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CO2 Benefits the “Rats and Cockroaches” of Marine World

July 7, 2017 –Beneath the waves, swelling levels of carbon dioxide could be boosting some species to ecological dominance while dooming others.

A study published yesterday in Current Biology suggests ocean acidification is driving a cascading set of behavioral and environmental changes that drains oceans’ biodiversity. Niche species and intermediate predators suffer at the expense of a handful of aggressive species.

Sea-level rise and coral bleaching often dominate discussions about how climate change affects the ocean, but a host of more subtle—and harder to research—trends also play a role in reshaping the world’s marine ecosystems. Among the most pressing questions is how fish react to rising levels of CO2, said Tom Bigford, policy director at the American Fisheries Society.

“The hurdles for behavioral changes are far lower than the hurdles for life and death,” said Bigford, who worked with fish habitats at NOAA for more than three decades.

Now, for the first time, researchers from the University of Adelaide in South Australia have cataloged the changing ways marine species interact with each other.

For three years, they observed marine environments near undersea volcanic vents where CO2 levels are high—providing a window into the future acidity of ocean water—along with adjacent areas of normal acidity. They also conducted behavioral experiments on fish from the different zones to test their responses to food and habitat competition.

Receding kelp means less habitat for intermediate predators, with about half as many near the volcanic vents.

But the acidified conditions proved to be a boon to what the researchers called “the marine equivalent to rats and cockroaches”—small fish with low commercial or culinary value.

Read the full story at the Scientific American

Squid Are Thriving While Fish Decline

May 24, 2016 — The squids are all right — as are their cephalopod cousins the cuttlefish and octopus.

In the same waters where fish have faced serious declines, the tentacled trio is thriving, according to a study published Monday.

“Cephalopods have increased in the world’s oceans over the last six decades,” Zoë Doubleday, a marine ecologist from the University of Adelaide in Australia, and lead author of the study, said in an email. “Our results suggest that something is going on in the marine environment on a large scale, which is advantageous to cephalopods.”

Read the full story at the New York Times

Baby fish will be lost at sea in acidified oceans

December 15, 2015 — The ability of baby fish to find a home, or other safe haven, to grow into adulthood will be severely impacted under predicted ocean acidification, University of Adelaide research has found. 

Published today in the journal Proceedings of the Royal Society B, the researchers report the interpretation of normal ocean sound cues which help baby fish find an appropriate home is completely confused under the levels of CO2 predicted to be found in oceans by the end of the century.

“Locating appropriate homes is a crucial step in the life cycle of fish,” says Tullio Rossi, PhD candidate with the University’s Environment Institute. “After hatching in the open ocean, baby fish travel to reefs or mangroves as safe havens to feed and grow into adults.

“Baby fish can find those places through ocean noise: snapping shrimps and other creatures produce sounds that the baby fish follow.

“But when ocean acidity increases due to increased CO2, the neurological pathways in their brain are affected and, instead of heading towards those sounds, they turn tail and swim away.”

Read the full story at Science Daily

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