Ocean Acidification May Contribute To Global Shellfish Decline
Stony Brook University researchers find elevated carbon dioxide concentrations impede growth and survival of bivalve larvae
TONY BROOK, N.Y., October 26, 2009 -- Relatively minor increases in ocean acidity brought about by high levels of carbon dioxide have significant detrimental effects on the growth, development, and survival of hard clams, bay scallops, and Eastern oysters, according to researchers at Stony Brook University’s School of Marine and Atmospheric Sciences. In one of the first studies looking at the effect of ocean acidification on shellfish, Stephanie Talmage, PhD candidate, and Professor Chris Gobler showed that the larval stages of these shellfish species are extremely sensitive to enhanced levels of carbon dioxide in seawater. Their work will be published in the November issue of the journal Limnology and Oceanography and is now online at http://www.aslo.org/lo/toc/vol_54/issue_6/index.html.
During the past century the oceans absorbed nearly half of atmospheric carbon dioxide derived from human activities such as burning fossil fuels. As the ocean absorbs carbon dioxide it becomes more acidic and has a lower concentration of carbonate, which shell-making organisms use to produce their calcium carbonate structures, such as the shells of shellfish.
In lab experiments, Talmage and Gobler examined the growth and survivorship of larvae from three species of commercially and ecologically valuable shellfish. They raised the larvae in containers bubbled with different levels of carbon dioxide in the range of concentrations that are projected to occur in the oceans during the 21st century and beyond.
Under carbon dioxide concentrations estimated to occur later this century, clam and scallop larvae showed a more than 50% decline in survival. These larvae were also smaller and took longer to develop into the juvenile stage. Oysters also grew more slowly at this level of carbon dioxide, but their survival was only diminished at carbon dioxide levels expected next century.
Although levels of carbon dioxide in marine environments will continue to rise during this century, organisms in some coastal zones are already exposed to high levels of carbon dioxide due to high levels of productivity and carbon input from sources on land.
“This could be an additional reason we see declines in local stocks of shellfish throughout history,” said Talmage. “We’ve blamed shellfish declines on brown tide, overfishing, and local low-oxygen events. However it's likely that ocean acidification also contributes to shellfish declines.”
Talmage and Gobler hope their work might help improve the success rate of shellfish restoration projects.
About the School of Marine and Atmospheric Sciences at Stony Brook University
The School of Marine and Atmospheric Sciences (SoMAS) is the State University of New York's center for marine and atmospheric research, education, and public service. With more than 85 faculty and staff and more than 500 students engaged in interdisciplinary research and education, SoMAS is at the forefront of advancing knowledge and discovering and resolving environmental challenges affecting the oceans and atmosphere on both regional and global scales.
For more information contact: Leslie Taylor, SoMAS Communications Manager at 631-632-8621 - See more at: http://commcgi.cc.sunysb.edu/cgi-bin/am2/admin.cgi#sthash.0cVhzWnk.dpuf