developed a new approach to hierarchise pesticides based on their risk to or via the aquatic environment, which has been implemented in the Pinios River Basin of Central Greece. The analysis indicated that a number of pesticides were found in concentrations that could cause negative impacts on aquatic ecosystems. The results provide detailed information to inform decisions regarding the monitoring of pesticides in the Pinios River Basin and outline an approach that could be used in other watersheds.

Up to 90% of consumed drugs enter the environment. This may have negative effects on wildlife, especially when the drugs take long periods to break down. This study assessed the breakdown of sulphonamides — a class of antibacterials — in samples from two rivers in Poland. The results showed that sulphamethoxazole, a common veterinary antibiotic, was the most persistent and that various factors inhibit degradation, including low temperatures, heavy metal pollution and low pH.

Long-chain perfluoroalkyl acids (PFAAs) are persistent chemicals with proven toxic effects. This study estimated the emissions and concentrations of two such chemicals, perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA), in 11 of Europe's most populated river catchments. Estimated emissions were lowest in the Thames and highest in the Rhine, while the EU environmental quality standard for PFOS was exceeded in all rivers. This study provides a picture of PFAAs contamination in rivers across Europe, and makes recommendations for achieving reductions.

Traces of animals’ DNA in the environment, known as environmental DNA (eDNA), can be monitored to paint a picture of biodiversity, new research shows. This study used eDNA to assess biodiversity in an entire river catchment in Switzerland. Importantly, the eDNA technique allowed the researchers to detect both aquatic and land-based species in river water, making it possible to assess biodiversity over a broad scale.

Mazda MX-30

CULPEPER — The Virginia Department of Transportation will close the Route 674 (Clark Road) bridge over a branch of the Moormans River in Albemarle...

FREDERICKSBURG , Va. – An additional evening of work is required this week for an ongoing pin replacement on the Robert O. Norris Bridge, and...

FREDERICKSBURG , Va. – An additional evening of work is required this week for an ongoing pin replacement on the Robert O. Norris Bridge, and...

NOV. 12, 2018 UPDATE: All lanes of Route 3 over the Rappahannock River between Lancaster and Middlesex counties will remain open this evening, Nov....

SALEM – As part of the ongoing construction to replace the bridge over Back Creek on Route 220, an extended lane closure has been scheduled for next week. The bridge is near the intersection of Route 657 (Crowell Gap Road and Winter Drive).  Beginning Monday, October 8 at 9 a.m., the right northbound lane of Route 220 and the crossover at Crowell Gap Road will be closed until Wednesday, October 10 at 5 p.m. to pave a segment of the roadway that will connect to the new bridge. Drivers traveling on Route 220 northbound into Roanoke should expect significant delays on Route 220 during this time and are encouraged to plan their travel accordingly. The bridge replacement is expected to be complete in spring 2020. For updates on this project and other traffic impacts and lane closure, visit www.511Virginia.org .

SALEM – Throughout the afternoon and evening, crews with the Virginia Department of Transportation have been responding to the immediate concerns of downed trees, mudslides and high water throughout southwestern Virginia. Crews will continue to monitor roadways overnight. As of 10 p.m., roads in all 12 counties of the district have been affected by the heavy rainfall resulting in numerous closures of primary and secondary roads today. Some of the primary roads affected include portions of Interstate 81, Route 220 through Roanoke and Franklin County, Route 419 in Roanoke, Route 58 in Patrick County and Route 57 in Henry County. As streams and rivers swell and water recedes, conditions will continue to change, so motorists should drive with caution and check the latest road conditions before travelling tomorrow morning. The most up-to-date information about flooded roads is available at www.511Virginia.org . To access the list of flooded roads, look for the text views section of the site and search under road conditions.  VDOT encourages motorists to stay off the roads tonight, if possible, and not to drive through ponding water or around barricades.  As water recedes, VDOT will inspect structures and roadways before they can reopen or be repaired.  Some roads may require lengthy closures depending on the extent of damage and how soon repairs can be completed. To report downed trees or debris on state maintained roads, citizens can contact VDOT’s customer service center at 1-800-FOR-ROAD. For emergencies, dial 911. Follow us on Twitter at @VaDOTSalem and @511southwestva  for the latest updates on road conditions.

SALEM – The left lane of southbound Route 220 is closed due to a slope failure in the median just south of the Franklin County line. The lane closure begins approximately one mile prior to  the Roanoke County and Franklin County line and just north of the intersection with Route 613 (Naff Road).   Drivers should prepare for travel delays and plan accordingly. Message boards are in place to alert motorists of the closure. The Virginia Department of Transportation is currently investigating to determine what repairs need to be made. The lane will remain closed until further notice.   For updates on this lane closure, visit www.511Virginia.org .

SALEM – The recent flooding and heavy rainfall has resulted in several slope and shoulder failures along Route 220 in Roanoke and Franklin Counties. During the next week, crews will be working to repair the damage and commuters and travelers will be impacted. Route 220 Southbound between Buck Mountain Road and Yellow Mountain Road in Roanoke County The right lane of southbound Route 220 is closed due to a slope failure on the right shoulder of the road between Buck Mountain and Yellow Mountain Road in Roanoke County.  High water from the heavy rains caused a rock slide that impacted the shoulder of the roadway. The weight caused the shoulder to collapse resulting in the road being pushed out and giving way. The right lane closure will remain in place through Monday evening, weather permitting. Crews are developing a plan to repair the pipe and plan to begin work over the weekend.   Route 220 Southbound at Franklin County Line The left lane of southbound Route 220 has been closed due to a slope failure in the median just south of the Franklin County line. VDOT crews have been working to determine how a pipe under the road has failed and how to proceed with repairs. At this time, the ground continues to settle and move, therefore, the lane will remain closed through the weekend and into Monday . The lane closure is located approximately one mile prior to the Roanoke County and Franklin County line and just north of the intersection with Route 613 (Naff Road).  Route 220 Shoulder Repairs There will be alternating right and left lane closures on southbound and northbound Route 220 next week, weather permitting, to repair shoulders that have been damaged by the heavy rainfall. Drivers using Route 220 southbound and northbound should plan ahead for significant delays during this time until repairs can be made and lane closures are removed. Drivers should plan ahead accordingly. For updates on this lane closure, visit www.511Virginia.org .

