Canada: Effects of 50-year-old DDT spraying program still present in remote lakes of province - PressFrom - Canada
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CanadaEffects of 50-year-old DDT spraying program still present in remote lakes of province

15:00  12 june  2019
15:00  12 june  2019 Source:   cbc.ca

Decades later, DDT still poisoning Canadian lakes

Decades later, DDT still poisoning Canadian lakes The harmful chemicals are still having an effect long after being banned.

Dichloro-diphenyl-trichloroethane ( DDT ) has been administered in indoor residual spraying as part of the KwaZulu-Natal Province ’s malaria control program for several years . Toxicity of this pesticide has been demonstrated in many avian and mammalian species.

Environmental Effects of DDT : This volume explores how the scientific tools of ecology can be used Environmental Effects of DDT Dichlorodiphenyltrichloroethane, better known as DDT , was a potent DDT is not equally toxic to all species of animals. Control programs for arthropods have sometimes

Effects of 50-year-old DDT spraying program still present in remote lakes of province © Tori Weldon/CBC Josh Kurek is lead author of the study that shows the legacy effects of DDT spraying in New Brunswick.

More than 50 years after New Brunswick stopped  spraying DDT to kill the spruce budworm, researchers have found "concerning" levels of the banned pesticide in five remote lakes in north-central New Brunswick.

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Отмена. Месяц бесплатно. DDT Spraying on children. TangstarScience. DDT pesticide linked to Alzheimer's risk - Продолжительность: 1:07 CBSN 893 просмотра. Changing "deviant" behavior -- 50 s-60s - Продолжительность: 1:44 Bite-Size Random 669 530 просмотров.

Montrose ceased manufacture of DDT in 1983, ten years after it was banned in the United States. The EPA estimates that between 1942 up to its ban in 1972, approximately 675,000 tons of DDT have been applied or sprayed in the United States.

Mount Allison professor Josh Kurek is lead author of a study that set out to find how the lake ecosystems are recovering,  but the results were not encouraging.

"The levels of DDT are concerning and are at levels that we know that aquatic organisms are harmed."

Kurek and his team took samples from the bottom of five remote lakes, Upsaquitch, California, Sinclair, Goodwin and Middle Peaked Mountain. Each is part of a different watershed in north-central New Brunswick.

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DDT - spraying campaign under the auspices of. UNRRA, the United Nations Relief and. In other studies the magnification rate in specific food chains was measured in the bottom of Lake Evidence of the carcinogenic effects of DDT have multiplied since 1962. Indeed, in the very year following

Ethiopia and South Africa are among the few countries to still implement indoor residual spraying with dichloro-diphenyl-trichloroethane ( DDT ) for malaria vector control. Giesy JP, Feyk LA, Jones PD, Kannan K, Sanderson T (2003) Review of the effects of endocrine-disrupting chemical in birds.

Kurek began the research because he thought it would be a good chance to examine the long-term effects of a chemical like DDT, and the ability of the affected ecosystem to recover.

Effects of 50-year-old DDT spraying program still present in remote lakes of province © Provided by Canadian Broadcasting Corporation

He was looking for "improvements in the organisms that exist in these lakes decades after we stopped using the insecticide."

Kurek said he was surprised to find that while DDT levels detected in the sediment do register a decrease, "modern sediments" or mud currently in contact with the water still has a high concentration of the chemical.

Those concentrations are high enough to affect organisms living in the lakes. One of the reasons Canada banned DDT in  the early 1970s was the chemical's tendency to persist in the environment and accumulate in organisms.

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Health effects of pesticides. From Wikipedia, the free encyclopedia. Some pesticides can remain in the environment for prolonged periods of time. For example, most people in the United States still have detectable levels of DDT in their bodies even though it was banned in the US in 1972.[6].

Indoor residual spraying is the application of long-acting insecticides on the walls and roofs of In the past, India was able to use DDT effectively in indoor residual spraying to cut dramatically the In January of this year , WHO took stringent measures to help prevent future resistance to antimalarial

Kurek said his research suggests that the lakes are now "radically different compared to years before use of DDT."

Budworm City

The report states that at least 5.7 million kg of DDT were sprayed on New Brunswick forests between 1952 and 1968. In comparison, Quebec used less than one million kg during the same time period.

"New Brunswick was ground zero for DDT to fight outbreaks of forest insects," Kurek said.

"These are  some of the highest values in Canada."

A CBC report from 1957 said 220 planes armed with what was then considered a "miraculous" pesticide flew in and out of a remote airbase dubbed "Budworm City".

And while DDT was effective in killing insects, it became clear it also had a devastating effect on birds.

Peregrine falcons died in rapid succession after the increased usage of DDT.

DDT was banned in 1972, a decade after Rachel Carson's Silent Spring sounded alarms about the chemical, but the damage had been done. The peregrine falcon was listed as endangered in 1978.

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tial repellent effect of DDT is obvious from. Evidence that DDT is. chronically present in air was shown recently. by van Dyk et al. malaria control, even if this still requires DDT , and ways and means to reduce exposures. once a year . Nobody wants to expose their. babies to DDT via breast milk as mothers.

We still see the effects of unfettered human intervention through Carson’s eyes: she popularized modern ecology. Though Carson talked about other pesticides, it was DDT — sprayed aerially over large areas of the United States to control mosquitoes and fire ants — that stood in for this excess.

The species was removed from the list nearly four decades later in 2017.

Legacy effect

Kurek said given the sediment levels they measured, there could be a lasting impact on wildlife.

"Other studies show contaminants can move from water to ground relatively easily."

He said small insects, living in fresh water are eaten by birds or frogs, and DDT can be passed from one to the other.

"Organisms that are eating other organisms will simply see more DDT in their fatty tissues."

"If it's still around our fresh waters, in our forest soils, organisms are being exposed to it, it's still kicking around our food web decades after we stopped using it."

Kurek said this study only looked at five lakes, but it's a cautionary tale.

"It's likely hundreds and hundreds  of lakes across our beautifully forested province that probably contain a similar  story."

The study is published in the peer-reviewed journal Environmental Science and Technology of the American Chemical Society.

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