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Ecol Evol 2022 Feb 12;122:e8607. doi: 10.1002/ece3.8607.
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Low-pH seawater alters indirect interactions in rocky-shore tidepools.

Jellison BM , Elsmore KE , Miller JT , Ng G , Ninokawa AT , Hill TM , Gaylord B .

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 during nighttime low tides, experimentally manipulated declines in seawater pH suppress the anti-predator behavior of snails, bolstering their grazing, and diminishing the top-down influence of predators on basal resources. This attenuation of top-down control is absent in pools maintained experimentally at higher pH. These findings suggest that as ocean acidification proceeds, shifts of behaviorally mediated links in food webs could change how cascading effects of predators manifest within marine communities.

PubMed ID: 35169457
PMC ID: PMC8840877
Article link: Ecol Evol

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