Blue mussels in acidified seawater for 32 days had suppressed immune responses. (Laboratory study)

Normally, common periwinkles produce thicker shells in the presence of crab predators. This study found that they did not do so when living in acidified seawater for 15 days. The snails apparently compensated for their lack of defensive shell-building by moving more to avoid the crabs. In a ...

Health of Atlantic halibut may be affected by moderate ocean acidification—by itself and combined with warmer temperatures.

Survival of pteropods in Puget Sound, Washington, may not be greatly affected by present ocean pH levels and those projected for the near future, although their shells may be more prone to dissolving. (Laboratory study)

Adult copepods living in acidified water had lower egg production and hatching success. (Laboratory study)

Ocean acidification conditions interfered with the chemoreception, or "smelling", that hermit crabs use to find shells and prey. The hermit crabs moved less, had lower flicking rates of their antennae (a ‘sniffing’ behavior in decapods), and were less successful in locating the odor source. (Laboratory study)

Hermit crabs living in highly acidified seawater (pH 6.8) were less likely to leave a suboptimal shell in favor of an optimal shell. Those that did change shells took longer to do so. Crabs in acidified water also moved less and had lower flicking rates of their antennae (a ‘sniffing’ ...

A species of burrowing shrimp was able to tolerate ocean acidification conditions (pH 7.64) for 35 days. At a lower pH of 7.35, individuals experienced extracellular acidosis, suggesting they had little or no buffering capacity, although there was no evidence of negative impacts on metabolism, osmotic regulation, shell mineralogy, growth, ...

Ocean acidification increased the rate at which sponges bored into scallop shells. At pH 7.8, sponges bored twice the number of papillar holes and removed two times more shell weight than at pH 8.1. Greater erosion caused by the lower pH weakened the scallop shells. A warmer water temperature had ...

In the gulf toadfish, respiratory gas transport and acid–base balance are affected by ocean acidification. While the full physiological impacts are not known, the changes could compromise several physiological systems. (Laboratory study)