Coral reef growth is slowest ever

Coral growth in Australia’s Great Barrier Reef has slowed to its most sluggish rate in the past 400 years.

The decline endangers the species the reef supports, say researchers from the Australian Institute of Marine Science.

They studied massive porites corals, which are several hundred years old, and found that calcification has declined by 13.3% since 1990.

Global warming and the increasing acidity of seawater are to blame, they write in Science journal.

BBC

Coral reefs are central to the formation and function of ecosystems and food webs for tens of thousands of other marine organisms.

The Great Barrier Reef is the largest in the world, composed of over 2,900 individual reefs and 900 islands.

Dr Glenn De’ath and colleagues investigated 328 colonies of massive Porites corals, from 69 locations.

The largest corals are centuries old – growing at a rate of just 1.5cm per year.

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http://news.bbc.co.uk/2/hi/science/
nature/7807943.stm