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Updated: Jan 6, 2026
04:22
Physiological Characterization of the Coral Holobiont Using a New Micro-Respirometry Tool
Published on: April 28, 2023
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Marine Heatwaves Transform Coral Symbioses With Enduring Effects
Alexander Van Nynatten1, Ross Cunning2, Kristina L Tietjen1
1Department of Biology, University of Victoria, Victoria, British Columbia, Canada.
Ecology Letters
|November 16, 2025
Summary
Extreme heatwaves cause lasting damage to coral reef symbionts, altering their communities for years. This research highlights long-term impacts on coral resilience and symbiont recovery post-heatwave.
Area of Science:
- Marine biology
- Ecology
- Climate change science
Background:
- Coral reefs face global ecological shifts due to climate change-amplified extreme weather.
- Coral-algal symbiosis is crucial for coral resilience, with symbiont identity playing a key role.
- Long-term effects of marine heatwaves on coral symbioses are poorly understood due to limited longitudinal data.
Purpose of the Study:
- To investigate the long-term impacts of marine heatwaves on coral symbiont communities.
- To assess the persistence of symbiont assemblage changes following a major heatwave event.
- To understand factors influencing coral symbiont recovery and resilience.
Main Methods:
- A decadal survey (2013-2023) of coral symbionts in two species.
- Monitoring symbiont composition spanning a major tropical marine heatwave (2015-2016) and its aftermath.
- Analysis of symbiont data to track changes and recovery over time.
Main Results:
- Documented wholesale transformation of symbiont assemblages in two coral species following mass mortality during the 2015-2016 heatwave.
- Observed that these symbiont shifts persisted for at least 7 years post-heatwave.
- Found evidence of local symbiont extinction, impeded recovery due to human disturbance, and novel symbiont associations in new coral recruits.
Conclusions:
- Marine heatwaves can induce long-lasting alterations in coral symbiont communities.
- The legacy of heatwave-driven symbiont changes can persist for years, impacting coral resilience.
- Future coral reef resilience may be compromised by the persistent effects of extreme heat events on vital symbioses.
Keywords:
El Niñoclimate changecommunity compositioncoral bleachingextreme weather eventslegacy effectsmultiple stressorsresilienceMore Related Videos
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