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New study finds climate change threatens marine protected areas
Expected levels of ocean warming will transform marine ecosystems worldwide, beginning as early as 2050
(Chapel Hill, N.C.— May 7, 2018) – New research from the University of North Carolina at Chapel Hill and collaborators found that most marine life in marine protected areas will not be able to tolerate warming ocean temperatures caused by greenhouse gas emissions. Marine protected areas have been established as a haven to protect threatened marine life, like polar bears, penguins and coral reefs, from the effects of fishing and other activities like mineral and oil extraction. The study found that with continued “business-as-usual” emissions, the protections currently in place won’t matter, because by 2100, warming and reduced oxygen concentration will make marine protected areas uninhabitable by most species currently residing in those areas.
The study, published today in Nature Climate Change, predicts that under the Intergovernmental Panel on Climate Change’s Representative Concentration Pathway 8.5 emissions scenario, better known as the “business as usual scenario,” marine protected areas will warm by 2.8 degrees Celsius (or 5 degrees Fahrenheit) by 2100.
The study concludes that such rapid and extreme warming would devastate the species and ecosystems currently located in marine protected areas. This could lead to extinctions of some of the world’s most unique animals, loss of biodiversity, and changes in ocean food-webs. It could also have considerable negative impacts on the productivity of fisheries and on tourism revenue. Many of these marine species exist as small populations with low genetic diversity that are vulnerable to environmental change and unlikely to adapt to ocean warming.
The study also estimated the year in which marine protected areas in different ecoregions would cross critical thresholds beyond which most species wouldn’t be able to tolerate the change. For many areas in the tropics, this will happen as soon as the mid-21st century.
“With warming of this magnitude, we expect to lose many, if not most, animal species from marine protected areas by the turn of the century,” said John Bruno, lead author, marine ecologist, and biology professor in the College of Arts and Sciences at UNC-Chapel Hill. “To avoid the worst outcomes, we need to immediately adopt an emission reduction scenario in which emissions peak within the next two decades and then decrease very significantly, replacing fossil fuels with cleaner energy sources like solar and wind.”
Key takeaways include:
- There are 8,236 marine protected areas around the world, although they only cover about 4 percent of the surface of the ocean.
- The projected warming of 2.8 degrees Celsius (or 5 degrees Fahrenheit) by 2100 would fundamentally disrupt the ecosystems currently located in marine protected areas.
- Mean sea-surface temperatures within marine protected areas are projected to increase 0.034 degrees Celsius (or 0.061 degrees Fahrenheit) per year.
- Marine protected areas in the Arctic and Antarctic are projected to warm especially quickly, threatening numerous marine mammals like polar bears and penguins.
- The marine protected areas at the greatest risk include those in the Arctic and Antarctic, in the northwest Atlantic, and the newly designated no-take reserves off the northern Galápagos islands Darwin and Wolf.
“There has been a lot of talk about establishing marine reserves to buy time while we figure out how to confront climate change,” said Rich Aronson, ocean scientist at Florida Institute of Technology and a researcher on the study. “We’re out of time, and the fact is we already know what to do: We have to control greenhouse gas emissions.”
The research was conducted in collaboration with researchers at Florida Institute of Technology, Polar Bears International, University of Southampton, Memorial University of Newfoundland, Marine Conservation Institute, NOAA Atlantic Oceanographic and Meteorological Laboratory, University of Miami and the National Oceanography Centre.
Bruno is available for interviews. Please let us know if you’d like to arrange a time to learn more.
The photo below shows the projected warming per year (indicated by the color-coded bar on the right) of the world’s marine protected areas (indicated by the black dots).
About the University of North Carolina at Chapel Hill
The University of North Carolina at Chapel Hill, the nation’s first public university, is a global higher education leader known for innovative teaching, research and public service. A member of the prestigious Association of American Universities, Carolina regularly ranks as the best value for academic quality in U.S. public higher education. Now in its third century, the University offers 77 bachelor’s, 111 master’s, 65 doctorate and seven professional degree programs through 14 schools and the College of Arts and Sciences. Every day, faculty, staff and students shape their teaching, research and public service to meet North Carolina’s most pressing needs in every region and all 100 counties. Carolina’s more than 322,000 alumni live in all 50 states, the District of Columbia and 165 countries. More than 175,000 live in North Carolina.
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