Global warming leaves Thames facing attack of the alien crabs

Non-native flora and fauna encouraged by climate change could cause the river Thames's ecosystem to collapse, a report by charity WWF warns today.

The Thames Vulnerability Assessment Report predicts a decline in native plants and animals as well as a drop in fish levels.

Researchers say Chinese mitten crabs, zebra mussels and Asiatic clams are the biggest threats.

The report also says the lush green landscape along parts of the Thames will become arid and dusty, although there will be a huge increase in f loods.

Dr Tom Le Quesne, WWF UK freshwater policy adviser, said: "The Government needs to develop policies that can address droughts, floods, pollution and climate change simultaneously, rather than treating each in isolation."