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Marine economy sinks as ocean acidity rises

August 5, 2014
Reading time: 3 minutes
Primary Author: Kieran Cooke

 

Research has highlighted the negative effect acidification of oceans can have on marine life, but now fishing communities are waking up to the big threat it poses to their livelihoods. LONDON, 6 August, 2014 − The waters off the US state of Alaska are some of the best fishing grounds anywhere, teeming with salmon and with shellfish such as crab. But a new study, funded by the US National Oceanic and Atmospheric Administration (NOAA), says growing acidification of Alaska’s waters, particularly those off the southern coast, threatens the state’s whole economy − largely dependent on the fishing industry. The study, which appears in the journal Progress in Oceanography, says that not only will the state’s commercial fishing sector be badly hit by a growth in acidification, but it will also affect subsistence fisherpeople whose diet mainly consists of the catch from local waters.

Forming acid

The oceans act as a “carbon sink”, absorbing vast amounts of carbon dioxide. Acidification occurs when amounts of carbon dioxide are dissolved into seawater, where it forms carbonic acid. Scientists say the oceans are now 30% more acidic than they were at the beginning of the industrial revolution about 250 years ago. Among the sea species most vulnerable to acidification are shellfish, because a build-up of acid in waters prevents species developing their calcium shells. Alaska’s salmon stocks are also at risk as one of the main ingredients of a salmon diet are pteropods, small shell creatures. Jeremy Mathis, an NOAA oceanographer and a lead author of the study, told the Alaska Dispatch News that whereas past reports had focused on the consequences of increased acidification on ocean species, the aim of this one was designed to examine the wider economic impact. “This is an economic-social study,” Mathis said. “It focuses on food security, employment opportunity, and the size of the economy.” Mathis said acidification is more likely in Alaskan waters than in many other parts of the world. He explained: “It’s all about geography. The world’s ocean currents end their cycles here, depositing carbon dioxide from elsewhere. The coastal waters of Alaska sit right at the end of the ocean conveyor belt.” Elsewhere, acidification is already having a serious impact on fishing and shellfish industries.

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Oysters dying

The New York Times reports that billions of baby oysters – known as spat – are dying off the coast of Washington state in the north-western US. In May this year, the US government’s major report on climate change, the National Climate Assessment, said that waters off the north-west of the country are among the world’s most acidic. Jay Inslee, Governor of Washington, says an industry worth US$270 million is at risk. “You can’t overstate what this means to Washington,” he says. Inslee and many others in Washington state are fighting plans by the coal industry to build large coal ports in the region in order to export to China and elsewhere in Asia. Climate scientists say greenhouse gas emissions resulting from coal burning are a main cause of global warming. − Climate News Network



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