Low-pH seawater alters indirect interactions in rocky-shore tidepools

Brittany Jellison, Brian Gaylord, Aaron Ninokawa, Kristen Elsmore, Gabriel Ng, Jeffrey Miller & Tessa Hill
Ocean acidification is expected to degrade marine ecosystems, yet most studies focus on organismal-level impacts rather than ecological perturbations. Field studies are especially sparse, particularly ones examining shifts in direct and indirect consumer interactions. Here we address such connections within tidepool communities of rocky shores, focusing on a three-level food web involving the keystone sea star predator, Pisaster ochraceus, a common herbivorous snail, Tegula funebralis, and a macroalgal basal resource, Macrocystis pyrifera. We demonstrate that...
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