From the New Scientist via Huffington Post“Huge crabs more than a metre across have invaded the Antarctic abyss, wiped out the local wildlife and now threaten to ruin ecosystems that have evolved over 14 million years.”
These critters occupy a layer between 1400 and 950 metres deep, where the water is a little warmer. Further up the water is cooled by melting ice.
Global warming seems to be the culprit. Back in 1982 the minimum temperature there was 1.2°C, too cold for king crabs. Last year it had risen to a balmy 1.47°C, enough for the crabs to thrive.