Sea urchins climb onto kelp when their densities are so high they remove all drift kelp and then actively forage on attached, living kelp. (Credit: Steve Lonhart / NOAA MBNMS) Tipping points are the ...

For decades, ecologists have puzzled over a mystery: Why do some natural habitats get overrun by invasive species while others seem to repel outside threats? In a classic 1958 book on the subject, the ...

If you liked this story, share it with other people. The forests of northern Europe provided Tim Christophersen with his first education. As a child in rural Germany he followed his grandfather, a ...

By eating what no one else can, zebras expand the land’s capacity for life, making them foundational drivers of ecosystem ...