JoNova

A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).


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Scientists “thrilled”: fish cope with acidification if tanks mimic normal large daily CO2 swings

The real story here is that past scares claiming that ocean acidification would create reckless fish were most likely an artefact of an inadequate experiment. There are big swings of CO2 and pH in shallow water environments, and the normal day-night cycle turns out to be good for fish. Putting them in a laboratory tank without these daily changes may create fish that behave badly. So ocean acidification is not only natural, but a good and necessary thing.

New hope for reef fish living in a high CO2 world

Chemical changes in the ocean, as a result of climate change, are leading to a more acidic environment, referred to as ‘ocean acidification’ (OA). In a laboratory setting, these changes have been shown to lead to a range of risky behaviours in the affected fish, with some fish unable to flee from their finned foes effectively.

But, when researchers recalibrated experiments to adjust for natural daily changes in concentrations of dissolved carbon dioxide (CO2), the primary chemical driver of OA, they found that the fish were less affected than previously thought.

“Shallow water habitats where reef fish live can experience substantial natural fluctuations [...]

Great Barrier Reef scare: exaggerated threats says head of GBR Authority

The ABC uses photos of reef bleaching on Flowerpot Rock in American Samoa in stories about the Great Barrier Reef.

The chairman of the Great Barrier Reef Marine Park Authority, Russell Reichelt says that activist groups are distorting surveys, maps and data to exaggerate the coral bleaching on the reef. The bleaching affects 22% of the reef and is mostly localized to the far northern section, which has good prospects of recovery.

Two reef groups are in conflict. One is Reichelt’s GBR Authority, and the other is a special “National Coral Bleaching Taskforce” run by a guy called Terry Hughes.  The Australian media was overrun with stories last week about how a report was censored to hide the damage. What was under-reported was the conflict and the propaganda.

The real problem appears to be that yet another agency was set up to find a crisis, and their existence depends on finding one. The Taskforce was set up in October last year.

ABC repeats all the Taskforce’s claims without question:  “Great Barrier Reef: Only 7 per cent not bleached, survey finds”.

The Taskforce’s report was so bad the GBR authority had to withdraw from it:

Great Barrier Reef: scientists [...]

Researchers astonished: Coral reefs thriving in a more “acidic” ocean

Palau Islands

The researchers at Woods Hole have spent four years doing a comprehensive study at Palau Rock Islands in the far Western Pacific, where pH levels are naturally “more acidic” (which is  big-government speak for less alkaline). Because of laboratory experiments Barkley et al [1] expected to find all kinds of detrimental effects, but instead found a diverse healthy system they describe as “thriving” with “greater coral cover” and more “species”.

A new study led by scientists at Woods Hole Oceanographic Institution (WHOI) found that the coral reefs there seem to be defying the odds, showing none of the predicted responses to low pH except for an increase in bioerosion — the physical breakdown of coral skeletons by boring organisms such as mollusks and worms. The paper is to be published June 5 in the journal Science Advances.

‘Based on lab experiments and studies of other naturally low pH reef systems, this is the opposite of what we expected,’ says lead author Hannah Barkley, a graduate student in the WHOI-MIT joint program in oceanography.

Experiments measuring corals’ responses to a variety of low pH conditions have shown a range of negative impacts, [...]