Ocean Acidification Wears Down Snail Teeth

The study looked at how lower pH in seawater changes the tiny biting tools of a common shore snail. Scientists kept snails in tanks with a more acidic water level (pH 7. 5) and compared them to snails in near‑normal pH water (pH 8. 1) over seven weeks. They also checked snails that had lived in the wild. To see what happened, researchers used high‑power microscopes and special tests that measure how hard a material is. The outside of the snails’ teeth showed more wear, especially on the tips that touch food. These tips looked rounded and smooth, like they had been rubbed down. The acidic water made the outer layer of the teeth softer and less stiff. It also reduced the amount of silicon that normally helps protect the teeth. Inside the tooth, however, there was only a slight change.

Microscopes that shine light on living tissues found different glow patterns in the teeth of snails from the two water conditions. This suggests that pH can alter the organic parts inside the teeth. The researchers also noticed differences between snails kept in tanks and those from the beach. This means that how often a snail eats, or what it eats, can affect tooth strength too. Overall, the work shows that ocean acidification does more than just damage hard shells. It can also weaken the tools snails use to eat, making them less efficient and possibly hurting their survival chances.

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