By The Canadian Press - Sunday, January 27, 2013 - 0 Comments
VANCOUVER – The British Columbia government has approved the shooting one species of owl…
VANCOUVER – The British Columbia government has approved the shooting one species of owl in a last-ditch effort to save their endangered cousins, as the number of northern spotted owls continues to decline decades after they became the mascot of the “War in the Woods” over old-growth logging.
Northern spotted owls are on the brink of extinction in Canada, with only 10 birds remaining in the wild in southwestern B.C., according to some estimates.
The situation is so grave that over the past five years the provincial Forests and Lands Ministry has relocated 73 and authorized the shooting of 39 barred owls, the larger and more aggressive bird encroaching on the spotted owls’ limited habitat.
“Barred owls have invaded all spotted owl habitat,” said Ian Blackburn, the provincial government’s spotted owl recovery co-ordinator.
Relocation or elimination of barred owls is limited to a five-kilometre radius around areas where spotted owls have recently been confirmed, or areas being considered for reintroduction from a captive breeding program.
“Without this, it is likely that the wild population would be extirpated before we have sufficient captive-bred young to release — which would significantly hurt the chances of survival for the released birds,” Blackburn said in an email.
Preliminary results show that new spotted owls were discovered within nine of 17 sites where barred owl removals occurred, he said.
“While none of us like the idea of killing (barred owls), we all agreed that if the goal continues to be the recovery of the (spotted owl), then it is a necessary and potentially effective tool,” says a 2011 internal email between members of the provincial spotted owls recovery team, obtained by the conservation group the Wilderness Committee using freedom of information legislation.
Due largely to loss of habitat from old-growth logging, spotted owls were already on the brink of extinction by the 1980s when they became the mascot of the environmental movement.
As loggers and protesters clashed in the woods, the wide-eyed bird of prey was listed as endangered by the Committee on the Status of Endangered Wildlife in 1986 and red-listed in B.C. in 1989. A provincial management plan was adopted in 1997, but the province has no stand-alone endangered species legislation that mandates conservation measures.
The province designated special management areas under a 2006 management plan and implemented the first-ever captive breeding program for spotted owls.
Blackburn said the program appears to be helping the few remaining birds in the wild.
“If we can succeed with captive-breeding, we have a shot,” he said in an email.
“The long-term hope is that if we create sufficient suitable habitat and flood it with captive-bred birds, they may be able to withstand/adapt to the competition from (barred owls).”
Barred owls are more adaptable than spotted owls, and compete for space and prey, according to the federal species at risk listing for the birds. They also prey directly on spotted owls and breed with them to produce a hybrid species.
“They basically push the spotteds out,” said Rob Hope of the Orphaned Wildlife Rehabilitation Centre in Delta, B.C.
“They’re trying to protect what spotteds are left … trying to control where the nesting pairs are to give them a chance.”
Some view the cull as a desperate measure that may be too little, too late.
“This is what happens when you drive a species right to the edge of extinction and you don’t want to do the right thing, which is put aside the habitat it needs to recover,” said Gwen Barlee of the Wilderness Committee.
The northern spotted owl can be found along the Pacific coast from Mexico to Washington state, but in Canada, it is found only in southwestern B.C. A century ago, there were an estimated 500 breeding pairs in B.C.
“Without increased habitat protection and direct augmentation of the population, the caurina subspecies of the spotted owl cannot avoid being extirpated; if present trends continue, extirpation will occur by 2012,” said the SARA listing.
Yet Blackburn remains hopeful that owls can be brought back.
Some 300,000 hectares have been designated protected spotted owl habitat, and a captive breeding program is creating a population that can be released back into the wild — possibly starting this year.
There are 13 owls in the captive breeding program at the Mountain View facility in Langley, B.C., where Blackburn said three incubated eggs successfully hatched.
“Unfortunately, only one chick survived,” Blackburn said. “He has since been paired with a potential mate for breeding this year.”
There are two more owls in a captive breeding program at the Woodland Park Zoo in Seattle.
“The captive breeding program hasn’t been very successful,” Barlee said, adding that internal documents obtained by the Wilderness Committee indicated three out 10 owls captured for the program died in captivity.
The No. 1 reason for their state is loss of old-growth habitat, and releasing captive-bred birds back into unsustainable habitat is futile, she said.
Documents obtained by the Wilderness Committee repeatedly mention that much of the land the government set aside and protected from logging — to much fanfare — was not suitable terrain for the owls, but Blackburn said habitat “is slowly increasing in total suitability.”
Barlee fears it’s too late — for the spotted owl and other species.
