One scientist, who's been studying blue-green algae, says little is known about its affect on wildlife.

When the largest lake in the UK turns green, it’s hard not to wonder about the effect on local wildlife.

Blue-green algae is known to emit toxins which can cause skin irritation in humans, or stomach upsets if a lot of affected water is ingested while swimming, for example.

And it is known to be potentially fatal for dogs.

But “surprisingly,” says one scientist who’s been studying the algae, very little is known about the effect of algae on wildlife.