Navigation Links
Local factors cause dramatic spikes in coastal ocean acidity
Date:1/2/2014

DURHAM, N.C. A new Duke University-led study has documented dramatic, natural short-term increases in the acidity of a North Carolina estuary.

"The natural short-term variability in acidity we observed over the course of one year exceeds 100-year global predictions for the ocean as a whole and may already be exerting added pressure on some of the estuary's organisms, particularly shelled organisms that are especially susceptible to changes in pH," said Zackary I. Johnson, Arthur P. Kaupe Assistant Professor of Molecular Biology at Duke's Nicholas School of the Environment.

The short-term spikes in the acidity of the estuary were driven by changes in temperature, water flow, biological activity and other natural factors, the researchers said. And they are occurring in addition to the long-term acidification taking place in Earth's oceans as a result of human-caused climate change.

"For vulnerable coastal marine ecosystems, this may be adding insult to injury," said Johnson, who was lead author of the study.

When the effects of long-term ocean acidification and short-term natural variation combine, they can create "extreme events" which may be especially harmful to coastal marine life, he said.

The study was conducted at the Pivers Island Coastal Observatory at the Duke Marine Lab in Beaufort, N.C., as part of a long-term coastal monitoring program. Researchers collected seawater samples from Beaufort Inlet weekly for a year and on a daily and hourly basis for shorter periods to track changes in the water's pH and dissolved inorganic carbon on multiple time scales.

Numerous studies have shown that increasing amounts of atmospheric carbon dioxide from human sources are finding their way into the world's oceans. When the carbon dioxide dissolves in seawater, it reduces the water's pH and the ability of organisms to form calcium carbonate minerals that are the building blocks of many species' shells and skeletons. This process is known as ocean acidification.

If current trends continue, experts predict that the mean ocean pH will decrease by about 0.2 units over the next 50 years. A drop of that magnitude could have far-reaching effects on ocean ecosystems and organisms.

"We may see significant changes in biological processes such as primary production," said Dana Hunt, assistant professor of microbial ecology, who co-authored the new study. "Some organisms, such as phytoplankton, may benefit. Many others, including shelled organisms and corals, will not."

The Duke team's analysis showed that a wide range of natural variables, including changes in temperature, algal production and respiration, and water movement caused by tides and storms, triggered sharp spikes in the inlet's acidity. Some changes occurred over the course of a season; others took place on a daily or hourly basis.

"Understanding to what extent pH naturally varies in coastal ecosystems worldwide will be essential for predicting where and when the effects of increasing ocean acidity will be most profound, and what organisms and ecosystems may be most affected," Hunt said. "Our research demonstrates we have to take into account a wide range of environmental variables, not just pH."

The study appears in the peer-reviewed open-access journal PLOS ONE.


'/>"/>

Contact: Tim Lucas
tdlucas@duke.edu
919-613-8084
Duke University
Source:Eurekalert

Related biology news :

1. Managing biodiversity data from local government
2. First paternity study of southern right whales finds local fathers most successful
3. Long-distance distress signal from periphery of injured nerve cells begins with locally made protein
4. In Fiji, marine protection gets local boost
5. Global economic pressures trickle down to local landscape change, altering disease risk
6. Greater effort needed to move local, fresh foods beyond privileged consumers
7. Maple syrup, moose, and the local impacts of climate change
8. Chinese scientists discover evidence of giant pandas population history and local adaptation
9. Local therapy followed by treatment with EGFR TKI is well tolerated
10. Methane emissions from natural gas local distribution focus of new study
11. Local Pearle Vision Licensee Adds Second Center In Canton, Ohio
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/15/2016)... New York , June 15, 2016 /PRNewswire/ ... a new market report titled "Gesture Recognition Market by ... and Forecast, 2016 - 2024". According to the report, ... USD 11.60 billion in 2015 and is estimated ... reach USD 48.56 billion by 2024.  ...
(Date:6/2/2016)... , June 2, 2016 The ... has awarded the 44 million US Dollar project, for ... Embossed Vehicle Plates including Personalization, Enrolment, and IT Infrastructure ... leader in the production and implementation of Identity Management Solutions. ... January, however Decatur was selected for ...
(Date:5/20/2016)... , May 20, 2016  VoiceIt is excited ... with VoicePass. By working together, VoiceIt ...  Because VoiceIt and VoicePass take slightly different approaches ... increases both security and usability. ... about this new partnership. "This marketing ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... ... June 23, 2016 , ... UAS LifeSciences, ... launch of their brand, UP4™ Probiotics, into Target stores nationwide. The company, which ... to add Target to its list of well-respected retailers. This list includes such ...
(Date:6/23/2016)... June 23, 2016 Houston Methodist Willowbrook ... Cy-Fair Sports Association to serve as their official ... Houston Methodist Willowbrook will provide sponsorship support, athletic ... with association coaches, volunteers, athletes and families. ... Cy-Fair Sports Association and to bring Houston Methodist ...
(Date:6/23/2016)... FRANCISCO , June 23, 2016   EpiBiome ... has secured $1 million in debt financing from Silicon ... ramp up automation and to advance its drug development ... its new facility. "SVB has been an ... beyond the services a traditional bank would provide," said ...
(Date:6/23/2016)... , June 23, 2016 Apellis Pharmaceuticals, ... 1 clinical trials of its complement C3 inhibitor, ... and multiple ascending dose studies designed to assess ... of subcutaneous injection in healthy adult volunteers. ... either as a single dose (ranging from 45 ...
Breaking Biology Technology: