invasive species

Jellyfish invaders: Trondheim Fjord in transition

Jarle Mork has spent the last 40 years of his career studying Trondheim Fjord and its finned inhabitants. Warmer waters and the arrival of new creatures are bad news for the fjord’s cod population, he says. But other fishing practices are problematic, too.

Beautiful, but blacklisted

If you have this beautiful flower in your garden, you should uproot it before the seed pods explode, releasing thousands of seeds. It spreads like the black plague.