IPCC Research Confidence in the field of Coral Reef Futures – Jennifer McWhorter

Research Confidence in the field of Coral Reef Futures

(Based on IPCC 2019 Report, Chapter 5, Changing Ocean, Marine Ecosystems, and Dependent Communities)

Author, Jennifer McWhorter, PhD Candidate QUEX (Universities of Queensland and Exeter)

The Intergovernmental Panel on Climate Change (IPCC) consists of a team of top researchers and scientists advising global climate action. Recently, the IPCC wrote a special report updating research findings pertaining to 1.5 ℃ of warming, of particular interest to my field of research is the section on coral reefs. Based on Chapter 5 of the latest IPCC report (Bindoff, N.L et al., 2019), I have highlighted the consensus of scientific research by summarizing key topics of coral reef research by research confidence. In italics are statements summarized from the report.


Very High Confidence Overview of Research

Some alarming numbers on the future of coral reefs were confidently stated in the latest IPCC report, “coral reefs are projected to decline by a further 70-90% at 1.5 ℃ with larger losses (>99%) at 2 ℃ ”. Since the industrial revolution in the 19th century, human activities have contributed to approximately 1.0 ℃ of global warming. At our current rate of emissions, global warming is estimated to reach 1.5 ℃ between 2030 and 2052. (IPCC, 2019: Summary for Policymakers). To give you some perspective on those numbers, future generations will have a difficult time finding coral reefs in the state in which we have had the privilege of experiencing them.

The corals in the image above were photographed two months apart showing the effect of the last warming event at Pixie Reef, just north of Cairns, on the Great Barrier Reef. On the left, the corals are healthy and then two months later, the image on the right shows many of the same corals are stressed and near mortality (bleached or white in colour). (Photo credit: Brett Monroe Garner)


High Confidence Overview of Research

When the human body has a weakened immune system, such as experiencing chemotherapy from cancer treatment, a common cold or flu can be detrimental, leading to a worsened state or even death. Coral reefs facing multiple disturbances such as warming and ocean acidification, reef dissolution and bioerosion, enhanced storm intensity, enhanced turbidity, and/or enhanced run-off have a lower chance of recovery. In the future, when faced with multiple threats, there will be a shift in species composition and biodiversity. This shift will be towards soft corals and algal dominated reefs as opposed to reef building corals. Albeit, regional differences in levels of reef vulnerability exist on a scale of 100 km or by latitudinal gradients.

The image above portrays an example of the shift in dominance from reef building corals to a dominance of non-coral organisms, such as the pictured ascidian, Didemnum molle and algae in Palau, Micronesia. (Photo credit: Dr. Kennedy Wolfe)


Medium Confidence Overview of Research

Record breaking warm water temperatures during 2014-2017 resulted in severe and wide-spread global coral mortality (Eakin et al., 2019). The reefs that have survived this event have a higher thermal threshold resulting in a dominance of species that are not as sensitive and have a high adaptive capacity. Is this a glimmer of hope? Perhaps but, it is important to note that this is the category of medium confidence of an overview of the research.

Branching corals are typically less resilient in warm water conditions than stony, non-branching corals (Hughes et al., 2018). This juvenile Acropora (branching coral) offers hope of recovery on a reef in Palau, Micronesia. (Photo credit: Dr. Kennedy Wolfe)

In a physical world, the ocean is complex, different zones of the ocean experience various conditions in space and time. Coral reef habitats are not uniform. Deeper coral reefs (30-150m) and upwelling zones may serve as a refuge and source of larval supply to disturbed reefs. On the contrary, these reefs could be more at risk than suggested.

Low Confidence Overview of Research

Coral reefs require certain light and temperature conditions in order to grow. The rate of sea level rise may outpace coral growth. Sea level rise would send corals into deeper habitats potentially limiting these ideal light and temperature conditions.

Resilience and adaptation is broadly still unknown, few reefs are showing resilience. Luckily, some of the best in the world are working hard to close this gap.

In Palau, Micronesia, Professor Peter Mumby descends onto the reef. Pete’s Marine Spatial Ecology Lab conducts research into coral reef ecosystems, fisheries, modeling, and socioeconomics. (Photo credit: Dr. Kennedy Wolfe)

Support climate change research initially by learning about it. Thank you for reading.

You can follow Jen on Twitter to keep up to date with her research!

#ExeterMarine is an interdisciplinary group of marine related researchers with capabilities across the scientific, biological,  medical, engineering, humanities and social science fields.

