Up to 900 tropical bird species could 'go extinct'

Up to 900 species of tropical land birds around the world could become extinct by 2100, researchers say.

The finding is modelled on the effects of a 3.5C Earth surface temperature rise, a Biological Conservation Journal paper shows.

Species may struggle to adapt to habitat loss and extreme weather events, author Cagan Sekercioglu says.

Mountain, coastal, restricted-range, and species unable to get to higher elevations could be the worst affected.

 

Birds at risk:

          

'Jacuzzi vents' model CO2 future

A UK scientist studying volcanic vents in the ocean says they hold a grave warning for future marine ecosystems.

These vents have naturally acidified waters that hint at how our seas might change if atmospheric carbon dioxide levels continue to rise.

They are conditions that would make it harder for corals and similar organisms to make the hard parts in their bodies.

Dr Jason Hall-Spencer's work suggests our oceans could lose perhaps 30% of their biodiversity this century.

The Plymouth University researcher has been presenting his latest findings to a major conference in Vancouver, Canada.

"I am investigating underwater volcanoes where carbon dioxide bubbles up like a Jacuzzi, acidifying large areas of the seabed, and we can see at these vents which types of organisms are able to thrive and which ones are most vulnerable," he told the annual meeting of the American Association for the Advancement of Science (AAAS).