The Beacon

Blog Tags: Evolution

Whale Wednesday: Going Batty Edition

Bats and toothed whales share the ability to squeak and click their way to prey. And now two new studies in this week’s journal Current Biology reveal that their echolocation, which evolved independently in the two groups, has a similar underlying molecular mechanism.

There are plenty of examples of evolutionary convergence, such as the tusks of elephants and walruses, or the bioluminescence of fireflies and jellyfish.

But it’s highly unusual for convergence to occur at the molecular level. Turns out the inner ear hair cells of both the bottlenose dolphin (a toothed whale) and 10 species of bats contain a protein called prestin, which plays an important role in echolocation.

But not all echolocaters are created equal. Because the speed of sound in water is five times that in air, dolphins can use echolocation for more than 100 meters. Bats can only do so for a few meters. 

(Hat tip to Monterey Bay’s Sea Notes blog for this story.)


Continue reading...

Whale Wednesday: Evolution is Cool Edition

Image via Wikimedia Commons.

Killer whales may be evolving into two separate species in the North Atlantic, says new research out of the UK. (Who knew orcas were common in UK waters, anyway?)

The researchers discovered that the two groups, which they have creatively dubbed "Type 1" and "Type 2" have different wear on their teeth, suggesting different diets and thus different ecological niches. Then, genetic analysis confirmed that the two types of killer whale belong to different populations.

The scientists compared the findings to how Darwin's finches adapted to fill unique ecological roles.

So what does this mean for the future of the North Atlantic killer whales? If Type 1 and Type 2 become separate species, they would require separate conservation monitoring efforts.

And if that happens, hopefully the powers that be will think of some catchier names for them.


Continue reading...


Browse by Date