|The swelling around the kidneys & the muscle hemorrhages shown here|
are typical of pigs with African swine fever. Karen Apicelli - USDA.
Thursday, 13 June 2019
More research on African swine fever is urgently needed: No cure, no vaccine and no treatment yet exists for this lethal pig disease
African swine fever is a highly contagious viral disease affecting domestic and wild pigs. It kills nearly 100% of the pigs it infects. The good news is that the African swine fever virus does not infect or harm humans. The bad news is that it devastates household and national economies. Particularly in Africa and now in China and Vietnam, it can destroy the livelihoods. More here.
An Alberta wildfire specialist links Fort Mac "megafire" and BC's 2017 fire season to climate change
The Energy Mix
Wednesday, 12 June 2019
Remote lakes in New Brunswick, Canada, remain dangerously polluted, half-a-century after being drenched with the insecticide, DDT, says study.
It's no secret that the now-infamous bug-killer, DDT,
persists stubbornly in the environment. Still, what scientists found in lake sediments they recently analyzed in the Atlantic province, 50 years after it was last used there, shocked them. The sediment in all five lakes they tested (representing numerous watersheds), were laced with DDT at levels up to 450 times beyond what would be considered safe for key aquatic species and even entire food webs.
by Larry Powell
In some ways, it was like a real war.
A plane sprays DDT on bud worms in Oregon, 1955.
Photo by Forest Health Protection.
In the early fifties, governments and the forest industry teamed up in New Brunswick to launch a massive aerial assault against spruce bud worms.
The pests had probably been eating their way through conifer stands in eastern Canada and the U.S. for thousands of years. But now, they were causing hundreds of millions of dollars of damage yearly to forests of mostly spruce and fir, highly valued by a growing human population.
By 1968, almost six million kilograms of DDT had been unleashed on the worms. The area treated, varied widely from year to year - from about 80 thousand hectares to two million. Some years, the same area was treated once - others, twice.
“Budworm City,” established in the early 1950s and used
as a base for DDT spray operations in northern
New Brunswick. Photo credit: D.C. Anderson.
But not before copious amounts had washed off the land and settled into the water directly from the air.
But this latest research builds even further on what was known back then.
Populations of a small water flea, Daphnia sp. (below) were found to have gone down significantly in the lakes tested. While such a creature may not sound impressive, it's considered an important invertebrate in the food webs of lakes.
L. to r. Environmental Scientist and lead author Dr Josh Kurek,
study co-author Sarah Veinot, field assistant Marley Caddell, and study
co-author Paul MacKeigan at a remote New Brunswick lake.
The study's lead author, Dr. Joshua Kurek, tells PinP, "Just to be clear, the loss/reduction of Daphnia is a concern, as Daphnia eat algae and are also food for fish. Fewer Daphnia mean less food for fish (and other organisms). It also means less grazing pressure on algae. It's very difficult to quantify. But other studies do show more algae (and blooms of algae), when Daphnia are fewer in lakes."
Excessive growth of sometimes toxic algae can clog lakes, robbing them of their oxygen and killing fish. It has become a huge problem in waterways, worldwide.
Because New Brunswick had likely become the most heavily-sprayed forested region on the continent, DDT's harmful legacy could well be playing out well beyond the five lakes that were studied. (There are about 2,500 in the province, in all.)
Another co-author, Dr. Karen Kidd of McMaster University, adds a cautionary note of her own. "The lesson from our study is that pesticide use can result in persistent and permanent changes in aquatic environments."
The project was conducted by experts from three Canadian Universities; Mount Allison, New Brunswick and McMaster. Its findings were published today in the journal,Environmental Science & Technology.
DDT's "rap sheet" is a long one.
Rachel Carson's famous book, "Silent Spring," published in the early 60s, dedicates almost an entire chapter (l.) to the New Brunswick experience. Called "Rivers of Death," it documents the loss of countless fish, insects and birds along the Mirimachi River, one of North America's best salmon-fishing spots, in the wake of the spraying. She noted the pilots made no effort to avoid spraying directly over waterways. She also observed that the spraying was having questionable results, in any event, since the amounts applied kept having to be increased, just to keep ahead of the hungry worms.
Also, years ago, DDT was found to cause a thinning of the eggshells of dozens of bird species, leading to reproductive failure. While their numbers have since recovered, raptors, notably the bald eagle, were especially hard hit.
|A swift, as depicted in|
Bird Craft - 1897.
- Read another version here.
- New Studies Show Farm Chemicals Are Affecting More Than Bees. Bird Populations are Declining, Too. Is modern agriculture's hold on nature becoming a death grip?
- Research Suggests Our Past, Prolific Use of the Insecticide DDT May Still Be Contributing To A Scourge Of Modern-Day Diseases Related To Obesity.
Tuesday, 11 June 2019
Researchers call the results “frightening” because it’s likely “gross underestimate” and the problem is probably much worse. Story here.
Saturday, 8 June 2019
|A forest in Maritime Canada. A PinP photo.|
With age, forests in eastern US and Canada become less vulnerable to climate change, study finds. Story here.
Tuesday, 4 June 2019
|Drivers near Ponoka, Alberta face smoke from wildfires burning further north. |
2019 photo by TaqaSanPedroAko.
"The world is currently completely unprepared to envisage, and even less deal with, the consequences of catastrophic climate change." More here.
|Drift ice in the Arctic ocean. Wickimedia commons.|
Over the last 40 years, Arctic sea ice thickness, extent and volume have declined dramatically. Now, a new study finds a link between declining sea ice coverage in parts of the Canadian Arctic and an increasing incidence of summer heat waves across the southern United States. Story here.
This animation shows the sheet rapidly receding, losing almost half its mass. https://twitter.com/ECCC_CIS/status/1290740808170307584?s=2...
The dollar cost to Manitobans of a deadly hog disease is being revealed. Yet key details regarding its magnitude remain secret. A Planet in Peril (PinP) exclusive.by Larry Powell Manitoba taxpayers have paid out well over 800 thousand dollars to help hog producers battle “Porcine Epidemic Diarrhea,...
Manitoba's Decker Hutterite Colony says, several dead hogs spotted recently on a public roadway, nearby, died of natural causes.by Larry Powell Hog carcasses in two dumpsters on a side road near the Decker Colony, northwest of Brandon, Apr. 24th. I spott...
Some Canadian hog producers are euthanizing their own pigs because Covid-19 has rendered them almost worthless. Is it happening in Manitoba, too?by Larry Powell According to the farm newspaper, the Western Producer, some Canadian producers are killing their own hog stocks an...