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More acidic oceans 'will affect all sea life'

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Posted in Science on 23rd Oct, 2017 04:12 PM by Alex Muller

All sea life will be affected because carbon dioxide emissions from modern society are making the oceans more acidic. The study finds that infant sea creatures will be especially harmed. This means the number of baby cod growing to adulthood could fall to a quarter or even a 12th of today's numbers, the researchers suggest.

 

The assessment comes from the BIOACID project, which is led from Germany. A brochure summarising the main outcomes will be presented to climate negotiators at their annual meeting, which this year is taking place in Bonn in November.
 
The Biological Impacts of Ocean Acidification report authors say some creatures may benefit directly from the chemical changes - but even these could still be adversely affected indirectly by shifts in the whole food web.
 
What is more, the research shows that changes through acidification will be made worse by climate change, pollution, coastal development, over-fishing and agricultural fertilisers.
 
Ocean acidification is happening because as CO2 from fossil fuels dissolves in seawater, it produces carbonic acid and this lowers the pH of the water.
 
Since the beginning of the Industrial Revolution, the average pH of global ocean surface waters have fallen from pH 8.2 to 8.1. This represents an increase in acidity of about 26%.
 
The study's lead author is Prof Ulf Riebesell from the GEOMAR Helmholtz Centre for Ocean Research in Kiel.
 
He is a world authority on the topic and has typically communicated cautiously about the effects of acidification.
 
He told BBC News: "Acidification affects marine life across all groups, although to different degrees.
 
"Warm-water corals are generally more sensitive than cold-water corals. Clams and snails are more sensitive than crustaceans.
 
"And we found that early life stages are generally more affected than adult organisms.
 
"But even if an organism isn't directly harmed by acidification it may be affected indirectly through changes in its habitat or changes in the food web.
 
"At the end of the day, these changes will affect the many services the ocean provides to us."

Tags: Oceansealifebiologyresearch

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