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Climate Change May Benefit Native Oysters, but There鈥檚 a Catch

Oysters Can Tolerate Extremes Better Than Predatory Snails Can 鈥 If the Snails Don鈥檛 Get Them First

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Invasive oyster drill on native oyster, California
An invasive female oyster drill and her eggs attach to a native Olympia oyster in Tomales Bay, California. Photo: Brian Cheng/嘿嘿视频

Quick Summary

  • Invasive oyster drills, a type of snail, prey on native oysters
  • Native oysters can tolerate extreme temperatures better than oyster drills can
  • Under climate change, the oyster drill problem is expected to get worse before it gets better
  • Managing invasive oyster drills will be key to the survival of wild and farmed oysters under climate change

Amid efforts to restore native oyster populations on the West Coast, how are oysters expected to fare under climate change in the decades and centuries to come? Not too badly, according to a study from the University of California, Davis. But there鈥檚 a big 鈥渋f鈥 involved.

In Oct. 10 in the journal Functional Ecology, researchers investigated oysters in the lab and in oyster beds at California鈥檚 Tomales Bay and San Francisco Bay. They found that certain components of climate change may actually benefit oysters in California in the long term, provided they have enough food, because they tend to grow faster at warmer temperatures. Good news? Not so fast.

Meet oyster drills, two species of predatory snails introduced to California from the East Coast and Asia. While oysters are more tolerant of extreme temperatures and low salinity, such as can occur during floods, warming over the next few decades first benefits the oyster drills, increasing the rate at which they eat the oysters.

Oyster drills 鈥榯he worst way to go鈥

鈥淭o me, it鈥檚 the worst way to go,鈥 said lead author Brian Cheng, a doctoral candidate at 嘿嘿视频 Bodega Marine Laboratory at the time of the study and currently a postdoctoral fellow at the Smithsonian Environmental Research Center. 鈥淚magine you鈥檙e an oyster. You have a suit of armor you wear and that you cannot move. Imagine there was something that could crawl onto you and begin blasting away on your shell of armor. Imagine they could secrete acid and use a file-like tongue to bore tiny little holes into the shell. Then they insert their tongue and tear away bits of flesh, eating you alive. Once the hole is made, the oyster is basically done.鈥

Oyster with hole marks from oyster drill
This native oyster from Tomales Bay, California, has survived four drilling attempts by oyster drills, a predatory snail. Photo: Brian Cheng/嘿嘿视频

The silver lining is that oyster drills are relatively easy to find, identify and remove. Cheng said this makes them a good candidate for eradication.

The last native oyster

Oysters are an iconic California seafood, and while the Olympia oyster is the only native oyster on the West Coast, it is no longer fished in California. Most oysters slurped down by consumers are farmed Pacific oysters native to Asia.

But wild oysters hold benefits beyond the gustatory: Their complex shell formations harbor other animals and plants, serving as habitat. Researchers are also investigating how they may help buffer the effects of sea level rise, contributing to a 鈥渓iving shoreline鈥 that reduces rates of erosion. 

In addition to holding management implications for native oyster populations, the study is also relevant for oyster farms, though they were not the focus of the research. Oyster farmers are well aware of oyster drill issues, Cheng said, but the study points out that the drill problem is expected to get worse before it gets better, and that management will be key to the survival of both oysters and oyster farms.

鈥淥ysters are expected to do better if provided with unlimited resources, but we don鈥檛 know if that will be the case in the wild under climate change,鈥 Cheng said. 鈥淪o while there鈥檚 evidence they could do better, by no means is it a slam dunk. Other aspects of climate change, such as ocean acidification, may continue to be detrimental to oysters.鈥

The study was funded by the National Estuarine Research Reserve, National Park Service, 嘿嘿视频 Bodega Marine Laboratory, and National Science Foundation.

Read and other climate change on the 嘿嘿视频 website.

Media Resources

Kat Kerlin, 嘿嘿视频 News and Media Relations, 530-750-9195, kekerlin@ucdavis.edu

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