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Loss of Arctic Sea Ice Eliminates Major Barrier for Parasites in Marine Mammals
By Tim Radford
The great Arctic thaw—up to 50 percent of sea ice by area and 75 percent by volume in the summer season—could be offering new opportunities for one of the planet’s most successful parasites. Toxoplasma gondii, an infection spread by almost all cat species, has been identified for the first time in the western Arctic Beluga whale.
Toxoplasma is found almost everywhere that cats settle: domestic pets, ocelots, cougar, wild cats all carry and spread oocysts of the parasite (structures it uses to transfer to new hosts) in their feces, to be spread further with discarded cat litter.
The parasite is notoriously hard to kill. Scientists store their samples in sulphuric acid, and the creature can survive unharmed in bleach. It is, however, routinely killed by freezing conditions, or boiling water.
The suspicion is that with the steady, sustained warming of the Arctic over the past 30 years, chiefly because of a buildup of carbon dioxide in the atmosphere, the retreat of the ice has begun to allow new traffic in parasite infections.
Another parasitic killer, a new strain called Sarcocystis pinnipedi, normally found only in the highest, iciest latitudes, has been linked with mass deaths too—406 grey seals died in 2012 in the north Atlantic. It has also been observed to kill Steller’s sea lions, Hawaiian monk seals, walruses, grizzly bears and polar bears as far south as British Columbia.
In the case of Toxoplasma, warming polar summers could have created conditions in which the parasite could find new warm-blooded hosts further north. In the case of the second parasite, the loss of ice has meant a greater mixing of species, and allowed Sarcocystis to find new hosts in warmer waters.
“Ice is a major barrier for pathogens,” Michael Grigg, of the U.S. National Institutes of Health told the American Association for the Advancement of Science annual meeting here. “What we are seeing with the big thaw is the liberation of pathogens gaining access to vulnerable new hosts and wreaking havoc.”
Toxoplasma can also infect people: it is the leading cause of infectious blindness in humans, and can be dangerous to unborn children and to people with compromised immunity.
It has been found in human communities in northern Quebec, perhaps spread by the consumption of dried seal meat. The discovery of Toxoplasma in Beluga whales has begun to worry health officials. Belugas are part of the traditional diet of the Inuit hunters of the far North.
Seals, walruses and polar bears are all what scientists like to call “ice obligate animals”: the ice sheet provides them with their preferred habitat. With the loss of the ice, new species are colonizing the Arctic, and those creatures that cannot now use the ice sheet have been forced to invade new habitats.
“Marine mammals can act as ecosystem sentinels because they respond to climate change through shifts in distribution, timing of their movements and feeding locations,” said Sue Moore of the U.S. National Oceanic and Atmospheric Administration. “These long-lived mammals also reflect changes to the ecosystem in their shifts in diet, body condition and physical health.”
EcoWatch Daily Newsletter
By Derrick Z. Jackson
As much as hurricanes Katrina and Maria upended African American and Latinx families, the landfall of the coronavirus brings a gale of another order. This Category 5 of infectious disease packs the power to level communities already battered from environmental, economic, and health injustice. If response and relief efforts fail to adequately factor in existing disparities, the current pandemic threatens a knockout punch to the American Dream.
'We Need People's Bailout, Not Polluters' Bailout': Climate Groups Move to Preempt Big Oil Giveaway Amid Pandemic
By Andrea Germanos
A coalition of climate organizations strongly criticized President Donald Trump's in-person Friday meeting with the chief executives of some of the biggest fossil fuel companies in the world, saying the industry that fueled climate disaster must not be allowed to profiteer from government giveaways by getting bailout funds or preferred treatment during the coronavirus pandemic.
An Important Note
No supplement, diet, or lifestyle modification — aside from social distancing and practicing proper hygiene — can protect you from developing COVID-19.
The strategies outlined below may boost your immune health, but they don't protect specifically against COVID-19.
By Zak Smith
It is pretty amazing that in this moment when the COVID-19 outbreak has much of the country holed up in their homes binging Netflix, the most watched show in America over the last few weeks has been focused on wildlife trade — which scientists believe is the source of the COVID-19 pandemic. Make no mistake: Tiger King: Murder, Mayhem and Madness is about wildlife trade and other aspects of wildlife exploitation, just as surely as the appearance of Ebola, SARS, MERS, avian flu and probably COVID-19 in humans is a result of wildlife exploitation. As a conservationist, this is one of the things I've been thinking about while watching Tiger King. Here are five more:
By Hector Chapa
With the coronavirus pandemic quickly spreading, U.S. health officials have changed their advice on face masks and now recommend people wear cloth masks in public areas where social distancing can be difficult, such as grocery stores.
But can these masks be effective?