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Home NEWS Science News Biology

Half of the world’s coral reefs may face unsuitable conditions by 2035

Bioengineer by Bioengineer
October 11, 2022
in Biology
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There’s more bad news for planet earth if climate change continues unabated. New research published on October 11th in the open access journal PLOS Biology by researchers at the University of Hawaiʻi at Mānoa, United States reveals that, under a worst-case scenario, half of coral reef ecosystems worldwide will permanently face unsuitable conditions in just a dozen years.

Half of the world’s coral reefs may face unsuitable conditions by 2035

Credit: Renee Setter (CC-BY 4.0, https://creativecommons.org/licenses/by/4.0/)

There’s more bad news for planet earth if climate change continues unabated. New research published on October 11th in the open access journal PLOS Biology by researchers at the University of Hawaiʻi at Mānoa, United States reveals that, under a worst-case scenario, half of coral reef ecosystems worldwide will permanently face unsuitable conditions in just a dozen years.

The ability of ecosystems to adapt to changes within their environment largely depends upon the type and impact of their specific environmental stressors. Coral reefs, in particular, are sensitive to these unsuitable environmental conditions. However, the timeline for environmental suitability has been up for debate.

Utilizing CMIP5, an experimental framework designed to compute global models designed to improve climate change knowledge, researchers looked at global projections of five environmental stressors from historic scenarios through to projections for the year 2100. These stressors included sea surface temperature, ocean acidification, tropical storm, land use and human population projections.

“While the negative impacts of climate change on coral reefs are well known, this research shows that they are actually worse than anticipated due to a broad combination of climate change-induced stressors,” said lead author Renee Setter, a doctoral student at the University of Hawaiʻi at Mānoa. “It was also enlightening to find that coral would face multiple stressors – posing an even greater hurdle and challenge that would need to be overcome to increase the possibility of survival.”

Setter and colleagues found that, under the business-as-usual scenario, 2050 is the median year where environmental conditions are projected to become unsuitable for the world’s coral reefs when looking at a single stressor. When multiple stressors are considered, the date falls to 2035. Additionally by 2055, it is projected that the majority of the world’s coral reefs (99 percent) would be facing unsuitable conditions based on at least one of the five stressors studied. By 2100, it is anticipated that 93 percent of global reefs would be under threat by two or more of the stressors identified by the researchers.

“We know that corals are vulnerable to increasing sea surface temperatures and marine heatwaves due to climate change. But it is important to include the complete anthropogenic impact and numerous stressors that coral reefs are exposed to in order to get a better sense of the overall risks to these ecosystems,” added co-author Erik Franklin, Associate Research Professor at University of Hawaiʻi at Mānoa. “This has great implications for our local Hawaiian reefs that are key to local biodiversity, culture, fisheries and tourism.”

The research team is now preparing to enter the next phase of their work. They will take a closer look at how climate change is projected to affect individual coral species. By identifying which species are more likely to survive unsuitable conditions and which may be more vulnerable, the team hopes to better understand which species may be more at risk to future stressors.

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In your coverage, please use this URL to provide access to the freely available paper in PLOS Biology:   http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3001821  

Citation: Setter RO, Franklin EC, Mora C (2022) Co-occurring anthropogenic stressors reduce the timeframe of environmental viability for the world’s coral reefs. PLoS Biol 20(10): e3001821. https://doi.org/10.1371/journal.pbio.3001821

Author Countries: United States

Funding: This paper is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. 1842402 (ROS). We would also like to thank the Women Divers Hall of Fame and the University of Hawai‘i at Mānoa Department of Geography and Environment for additional funding and support (ROS). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.



Journal

PLoS Biology

DOI

10.1371/journal.pbio.3001821

Method of Research

Computational simulation/modeling

Subject of Research

Not applicable

COI Statement

Competing interests: The authors have declared that no competing interests exist.

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