More CO2 will make it harder for tiny shelled organisms to maintain the ocean’s carbon cycle, new research suggests.
For the study, published in the journal Scientific Reports, scientists at the University of California, Davis, raised foraminifera—single-celled organisms about the size of a grain of sand—under future, high CO2 conditions. These tiny organisms, commonly called “forams,” are ubiquitous in marine environments and play a key role in food webs and the ocean carbon cycle.
After exposing them to a range of acidity levels, scientists found that under high CO2, or more acidic, conditions, the foraminifera had trouble building their shells and making spines, an important feature of their shells.
They also showed signs of physiological stress, reducing their metabolism and slowing their respiration to undetectable levels.
This is the first study of its kind to show the combined impact of shell building, spine repair, and physiological stress in foraminifera under high CO2 conditions. The study suggests that stressed and impaired foraminifera could indicate a larger scale disruption of carbon cycling in the ocean.
‘Not out-of-sight, out-of-mind’
As a marine calcifier, foraminifera use calcium carbonate to build their shells, a process that plays an integral part in balancing the carbon cycle.
Normally, healthy foraminifera calcify their shells and sink to the ocean floor after they die, taking the calcite with them. This moves alkalinity, which helps neutralize acidity, to the seafloor.
When foraminifera calcify less, their ability to neutralize acidity also lessens, making the deep ocean more acidic.
But what happens in the deep ocean doesn’t stay in the deep ocean.
“It’s not out-of-sight, out-of-mind,” says lead author Catherine Davis, a doctoral student at UC Davis during the study and now a postdoctoral associate at the University of South Carolina. “That acidified water from the deep will rise again. If we do something that acidifies the deep ocean, that affects atmospheric and ocean carbon dioxide concentrations on time scales of thousands of years.”
Davis says the geologic record shows that such imbalances have occurred in the world’s oceans before, but only during times of major change.
“This points to one of the longer time-scale effects of anthropogenic climate change that we don’t understand yet,” Davis says.
A window into the future
One way acidified water returns to the surface is through upwelling, when strong winds periodically push nutrient-rich water from the deep ocean up to the surface. Upwelling supports some of the planet’s most productive fisheries and ecosystems. But additional anthropogenic, or human-caused, CO2 in the system is expected to impact fisheries and coastal ecosystems.
UC Davis’ Bodega Marine Laboratory in Northern California is near one of the world’s most intense coastal upwelling areas. At times, it experiences conditions most of the ocean isn’t expected to experience for decades or hundreds of years.
“Seasonal upwelling means that we have an opportunity to study organisms in high CO2, acidic waters today—a window into how the ocean may look more often in the future,” says coauthor Tessa Hill, an associate professor in earth and planetary sciences. “We might have expected that a species of foraminifera well-adapted to Northern California wouldn’t respond negatively to high CO2 conditions, but that expectation was wrong.
“This study provides insight into how an important marine calcifier may respond to future conditions, and send ripple effects through food webs and carbon cycling,” she adds.
The study’s other coauthors are from UC Davis and Virginia Institute of Marine Science. The National Science Foundation and the Cushman Foundation Johanna M. Resig Fellowship supported the study.
Source: UC Davis