The New York Times, March 17, 2014

Link

Signy Island, which lies 375 miles off Antarctica, has too harsh an environment to support a single tree. Its mountains are girdled instead by banks of moss.

“It’s just like a big, green, spongy expanse,” said Peter Convey, an ecologist at the British Antarctic Survey who has worked on Signy Island for 25 years.

Only the top inch of the moss banks is growing. The lack of sunlight turns the older moss brown, and eventually it becomes permanently frozen. Blankets of permafrost have grown on the island for thousands of years, since the glaciers retreated at the end of the last ice age.

Continue reading “A Growth Spurt at 1,500 Years Old”

 

Tattoo by Dave Kotinsley, Gainesville, FL

Jacob Landis writes, “I’m a graduate student at the University of Florida studying flower evolutionary development with a focus on plant/pollinator interactions. My ink represents the concept that I have been working on for almost 6 years now. This piece shows three species in the Phlox family. The red and white flowers are both part of the genus Ipomopsis and the blue/purple flower is in the closely related Polemonium. The pollinator of each flower is shown interacting with the flower. These interactions represent the concept of pollinator syndromes: certain features of the flower will attract certain pollinators. The long red tubular flowers attract hummingbirds, the white tubular flowers attract hawk moths, and the more open blue/purple flowers often attract bees.”

You can see the rest of the Science Tattoo Emporium here or in my book, Science Ink: Tattoos of the Science Obsessed(The paperback edition comes out in May; you can pre-order here.) Continue reading “The Birds And the Bees and the Pollinator Syndrome [Science Ink Sunday]”

Life changes its surroundings. Beavers build dams that alter the course of rivers. Forests can feed thunderstorms with their moisture. And those changes can, in turn, create new habitats that allow for the evolution of new kinds of life. For my new “Matter” column in the New York Times, I discuss a hypothesis about a truly global act of bio-engineering that may have happened 700 million years ago. Sponges may have transformed the oceans, flushing them with oxygen. And thanks to that change, more complex animals were able to evolve. We may have sponges to thank for being here, in other words. You can read the whole thing here. Continue reading “Sponges: Planetary Engineers?”

The New York Times, March 13, 2014

Link

If Tim Lenton is right, we all owe sponges a deep debt of gratitude. It may be hard to give much credit to these simple animals, which spend their uneventful lives on the sea floor trapping floating bits of food. But Dr. Lenton, an earth systems scientist at the University of Exeter, suspects that sponges played a crucial role in the rise of the animal kingdom.

Some 700 million years ago, he and his colleagues argue, sponges re-engineered the planet. The sponges unleashed a flood of oxygen into the ocean, which before then had scarcely any oxygen at all. Without that transformation, we might not be on earth today.

Continue reading “Take a Breath and Thank a Sponge”

 

Killer whales. Wikipedia/Robert Pitman en.wikipedia.org/wiki/File:Killerwhales_jumping.jpg

The challenge–and the pleasure–that evolutionary biologists face in their work is deciphering the history of nature, no matter how weird it gets. And nature doesn’t get much weirder than a beluga whale singing through its nose to see the ocean. Continue reading “Seeing the Ocean With A Buzzing Nose”