Stress-resistant corals may not acclimatize to ocean warming but maintain heat tolerance under cooler temperatures

Verena Schoepf, Steven Carrion, Svenja M. Pfeifer, Melissa Naugle, Laurence Dugal, Jennifer Bruyn, Malcolm McCulloch

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Abstract

Naturally heat-resistant coral populations hold significant potential for facilitating coral reef survival under rapid climate change. However, it remains poorly understood whether they can acclimatize to ocean warming when superimposed on their already thermally-extreme habitats. Furthermore, it is unknown whether they can maintain their heat tolerance upon larval dispersal or translocation to cooler reefs. We test this in a long-term mesocosm experiment using stress-resistant corals from thermally-extreme reefs in NW Australia. We show that these corals have a remarkable ability to maintain their heat tolerance and health despite acclimation to 3-6°C cooler, more stable temperatures over 9 months. However, they are unable to increase their bleaching thresholds after 6-months acclimation to +1°C warming. This apparent rigidity in the thermal thresholds of even stress-resistant corals highlights the increasing vulnerability of corals to ocean warming, but provides a rationale for human-assisted migration to restore cooler, degraded reefs with corals from thermally-extreme reefs.
Original languageEnglish
Article number4031
JournalNature Communications
Volume10
DOIs
Publication statusPublished - 17 Sep 2019

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heat tolerance
reefs
Anthozoa
Reefs
coolers
Oceans and Seas
oceans
Temperature
heating
Coral Reefs
Acclimatization
coral reefs
Hot Temperature
vulnerability
habitats
thresholds
temperature
climate change
bleaching
rigidity

Cite this

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title = "Stress-resistant corals may not acclimatize to ocean warming but maintain heat tolerance under cooler temperatures",
abstract = "Naturally heat-resistant coral populations hold significant potential for facilitating coral reef survival under rapid climate change. However, it remains poorly understood whether they can acclimatize to ocean warming when superimposed on their already thermally-extreme habitats. Furthermore, it is unknown whether they can maintain their heat tolerance upon larval dispersal or translocation to cooler reefs. We test this in a long-term mesocosm experiment using stress-resistant corals from thermally-extreme reefs in NW Australia. We show that these corals have a remarkable ability to maintain their heat tolerance and health despite acclimation to 3-6°C cooler, more stable temperatures over 9 months. However, they are unable to increase their bleaching thresholds after 6-months acclimation to +1°C warming. This apparent rigidity in the thermal thresholds of even stress-resistant corals highlights the increasing vulnerability of corals to ocean warming, but provides a rationale for human-assisted migration to restore cooler, degraded reefs with corals from thermally-extreme reefs.",
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Stress-resistant corals may not acclimatize to ocean warming but maintain heat tolerance under cooler temperatures. / Schoepf, Verena; Carrion, Steven; Pfeifer, Svenja M.; Naugle, Melissa ; Dugal, Laurence; Bruyn, Jennifer; McCulloch, Malcolm.

In: Nature Communications, Vol. 10, 4031, 17.09.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Stress-resistant corals may not acclimatize to ocean warming but maintain heat tolerance under cooler temperatures

AU - Schoepf, Verena

AU - Carrion, Steven

AU - Pfeifer, Svenja M.

AU - Naugle, Melissa

AU - Dugal, Laurence

AU - Bruyn, Jennifer

AU - McCulloch, Malcolm

PY - 2019/9/17

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AB - Naturally heat-resistant coral populations hold significant potential for facilitating coral reef survival under rapid climate change. However, it remains poorly understood whether they can acclimatize to ocean warming when superimposed on their already thermally-extreme habitats. Furthermore, it is unknown whether they can maintain their heat tolerance upon larval dispersal or translocation to cooler reefs. We test this in a long-term mesocosm experiment using stress-resistant corals from thermally-extreme reefs in NW Australia. We show that these corals have a remarkable ability to maintain their heat tolerance and health despite acclimation to 3-6°C cooler, more stable temperatures over 9 months. However, they are unable to increase their bleaching thresholds after 6-months acclimation to +1°C warming. This apparent rigidity in the thermal thresholds of even stress-resistant corals highlights the increasing vulnerability of corals to ocean warming, but provides a rationale for human-assisted migration to restore cooler, degraded reefs with corals from thermally-extreme reefs.

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