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Bindoff, N.L., W.W.L. Cheung, J.G. Kairo, J. Arístegui, V.A. Guinder, R. Hallberg, N. Hilmi, N. Jiao, M.S. Karim, L. Levin, S. O’Donoghue, S.R. Purca Cuicapusa, B. Rinkevich, T. Suga, A. Tagliabue, and P. Williamson, 2019: Changing Ocean, Marine Ecosystems, and Dependent Communities. In: IPCC Special Report on the Ocean and Cryosphere in a Changing Climate [H.-O. Pörtner, D.C. Roberts, V. Masson-Delmotte, P. Zhai, M. Tignor, E. Poloczanska, K. Mintenbeck, A. Alegría, M. Nicolai, A. Okem, J. Petzold, B. Rama, N.M. Weyer (eds.)]. In press.

Eakin, C. Mark, Hugh PA Sweatman, and Russel E. Brainard. “The 2014–2017 global-scale coral bleaching event: insights and impacts.” Coral Reefs 38.4 (2019): 539-545.

Hughes, T. P., Kerry, J. T., Baird, A. H., Connolly, S. R., Dietzel, A., Eakin, C. M., … & McWilliam, M. J. (2018). Global warming transforms coral reef assemblages. Nature, 556(7702), 492.

IPCC, 2019: Summary for Policymakers. In: IPCC Special Report on the Ocean and Cryosphere in a Changing Climate [H.-O. Pörtner, D.C. Roberts, V. Masson-Delmotte, P. Zhai, M. Tignor, E. Poloczanska, K. Mintenbeck, A. Alegría, M. Nicolai, A. Okem, J. Petzold, B. Rama, N.M. Weyer (eds.)]. In press.

Scientists at Sea Podcast – Sail Against Plastic Part II

Show notes

You might remember that earlier in the series we spoke to Flora Rendell and Lowenna Jones about an arctic sailing expedition they were about to embark upon in 2018 titled ‘Sail Against Plastic’. Well they’ve been there, done that, and got the microplastic samples to prove it. If you didn’t catch the episode, I would recommend having a listen to it here.

The Sail Against Plastic team – Photo credit – Ben Porter

In short, Sail Against Plastic was a two-week multidisciplinary research expedition taking place in the waters off Svalbard. Sailing aboard the Blue Clipper, the team investigated the impact of plastics and noise pollution on this arctic environment whilst producing film, photography and artwork to capture the experience and illustrate their findings. You can find out about the background of the expedition on the Sail Against Plastic website.

This time Flora is joining us with Daniel Osmond, with both of them being greatly involved in the scientific aspect of the expedition. Since recording they have both gone on to secure PhDs, well done to both!

“It was just a great example of how different people with different experiences, interests and skill sets can all come together”

About our guests

Flora Rendell – Scientific Director

Flora is a current postgraduate research student at the University of Exeter, with a strong interest in science outreach and the effects of anthropogenic stressors on populations and habitats. Her key interests in aquatic habitats and the conservation and management of local sites around the UK.



Daniel Osmond – Scientific Officer

Daniel is an MSci Zoology Student at the University of Exeter. During his degree program and ongoing work in Wotton’s research group he has been spurred on to use ecological knowledge to help us to protect threatened ecosystems.



You can find out more about the team through this link.

Topics discussed

The Blue Clipper: Photo credit – Jamie Haigh
  • Background of Sail Against Plastic
  • Where did the expedition go?
  • How do you do plastic research on a ship that’s not designed for it?
  • How to analyse the microplastics samples that were found
  • Building the team
  • Multidisciplinary expeditions – Science, art, film-making all in one trip.
  • How the expedition was funded
  • Citizen Science projects
  • How do you make the best of 24 hours daylight for research?




The Sail Against Plastic expedition film can be viewed above.

Sail Against Plastic Blog

Expedition Photography

Sail Against Plastic Twitter

Sail Against Plastic Facebook

This was Ethan’s final episode (for now, at least), if you want to follow his adventures, take a look at the Trail and Errors website.

Hosted by Ethan Wrigglesworth and Ben Toulson

Episode and show notes produced by Ben Toulson and Ethan Wrigglesworth

Check out other episodes of the podcast here.

You can subscribe on most podcast apps, if you’re feeling kind please leave us a review!

#ExeterMarine is an interdisciplinary group of marine related researchers with capabilities across the scientific, medical, engineering, humanities and social science fields. If you are interested in working with our researchers or students, contact Michael Hanley or visit our website!