Ocean Action Hub

24 Oct 2020 - A group of thirteen researchers from six countries has released a new scientific paper rejecting an earlier study claiming ocean acidification has no effects of the behavior of coral reef fishes.

Earlier this year, a by Clark et al. published in Nature claimed that previous experiments on the effects of elevated CO2 on reef fish behavior could not be repeated, and argued has no effects on the behaviors of coral reef fishes.

In a comprehensive rebuttal published in Nature, lead author Professor Philip Munday from the Centre of Excellence for Coral Reef Studies at James Cook University said there are fundamental methodological differences between the studies conducted in the "provocative" Clark et al. article and the earlier studies with which they made direct comparison.

"There are so many fundamental differences in what Clark et al. have done compared with the previous studies that the comparisons are invalid," Prof Munday said.

The authors of the rebuttal argue that experiments conducted by Clark et al. differed in at least 16 critical ways compared with previous research.

"Clark et al. claim to have closely repeated earlier studies, but failed to replicate key species, used different life stages and ecological histories, and altered methods in critical ways that reduce the likelihood of detecting ocean acidification effects."

Prof Munday said that contrary to their assertions, Clark et al. did not closely replicate the methods of past studies, some conducted over a decade ago. Instead, they made fundamental changes to flume design and methodology that would have affected results. In addition, their experimental treatments lacked the stability needed to meet necessary standards and were much more variable than in previous studies.

"The evidence that elevated CO2 can affect fish behavior is overwhelming," says Prof Göran Nilsson, a co-author from the University of Oslo. "Over 85 peer-reviewed papers by many different authors have demonstrated that elevated CO2 can affect the behavior of fish from coral reefs and other habitats, including at least 8 papers by the authors of Clark et al., which they fail to acknowledge in their paper. They also fail to address the striking result that fish exposed to elevated CO2 have altered behavior and reduced survival in the field."

"A in science is inevitable if no attempt is made to accurately replicate previous work and to acknowledge other vital evidence," Prof Munday said.

CONTINUE READING ONLINE HERE: https://phys.org/news/2020-10-publish-rebuttal-prior-ocean-acidification.html

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James Cook University
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Ocean Acidification