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Montana State University researchers highlight bears' use of Banff highway crossings
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Public release date: 2-Aug-2013[ | E-mail |
Share ] Contact: Evelyn Boswell
evelynb@montana.edu
406-994-5135
Montana State University
BOZEMAN, Mont. Within sight of the Trans-Canada Highway, a team of ecologists with the Western Transportation Institute at Montana State University set out on foot for a nearby site where they'd strung wire snags to catch the fur of passing bears.
In the short distance they walked, with Canada's busiest transportation artery paralleling a prime patch of buffalo berries in the Bow River bottomland, the team spotted five grizzly bears, including a sow with two cubs.
Since counting and genetically identifying bears was critical for Mike Sawaya, Tony Clevenger and Steven Kalinowski's three-year field study on the effects of the highway's wildlife crossing structures on Banff National Park bear populations, it was all in a day's work, Sawaya said.
"We spent a ton of time in the backcountry and had a lot of really great days out there," said Sawaya, a 2012 graduate of MSU. "Fortunately we never had any really scary experiences. But seeing those particular bears, thankfully from a safe distance, did illustrate that the Trans-Canada Highway wildlife crossings allow safe access to that low-elevation Bow River habitat."
Sawaya said roads are the most common form of man-made disruption to wildlife habitat and, in the case of the Trans-Canada Highway, pose a direct threat to a threatened Alberta grizzly bear population. The study of how bears use wildlife crossings was part of Sawaya's doctoral work, for which he teamed up with Alberta-based wildlife biologist Clevenger, a senior research scientist at WTI, and Kalinowski, an associate professor of ecology at MSU who was Sawaya's adviser.
The 25 wildlife crossings in Banff were installed during the 1990s, to keep motorists and wildlife safe. Two of the crossings are overpasses built with enough width and vegetation to resemble the surrounding forest. The rest of the structures are culverts or bridges. The crossings work in conjunction with high fencing installed along the roadway to keep wildlife out of a stream of traffic that brings millions of vehicles to Banff and through the Canadian Rockies. In addition to bears, the crossings have seen documented use by deer, elk and moose, as well as wolves, wolverines, lynx, cougars and a host of other animals.
Last week, coinciding with the Society of Conservation Biology's biennial international conference, Sawaya, Clevenger and Kalinowski published a paper in the journal Conservation Biology detailing what genetic testing on 10,000 hair samples showed about the demographic effect the Banff crossings have on area bear populations.
Their results offered an encouraging assessment that a highway punctuated with 25 different crossings did not fragment the habitat in a way that prevented bears from seeking food, shelter and dispersal areas on either side of the Trans-Canada Highway.
"This is a landmark study because it's the first time anyone has done extensive genetic sampling to address unanswered questions about the use of highway crossings by bears," Clevenger said. "We knew that bears used the crossings, we just didn't know how many, what percentage of each species' population uses them, whether there is a preference by males or females to use crossings, and if there was a gender or species preference for overpasses or underpasses."
Another paper from the study due this fall will break down what ecologists call "gene flow" between bear populations in the Banff ecosystem. That data should help gauge how well the crossing structures perform in allowing different bears to find mates in an ecosystem bisected by a major highway.
"By collecting the genetic data on each bear using the crossings, we have a much more powerful tool for gauging the effectiveness of the crossing structures to provide connectivity within the ecosystem," Clevenger added.
In 2006, Sawaya, Clevenger and Kalinowski began setting out noninvasive hair snags strands of barbed wire strung across the wildlife crossings, hair traps with wire snags that collect samples from bears lured to a scent and rub trees with wire attached. Over the next three years, the MSU scientists and assistants collected hair samples from 20 crossings, 420 hair traps and 497 dispersed rub trees.
Once the genetic testing was finished, Sawaya said they could identify 15 individual grizzly bears and 17 individual black bears that used the highway crossings over the three years, which Sawaya said paints a good picture of the demographic connectivity provided by the crossing structures. During the study, close to 20 percent of the grizzly and black bears in Banff used the crossings. Grizzlies were more likely to use the overpasses, while black bears were more likely to use underpasses.
Sawaya said research shows that movement of more than 10 percent of a population through the highway barrier signals there is sufficient connectivity to maintain a healthy ecosystem for bears and other large mammals.