SALEM – The Virginia Department of Transportation encourages race fans driving to and from Martinsville Speedway for the race on Sunday, October 28, to follow recommended traffic patterns as posted on signs and message boards. Drivers travelling from Roanoke to the Martinsville Speedway for the race events this weekend should plan for possible delays due to a left lane closure on Route 220 southbound approaching the Boones Mill area. VDOT will place many signs and changeable message boards throughout the region to assist travelers. Vehicular and pedestrian traffic will be heavy. Traffic is being routed to the speedway in certain patterns to minimize overall congestion as much as possible. Watch for the speed limit to reduce gradually from 65 mph to 35 mph on the Route 220/Route 58 Bypass as you approach the speedway. From Roanoke and areas north of Martinsville: Race fans traveling south on Route 220 are encouraged to allow for extra travel time. A left lane closure is in place for a pipe failure in the median about eight miles south of Roanoke and 1.7 miles north of Boones Mill. Drivers can take the exit onto Route 58 to Martinsville to reach the track or they can continue on the Route 220/Route 58 Bypass past the speedway interchange and turn right onto the access road that leads into the speedway. The entrance is located one mile east of the Route 220 interchange and may provide easier access. Signs are in place designating the entrance to the speedway.  From Danville and areas east of Martinsville: Motorists on the Route 58 Bypass should follow signs directing them to use the track’s back gate. This entrance is located off the bypass, east of the track. From Greensboro and areas south of Martinsville: Route 220 northbound traffic will split into three lanes shortly before reaching the speedway.  Motorists should watch for electronic message boards and obey police directing traffic. Through traffic should use the left lane. From Stuart and areas west of Martinsville: Motorists should stay on Route 58 east and follow signs and message boards to the track.  ADA Parking: Race fans needing ADA Parking are encouraged to enter the Speedway via Old Sand Roa Those attending the race should closely follow directional information and plan to arrive early and expect heavy traffic and delays. Martinsville Speedway has shared the attached graphics for drivers entering and exiting from the race.

SALEM – A crash involving a tractor-trailer has closed exit 143 on I-81 this morning. Access to I-81 from I-581 and access to I-581 from I-81 has been impacted and drivers will need to seek alternate routes during the morning commute. I-81 southbound to exit 143 with access to I-581 southbound is closed. Travelers on southbound I-81 requiring access to I-581 will need to use Route 11 to Peters Creek Road or use Route 460 at exit 150 to return to I-581 or to access the downtown Roanoke area. I-581 northbound to I-81 southbound is closed. Travelers on I-581 from Roanoke heading to Salem using I-81 will need to use Peters Creek Road or other side roads for access back to I-81 at exit 141. In addition, drivers traveling on I-81 northbound and from I-581 to access northbound I-81 should expect delays and heavy congestion. The right lane of I-81 northbound at exit 143 is also closed. Drivers should expect delays in this area through at least 8 a.m. and further delays are possible through the morning.

The well-known TV personality and attorney posted a shirtless photo of himself on Twitter, but deleted it hours later.

With the all-electric Nissan Leaf, your home acts as the car's primary 'filling station.' How will this impact potential buyers who live in apartments or don'

An accident in Montana is the latest in a long and troubled line of pipeline incidents in America.

While wildfires burn Oregon's Columbia River Gorge, volunteers are eager to help rebuild it.

The enchanting yet highly controversial 'magical new green space' has many Londoners fired up over issues of funding, aesthetics and accessibility.

Jason deCaires Taylor's sculptural commentary on fossil fuels comes and goes with the tides.

Could this be a Christmas miracle in London ... or the ultimate cold weather pipe dream?

An uptick in seahorse spottings in London is a sign that the iconic English waterway is getting cleaner by the year.

Environmental group 10:10 Climate Action sees untapped potential in waste heat extracted from waterways buried beneath the British capital.

Dean Corren's vision of a greener world includes using New York City's East River to produce electricity. As technology director at Verdant Power, he's trying t

An 18-year-old pizza delivery driver surprises a family in Detroit by playing piano for them.

The Washington, D.C., river epitomizes the ecological dangers that plague many U.S waterways, according to a national environmental group.

How do you clean up a river? The answer is twofold: treatment and dilution.

The color looks radioactive, but activists promise it is nontoxic and harmless to marine life.

Neolithic humans in the Wadi Faynan region of southern Jordan may have polluted the river while first learning how to smelt.

As much as 66 metric tons of human excrement from visitors to Alaska's Denali National Park could soon be released into the pristine Alaskan coast.

More than half of the country’s rivers and streams are suffering from nutrient pollution and habitat degradation; mercury and bacteria a problem as well.

Every once in a while, humanity manages to do something so sublimely awful that all we can do is laugh. Next month, we’ll mark the 40th anniversary of one of

'Where the River Runs' is a pop-up meadow with a deep environmental message.

In the face of warming temperatures and the increased demand placed on supply by human needs, some of the world's largest lakes, rivers and seas are dwindling a

The Santa Cruz River, nearly dry for almost a century, may soon flow once more through downtown Tucson.

'If you see me, weep,' reads one of these so-called 'hunger stones.'

Kentucky residents and wildlife benefit from improved water quality with the dam removed in the Green River.