“It’s kind of scary because in 20 years we might look back and say, ‘What happened?’ We had something that was the envy of the world … and because of short-term thinking and short-term economic growth over a healthy environment, we’ve lost something very special.”
By Kate Lunau - Wednesday, May 4, 2011 at 12:10 PM - 5 Comments
In Australia, some species are too expensive to protect
The northern hairy-nosed wombat, a burrowing marsupial native to Australia, is a critically endangered species—but according to Australian researchers, it may not be worth saving. A team from the University of Adelaide and James Cook University has developed a new index, called Species Ability to Forestall Extinction (SAFE), that takes current and minimum viable population sizes into account to determine if it’s just too expensive to save a particular animal. “SAFE is the best predictor yet of the vulnerability of mammal species to extinction,” says Corey Bradshaw, director of ecological modelling at Adelaide’s Environment Institute. Not all critically endangered species “are equal,” he says.
The northern hairy-nosed wombat might be a loser in this equation, but other species win. Based on this formula, conservationists should prioritize the Sumatran instead of the Javan rhinoceros, Bradshaw suggests: “The Sumatran rhino is more likely to be brought back from the brink of extinction based on its SAFE index.” Efforts to save endangered species are a bit like triage on the battlefield, these researchers argue, in which doctors have to make tough choices about who can, and can’t, be saved.
By Nicholas Köhler - Wednesday, February 16, 2011 at 9:52 AM - 2 Comments
An unusual export from Canada ends a 10,000-year bison drought
In the spring of 2006, wildlife biologists with the Canadian government loaded 30 wood bison calves, 15 males and 15 females, into three modified horse trailers and drove them from Elk Island National Park, in Alberta, to Edmonton International Airport an hour away. There they watched as a crane extended from the bowels of an Ilyushin Il-76, the Russian counterpart to the Lockheed Hercules, and collected the trailers one by one from the tarmac. During the 15-hour flight that followed, the Il-76 was kept a cool 10° C; wood bison grow uncomfortable in heat.
When they reached Yakutsk, capital of the Republic of Sakha—located in northeast Siberia and also called Yakutia—then-president Vyacheslav Shtyrov greeted the wood bison with a retinue of ministers. Alongside him, a crowd of some 200 Yakutians, many in traditional garb, performed dances and serenaded the herd with toyuk—a blessing song. To the visiting Canadians they offered raw horse liver and wood goblets filled with kumis, an alcoholic beverage made from fermented mare’s milk. Sakha newspapers later delighted in running photographs of one Canadian, mid-sip, visibly distressed by the taste of the milk.
Despite the pomp, few in Sakha had ever seen bison, which haven’t lived in Siberia since the steppe bison, an animal twice the wood bison’s size, died out 10,000 years ago. If the Yakutians celebrated the herd’s arrival, Parks Canada employees simply fretted over the transfer. Wood bison, at upwards of 900 kg, are the largest land mammal in North America, and are classified as a threatened species. Yet, five years on, their foray into Siberia has proven a success: the animals, who live on a wildlife preserve, began reproducing a year after their arrival, earlier than expected, and have grown larger than their Alberta cousins thanks, it’s thought, to the Sakha cold.
By Tom Henheffer - Thursday, August 26, 2010 at 2:20 PM - 0 Comments
Canadian birds are about to fly south for the winter, thousands won’t be returning
Canadian birds are about to fly south for the winter, but thanks to the oil slick contaminating their temporary home along the Gulf of Mexico, thousands won’t be returning.
Although oil has stopped leaking from BP’s underwater Gulf pipeline, more than 1,000 km of coast and almost 20,000 acres of inland marsh have been contaminated with toxic hydrocarbons, and those numbers are expected to increase as hurricane season churns up submerged crude and spreads the greasy sheen covering wetlands. It’s a mess that’s already decimated local wildlife populations, and is now lying in wait for tens of millions of unwitting Canadian ducks, geese and other birds—including endangered white pelicans and piping plovers.
By Tom Henheffer - Thursday, July 29, 2010 at 9:40 AM - 0 Comments
Otters: Cute, and useful
Sea otters, arguably the world’s cutest endangered species, have also turned out to be one of Mother Nature’s best animal carbon sinks. It’s believed they can pull up to 0.18 kg of C02 out of the air for every square metre of water they occupy, by keeping kelp beds healthy.
They’re only at about a third of what their population once was, but if their numbers were back to the estimated 300,000 before they were hunted to near extinction in the 18th and 19th centuries, they would be responsible for the sequestration of about 10 billion kg of carbon dioxide a year.