Clevenger, who has been tracking the numbers of bear crossings on the Trans-Canada Highway crossing structures for over a decade as part of the Banff Wildlife Crossings Project, said the study's findings are a breakthrough.
"This is confirmation of what our previous investigations have suggested but couldn't confirm," Clevenger said. "We were pretty certain that the numbers of bears using the crossings had steadily increased. Now we know."
The use of wildlife crossings to protect motorists and wildlife on the Trans-Canada Highway in Banff has been a model for similar projects elsewhere. WTI has been consulting on proposed projects with similar goals in countries around the world, from Mongolia, to China, to Brazil.
In Montana, where U.S. Highway 93 runs through the southern Flathead Valley, it runs near prime grizzly bear habitat in the Mission Mountains and the Bob Marshall Wilderness complex. At the request of the Confederated Salish and Kootenai Tribes, the Montana Department of Transportation installed more than 40 wildlife crossings on the Flathead Reservation.
WTI is researching wildlife habits at those crossings also to assess their success in improving habitat. The multiyear study is set to run through 2015, according to Rob Ament, manager of WTI's Road Ecology Program.
Ament said the research WTI scientists are doing in Banff and on the Flathead Reservation is a fundamental part of its mission to provide solutions to transportation problems in the rural West, where wildlife and wildlife-vehicle collision are a common occurrence.
"Between Banff and the U.S. 93 project, we're talking about the two largest wildlife mitigation projects for highways in North America, if not the world," Ament said. "The lessons we learn will be shared with transportation practitioners not only here in the United States but also with those around the globe."
###
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AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Public release date: 2-Aug-2013[ | E-mail |
Share ] Contact: Evelyn Boswell
evelynb@montana.edu
406-994-5135
Montana State University
BOZEMAN, Mont. Within sight of the Trans-Canada Highway, a team of ecologists with the Western Transportation Institute at Montana State University set out on foot for a nearby site where they'd strung wire snags to catch the fur of passing bears.
In the short distance they walked, with Canada's busiest transportation artery paralleling a prime patch of buffalo berries in the Bow River bottomland, the team spotted five grizzly bears, including a sow with two cubs.
Since counting and genetically identifying bears was critical for Mike Sawaya, Tony Clevenger and Steven Kalinowski's three-year field study on the effects of the highway's wildlife crossing structures on Banff National Park bear populations, it was all in a day's work, Sawaya said.
"We spent a ton of time in the backcountry and had a lot of really great days out there," said Sawaya, a 2012 graduate of MSU. "Fortunately we never had any really scary experiences. But seeing those particular bears, thankfully from a safe distance, did illustrate that the Trans-Canada Highway wildlife crossings allow safe access to that low-elevation Bow River habitat."
Sawaya said roads are the most common form of man-made disruption to wildlife habitat and, in the case of the Trans-Canada Highway, pose a direct threat to a threatened Alberta grizzly bear population. The study of how bears use wildlife crossings was part of Sawaya's doctoral work, for which he teamed up with Alberta-based wildlife biologist Clevenger, a senior research scientist at WTI, and Kalinowski, an associate professor of ecology at MSU who was Sawaya's adviser.
The 25 wildlife crossings in Banff were installed during the 1990s, to keep motorists and wildlife safe. Two of the crossings are overpasses built with enough width and vegetation to resemble the surrounding forest. The rest of the structures are culverts or bridges. The crossings work in conjunction with high fencing installed along the roadway to keep wildlife out of a stream of traffic that brings millions of vehicles to Banff and through the Canadian Rockies. In addition to bears, the crossings have seen documented use by deer, elk and moose, as well as wolves, wolverines, lynx, cougars and a host of other animals.
Last week, coinciding with the Society of Conservation Biology's biennial international conference, Sawaya, Clevenger and Kalinowski published a paper in the journal Conservation Biology detailing what genetic testing on 10,000 hair samples showed about the demographic effect the Banff crossings have on area bear populations.
Their results offered an encouraging assessment that a highway punctuated with 25 different crossings did not fragment the habitat in a way that prevented bears from seeking food, shelter and dispersal areas on either side of the Trans-Canada Highway.
