How Beavers Could Help Clean Up Polluted Waters Around the World

iStock.com/milehightraveler
iStock.com/milehightraveler

Beavers are a lot more impressive than you might think. These semiaquatic rodents can build dams as large as 2800 feet deep, thanks in part to their super sharp teeth and sturdy tails that keep them from tipping over while hauling heavy materials into the water. According to research from scientists at the UK-based University of Exeter, the animals could also potentially help clean up polluted waterways.

Professor Richard Brazier and his colleagues studied the water quality at the site of a fenced-in area in southwest England, where a family of captive beavers has been living since 2011. The water flowed from nearby fields to a local river, where it deposited sediment while passing through 13 dams that had been built by the beavers.

The reduced water flow—and the deep ponds that formed as a result of the dams—had a filtering effect. The beavers’ dams captured more than 100 tons of soil and other sediment that contained high levels of nitrogen and phosphorus, both of which are bad for wildlife and human consumption.

The runoff problem is also twofold: The erosion of soil on agricultural land has both economic and environmental consequences. Scientists suggest that the reintroduction of the Eurasian beaver to rivers could help curb some of this damage. These “ecosystem engineers,” as the animals are called in the University of Exeter study, were believed to have been hunted to extinction in Britain by the 1500s. However, a colony was found in Scotland a decade ago, and there have been some efforts since then to release beaver populations into the wild.

"It is of serious concern that we observe such high rates of soil loss from agricultural land, which are well in excess of soil formation rates,” Brazier said in a statement. “However, we are heartened to discover that beaver dams can go a long way to mitigate this soil loss and also trap pollutants which lead to the degradation of our water bodies. Were beaver dams to be commonplace in the landscape we would no doubt see these effects delivering multiple benefits across whole ecosystems, as they do elsewhere around the world."

In a separate study from 2015, scientists at the University of Rhode Island determined that larger beaver ponds were able to remove up to 45 percent of nitrogen in the water that passed through them, while smaller ponds removed roughly 5 percent. The North American beaver was also on the brink of extinction in the 1800s, but these populations have since rebounded in Rhode Island and other parts of the continent.

100 Dachshunds Competed in Cincinnati’s Annual ‘Running of the Wieners’

NORRIE3699/iStock via Getty Images
NORRIE3699/iStock via Getty Images

Every year, to kick off Cincinnati’s Oktoberfest Zinzinnati, 100 dachshunds compete in heats to decide who the fastest dachshund in the Midwest is. This year marks the 43rd annual Oktoberfest—one of the biggest Oktoberfest celebrations outside of Germany (more than 500,000 people attend the three-day event).

On the afternoon of Thursday, September 19, 100 wiener dogs (and their owners and handlers) gathered in downtown Cincinnati for the 2019 "Running of the Wieners." The dogs, dressed in hot dog costumes, ran 10 heats, which lasted 75 feet or five seconds each. The winner of each heat advanced to the final round, where the top three finishers were decided.

Maple, a long-haired, one-year-old dachshund, ran his way into first place—and into our hearts.

Maple’s owner, Jake Sander, told WCPO that Maple is one of five dachshunds in the family, and that he learned to run fast by chasing his brother around. Leo and Bucky, two other doxies, placed second and third, respectively.

Besides the Running of the Wieners, Zinzinnati also hosts the World’s Largest Chicken Dance. However, the wiener dogs are more fun to watch.

Photographer Captures Polka-Dotted Zebra Foal in Kenya

Frank Liu
Frank Liu

Zebras are known for their eye-catching patterns, but this polka-dotted foal recently photographed in Kenya's Masai Mara National Reserve really stands out from the herd. As National Geographic reports, the zebra baby likely has pseudomelanism, a rare pigment condition that's been observed in the wild just a handful of times.

Nature photographer Frank Liu saw the zebra foal while looking for rhinos in the savannah wilderness preserve. After initially confusing the specimen for a different type of animal, he realized upon closer inspection that it was actually a plains zebra born with spots instead of stripes. The newborn foal was named Tira after the Maasai guide Antony Tira who first pointed him out.

Zebra foal with spots walking with mother.
Frank Liu

Zebra foal with spots.
Frank Liu

A typical zebra pattern is the result of pigment cells called melanocytes, which are responsible for the black base coat, and melanin, which gives the animal its white stripes. (So if you've ever wondered if zebras are white with black stripes or black with white stripes, the answer is the latter). In Tira and other zebras with pseudomelanism, the melanocytes are fully expressed, but a genetic mutation causes the melanin to appear as dots rather than unbroken stripes.


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Though rare, this isn't the only time a zebra with pseudomelanism has been documented in nature. Pseudomelanistic zebras have also been spotted in Botswana’s Okavango Delta, but Liu believes this could be the first time one was found in the Masai Mara preserve.

Zebra stripes aren't just for decoration. The distinct pattern may act as camouflage, bug repellant, and a built-in temperature regulation system. Without these evolutionary benefits, Tira has a lower chance of making it to adulthood: Pseudomelanistic zebra adults are rarely observed for this reason. But as Liu's photographs show, the foal has the protection and acceptance of his herd on his side.

[h/t National Geographic]

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