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Climate change could bring more severe bacterial infections, including in corals

Climate change could bring more severe bacterial infections, including in corals
RR varied with direction of temperature change. Credit: PLOS Biology (2024). DOI: 10.1371/journal.pbio.3002900

Could the fungal apocalypse of The Last of Us have roots in reality? A new UBC study in the journal PLOS Biology shows that climate warming can potentially make bacterial and fungal infections deadlier for cold-blooded animals like corals, insects, and fish, raising questions about the broader risks warming temperatures pose to ecosystems and biodiversity—and potentially humans.

Drs. Kayla King and Jingdi (Judy) Li synthesized 60 experimental studies on cold-blooded animals with bacterial, fungal and other infections, noting that cold-blooded animals are directly dependent upon temperature and so, could be particularly sensitive to the effects of global warming.

The studies covered 50 species including land insects, fish, mollusks and corals—some of the most biodiverse and most at-risk ecosystems on the planet.

Using statistical models, the researchers found that cold-blooded animals with bacterial infections were more likely to die when exposed to higher temperatures compared to their usual environmental conditions.

The analysis showed that animals infected by felt the impact of warming within a specific temperature range. They did not die more frequently as temperatures rose—unless the temperature rose towards the ideal range for fungi, known as the "thermal optimum." At this point, infected animals were more likely to die. However, when temperatures became too high for the fungi to survive, in infected animals decreased.

"These findings suggest that may pose a greater risk to cold-blooded animals, an important part of the ecosystem," said Dr. Li. She added that more research is needed on how rising temperatures impact warm-blooded animals, including humans.

Dr. King noted that the results offer insights to help forecast the risks to in a warming, disease-prone world.

More information: Jingdi Li et al, Excess mortality of infected ectotherms induced by warming depends on pathogen kingdom and evolutionary history, PLOS Biology (2024).

Journal information: PLoS Biology

Citation: Climate change could bring more severe bacterial infections, including in corals (2024, December 2) retrieved 9 June 2025 from /news/2024-12-climate-severe-bacterial-infections-corals.html
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