"This is a landmark study because it's the first time anyone has done extensive genetic sampling to address unanswered questions about the use of highway crossings by bears," Clevenger said. "We knew that bears used the crossings, we just didn't know how many, what percentage of each species' population uses them, whether there is a preference by males or females to use crossings, and if there was a gender or species preference for overpasses or underpasses."
Another paper from the study due this fall will break down what ecologists call "gene flow" between bear populations in the Banff ecosystem. That data should help gauge how well the crossing structures perform in allowing different bears to find mates in an ecosystem bisected by a major highway.
"By collecting the genetic data on each bear using the crossings, we have a much more powerful tool for gauging the effectiveness of the crossing structures to provide connectivity within the ecosystem," Clevenger added.
In 2006, Sawaya, Clevenger and Kalinowski began setting out noninvasive hair snags strands of barbed wire strung across the wildlife crossings, hair traps with wire snags that collect samples from bears lured to a scent and rub trees with wire attached. Over the next three years, the MSU scientists and assistants collected hair samples from 20 crossings, 420 hair traps and 497 dispersed rub trees.
Once the genetic testing was finished, Sawaya said they could identify 15 individual grizzly bears and 17 individual black bears that used the highway crossings over the three years, which Sawaya said paints a good picture of the demographic connectivity provided by the crossing structures. During the study, close to 20 percent of the grizzly and black bears in Banff used the crossings. Grizzlies were more likely to use the overpasses, while black bears were more likely to use underpasses.
Sawaya said research shows that movement of more than 10 percent of a population through the highway barrier signals there is sufficient connectivity to maintain a healthy ecosystem for bears and other large mammals.
Clevenger, who has been tracking the numbers of bear crossings on the Trans-Canada Highway crossing structures for over a decade as part of the Banff Wildlife Crossings Project, said the study's findings are a breakthrough.
"This is confirmation of what our previous investigations have suggested but couldn't confirm," Clevenger said. "We were pretty certain that the numbers of bears using the crossings had steadily increased. Now we know."
The use of wildlife crossings to protect motorists and wildlife on the Trans-Canada Highway in Banff has been a model for similar projects elsewhere. WTI has been consulting on proposed projects with similar goals in countries around the world, from Mongolia, to China, to Brazil.
In Montana, where U.S. Highway 93 runs through the southern Flathead Valley, it runs near prime grizzly bear habitat in the Mission Mountains and the Bob Marshall Wilderness complex. At the request of the Confederated Salish and Kootenai Tribes, the Montana Department of Transportation installed more than 40 wildlife crossings on the Flathead Reservation.
WTI is researching wildlife habits at those crossings also to assess their success in improving habitat. The multiyear study is set to run through 2015, according to Rob Ament, manager of WTI's Road Ecology Program.
Ament said the research WTI scientists are doing in Banff and on the Flathead Reservation is a fundamental part of its mission to provide solutions to transportation problems in the rural West, where wildlife and wildlife-vehicle collision are a common occurrence.
"Between Banff and the U.S. 93 project, we're talking about the two largest wildlife mitigation projects for highways in North America, if not the world," Ament said. "The lessons we learn will be shared with transportation practitioners not only here in the United States but also with those around the globe."
###
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Source: http://www.eurekalert.org/pub_releases/2013-08/msu-msu080213.php
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Russia opposition leader freed on bail, protests rattle Kremlin
By Gabriela Baczynska
KIROV, Russia (Reuters) - Russia unexpectedly freed opposition leader Alexei Navalny on bail on Friday, bending to the will of thousands of protesters who denounced his five-year jail sentence as a crude attempt by President Vladimir Putin to silence him.
Putin's spokesman called the protesters "mobs" and warned that the rallies were illegal.
In a highly unusual ruling that points to Kremlin uncertainty over how to handle Navalny's case, a judge approved the prosecution request to free him pending his appeal so that he can run in a Moscow mayor election on September 8.
The anti-corruption blogger will be unable to leave Moscow but hailed the decision, a day after he was convicted of theft, as a victory for people power.
Experts said it was unprecedented for the prosecution to seek bail on such terms after sentencing.
"I am very grateful to all the people who supported us, all the people who went to (protest in Moscow's) Manezh Square and other squares," the 37-year-old said, rushing across the court to hug his wife after he was let out of a glass courtroom cage.
