All in Animals

Kirstin Meyer-Kaiser: Digging up DNA from the depths

The Missing in Action Recovery and Identification Project is a collaborative effort spanning multiple disciplines of genetics, marine biology and archaeology, hoping to use eDNA to locate the remains of military service personnel. Dr Sally Le Page sits down with Dr Kirstin Meyer-Kaiser, a marine biologist at Woods Hole Oceanographic Institution, and one of the leads on this project to find out more.

The greatest shoal on Earth

Popularly known as the “greatest shoal on Earth”, the KwaZulu-Natal sardine run involves tens to hundreds of millions of Pacific sardines packed into high density shoals to make the annual trip from the coast of South Africa to spend the winter in the Indian Ocean.

For sheer size and spectacle, this marine migration is no less impressive than the wildebeests on terra firma. But unlike the Serengeti herds, which migrate in search of food, the underlying reason for the sardine run is much less clear.

On the wing: genetic compasses

Every year, tiny songbirds - some weighing as little as 3 grams - set off on an incredible journey. Often travelling alone and at night, they fly as much as 15,000km between their winter and summer homes, yet somehow manage to return to the same location every year. But how do these birds know where to go?

EPAS1: The mountain gene

Tibetans have lived in the thin mountain air for more than 6,000 years thanks to a gene variant they originally inherited from the ancient Denisovans. The thin air has favoured the persistence of one particular version of a gene called EPAS1, which allows these mountain-dwellers to get along just fine despite the shortage of oxygen. But it’s not only high-altitude humans who have traces of ancestral ‘ghosts’ in their DNA, it’s their pets too.

Tarang Mehta: super fish for fish suppers

Across the world, over 3 billion people, or nearly half the global population, rely on fish as a significant source of animal protein, and since 2012, more of our fish has come from aquaculture or fish farms rather than catching wild fish. Dr Tarang Mehta is a molecular evolution scientist at the Earlham Institute who has been looking at future-proofing one group of fishes in particular, tilapia, which is already a hugely important fish for people around the world.