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Effect of ocean acidification on shellfish depends on other stressors
by Brooks Hays
Santa Cruz, Calif. (UPI) May 9, 2016

Starfish babies are back after devastating die-off
Corvallis, Ore. (UPI) May 8, 2016 - A return of starfish babies along the coast of California has conservationists hopeful that a dramatic rebound is underway.

For the last two years, a deadly virus has decimated starfish populations along North America's Pacific coast. Millions of starfish died.

In their absence, however, a baby boom has appeared.

The scientists at Oregon State University, who delivered the good news in the journal PLOS ONE, said the iconic species isn't home free just yet.

Researchers described the number of juveniles found anchored to rocks along the California coast as "off the charts."

"It wasn't a case of high settlement, or more sea stars being born," Bruce Menge, a professor of marine biology at Oregon State, said in a news release. "They just had an extraordinary survival rate into the juvenile stage."

"Whether they can make it into adulthood and replenish the population without succumbing to sea star wasting disease is the big question," Menge said.

During 2014 and 2015, "sea star wasting disease" killed off between 80 and 99 percent of purple sea stars, Pisaster ochraceus. The epidemic affected other sea star species ranging from Baja California to Alaska.

Researchers aren't sure what exactly triggered the virulence. Their latest research effort found no link between the disease and rising ocean temperatures.

The scientists believe a range of environmental factors -- like rising ocean acidification -- may have served as stressors, making the starfish more vulnerable to the disease.

On the dinner table, acid and shellfish pair nicely -- in the ocean, not so much.

Determining the exact effects of ocean acidification on shellfish has proven difficult, however. Though plummeting pH levels have been blamed for shellfish die-offs, the correlations have appeared inconsistent.

New research suggests the response of shellfish to ocean acidification is dependent on a number of other environmental stressors.

In a study of California mussels, researchers at the University of California, Santa Cruz determined that food availability -- or scarcity -- had a significant effect on mussels' vulnerability to ocean acidification. Food availability, the scientists noted, is highly dependent on geography and affected by a complex amalgam of environmental and ecological factors.

"Ocean acidification is likely to progress along our coastline as a patchwork of hotspots rather than a large blanket, and the background conditions in these hotspots can determine how species are affected," Kristy Kroeker, assistant professor of ecology and evolutionary biology at UC Santa Cruz, said in a news release.

Ocean acidification inhibits the ability of mussels and other shellfish to build their protective layer. Because shell-building is an energy-intensive process, food availability is key to a shellfish species' ability to cope with ocean acidification.

Thinner shells make mussels susceptible to predation by dogwhelks, a marine snail.

Cold water, which more easily absorbs CO2, rises from the deep to the surface in a process called upwelling. It's also rich in nutrients. These natural fluctuations allowed researchers to tests the interplay between low-pH seawater, food availability and temperatures -- and to study their effects on the growth and morphology of juvenile mussels, as well as their susceptibility to dogwhelk predation.

"We can use the spatial differences in upwelling to study how species respond to seawater that's high in carbon dioxide," Kroeker explained. "The upwelling of relatively acidic deep water is a natural process, but these waters will become even more acidic in the future."

The mussels developed fastest in locales with frequent upwelling. The nutrients brought by the currents offset the drawbacks of intermittent acidity. Mussels that experienced low pH levels without the benefits of high food availability developed the slowest and were more vulnerable to dogwhelks. High body temperature proved to be another stressor and made mussels more susceptible to the negative effects of ocean acidification.

The findings, detailed in the journal Ecology Letters, are reminder that effective conservation often requires attention to hyperlocal details.

"Most of our tools for managing coastal species and ecosystems -- such as marine protected areas and regulating point source pollution -- are spatially explicit, and this research illustrates there may be hotspots of vulnerability or resilience that we could protect or manage locally," Kroeker concluded.

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