The judge's decision was greeted by applause in the court in Kirov, 900 km (550 miles) northeast of Moscow. Under Russian law, he has 10 days to file an appeal and then the court has to decide whether to hear that appeal in 30 days.
"We understand perfectly well what has happened now. It's an absolutely unique phenomenon in Russian justice," Navalny said.
People poured onto the streets of Russian cities to protest on Thursday evening after Navalny was convicted of stealing at least 16 million roubles ($494,000) from a timber firm when he was advising the Kirov regional governor in 2009.
More than 200 people were detained although the rallies were peaceful, with demonstrators chanting "Shame!", "Freedom!" and "Putin is a thief!"
In Moscow, drivers honked their horns in support as they drove past at least 3,000 demonstrators a few hundred meters from the Kremlin's red brick walls.
Navalny says his trial was politically motivated and intended to sideline him as a threat to Putin, even though his support is limited outside the cities and opinion polls show the president is still Russia's most popular politician.
Putin has not commented on the verdict against Navalny or his release from custody. Putin's spokesman, Dmitry Peskov, said the rallies were illegal because they were held without approval from the authorities.
"There is no doubt that it is impossible to condone such mobs, and one can only hope that in the future everything will be done within the framework of the law," Peskov told reporters.
The trial was a matter for the courts "and has nothing to do with the president," he said.
KREMLIN CONCERN
Navalny led anti-Putin protests in Moscow which attracted tens of thousands of people at their peak last year. But they did not take off in the provinces, Putin's traditional power base, and faded after the former KGB spy was elected to a six-year third term as president in March 2012.
The sight of protesters so close to the heart of power on Thursday may have unsettled the Kremlin, and Friday's bail decision could be a political maneuver to head off new protests that would worry investors.
The judge ruled that keeping him in detention put "him on an unequal footing against other candidates (in the mayoral election) and restricts his right to be elected".
The current mayor, Sergei Sobyanin, a close Putin ally, said he would prefer to be challenged by Navalny, who opinion polls show is trailing him by a long way.
A source close to the mayor said Sobyanin, who is tipped as a potential prime minister, was worried the removal of Navalny as a candidate would tarnish his expected victory.
Some analysts said the Kremlin, and the business and security community around it, looked divided over Navalny.
"There really is a split in the elite and it seems there will be no peaceful outcome," said political scientist Ella Paneyakh, who described the bail request by the state prosecution as unprecedented.
SPLITS IN THE KREMLIN?
Putin is under no immediate political threat from Navalny, or any other opposition figure, but his grip on power has long depended on maintaining calm and a balance of forces between the conservatives and more liberal forces around him.
Cracks in the facade of unity have appeared, particularly over the removal from government of Vladislav Surkov, Putin's former political strategist, in May. Surkov had fallen foul of more hawkish Kremlin allies who are in the ascendancy as Putin takes a tough line against opponents after last year's protests.
"I think the split at the top of the Kremlin pyramid has now become absolutely obvious," said Alexei Roshchin, a veteran campaign adviser and sociologist.
"Before our very eyes the Navalny case is acting as a catalyst for the split in the elites."
Members of the Kremlin human rights council on Friday supported calls for an independent review of the case against Navalny, the Interfax news agency cited the advisory body's head, Mikhail Fedotov, as saying.
The United States and European Union voiced concern over Navalny's conviction, saying it raised questions about the rule of law and Russia's treatment of Putin's opponents.
"The fact that they were released under specific conditions is something that we can welcome, but how the whole case has been handled simply underlines our concerns," a spokeswoman for EU foreign policy chief Catherine Ashton said.
While it makes it easier for him to stay in the mayoral race, there is no indication Navalny's release from custody will affect the court's ruling on his planned appeal.
The acquittal rate in Russia is about half a percent, or one in 200, and has declined in recent years, said Pavel Chikov, a human rights lawyer and head of legal rights group Agora.
(Additional reporting by Alexei Anishchuk, Denis Dyomkin, Maria Tsvetkova and Steve Gutterman, Writing by Timothy Heritage, Editing by Elizabeth Piper and Angus MacSwan)
Source: http://news.yahoo.com/russian-opposition-leader-freed-temporarily-await-appeal-071359018.html
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