Mayfly numbers drop by half.

Mayfly numbers drop by half since 2012, threatening food chain
Mayflies, which form swarms in the billions that are visible on weather radar, are in steep decline, mirroring the plight of insects worldwide.

BY DOUGLAS MAIN

PUBLISHED JANUARY 20, 2020

Every summer, mayflies burst forth from lakes and rivers, taking to the skies of North America. These insects, which are particularly abundant in the northern Mississippi River Basin and Great Lakes, live in the water as nymphs before transforming into flying adults. They synchronize their emergence to form huge swarms of up to 80 billion individuals—so massive that, in waterside towns, they are sometimes scooped up with snowplows.

Elwah Dam Removal Success

Published on Jun 2, 2016

June 2, 2016 - Conservationists can now point to the largest dam removal project in the U.S. as a success story. The ecosystem of Washington's Elwha River has been thriving since the removal of its hydroelectric dam system. Recent surveys show dramatic recovery, especially in the near shore at the river's mouth, where the flow of sediment has created favorable habitat for the salmon population. A new generation of salmon species, some of which are endangered, are now present in the river. Some hope that the restoration of the Elwha River will become a shining example for the removal of dams across the U.S.

Read "River Revives After Largest Dam Removal in U.S. History."
http://news.nationalgeographic.com/20...

Check out salmon photos on National Geographic Your Shot.
http://yourshot.nationalgeographic.co...

Learn more about the largest dam removal in U.S. history.
http://news.nationalgeographic.com/ne...