Glimpse into the future of acidic oceans shows ecosystems transformed

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Posted July 9, 2013
A zone of ambient acidity shows algae growth. UC Davis researchers from Bodega Marine Laboratory studied three zones of varying acidity off the coast of Italy and found algae dominated highly acidic waters. In waters with lower acidity, "grazers" like sea urchins, help keep algae in check. Credit: Kristy Kroeker/UC Davis

A zone of ambient acidity shows algae growth. UC Davis researchers from Bodega Marine Laboratory studied three zones of varying acidity off the coast of Italy and found algae dominated highly acidic waters. In waters with lower acidity, “grazers” like sea urchins, help keep algae in check. Credit: Kristy Kroeker/UC Davis

Ocean acidification may create an impact similar to extinction on marine ecosystems, according to a study released today by the University of California, Davis.

The study, published online in the journal Proceedings of the National Academy of Sciences, found that ocean acidification can degrade not only individual species, as past studies have shown, but entire ecosystems. This results in a homogenized marine community, dominated by fewer plants and animals.

“The background, low-grade stress caused by ocean acidification can cause a whole shift in the ecosystem so that everything is dominated by the same plants, which tend to be turf algae,” said lead author Kristy Kroeker, a postdoctoral researcher at the Bodega Marine Laboratory at UC Davis.

“In most ecosystems, there are lots of different colorful patches of plants and animals—of algae, of sponges, of anemones,” Kroeker said. “With ocean acidification, you lose that patchiness. We call it a loss of functional diversity; everything looks the same.”

In the waters surrounding Castello Aragonese, a 14th century castle off the coast of Italy, volcanic vents naturally release bubbles of carbon dioxide gas, creating different levels of acidity among the marine-animal and plant communities there. These gradients of acidity gave the scientists a glimpse of what a future marked by increasingly acidic ocean waters could look like, and how the creatures and plants living in those environments may react to it.

Read more at: Phys.org

 



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