Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching
Coral reefs are severely threatened by climate change and recurrent mass bleaching events, highlighting the need for a better understanding of the factors driving recovery and resilience both at the community and species level. While temperature variability has been shown to promote coral heat toler...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | English |
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FRONTIERS MEDIA SA
2020
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/LP160101508 http://hdl.handle.net/20.500.11937/90956 |
| _version_ | 1848765471376015360 |
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| author | Schoepf, V. Jung, M.U. McCulloch, M.T. White, Nicole Stat, Michael Thomas, L. |
| author_facet | Schoepf, V. Jung, M.U. McCulloch, M.T. White, Nicole Stat, Michael Thomas, L. |
| author_sort | Schoepf, V. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Coral reefs are severely threatened by climate change and recurrent mass bleaching events, highlighting the need for a better understanding of the factors driving recovery and resilience both at the community and species level. While temperature variability has been shown to promote coral heat tolerance, it remains poorly understood whether this also influences coral recovery capacity. Similarly, few studies have investigated how the presence of cryptic species influences bleaching and recovery responses. Using an integrated ecological, physiological, and genetic approach (i.e., reef-wide coral health surveys as well as chlorophyll a concentration and cryptic species diversity of Acropora aspera), we examined the recovery of both coral communities and their dominant species from the 2016 mass bleaching event in the macrotidal Kimberley region, NW Australia. We show that recovery of coral communities inhabiting adjacent but environmentally contrasting reef habitats differed dramatically following unprecedented bleaching in 2016. Both intertidal (thermally extreme) and subtidal (thermally moderate) habitats experienced extensive bleaching (72–81%), but subtidal coral communities had a greater percentage of severely bleached corals than the intertidal community (76 versus 53%). Similarly, subtidal A. aspera corals suffered much greater losses of chlorophyll a than intertidal conspecifics (96 versus 46%). The intertidal coral community fully recovered to its prebleaching configuration within 6 months, whereas the adjacent subtidal suffered extensive mortality (68% loss of live coral cover). Despite the presence of three cryptic genetic lineages in the dominant coral species, the physiological response of A. aspera was independent of host cryptic genetic diversity. Furthermore, both intertidal and subtidal A. aspera harbored symbionts in the genus Cladocopium (previously clade C). Our findings therefore highlight the important role of tidally controlled temperature variability in promoting coral recovery capacity. While the underlying physiological and molecular mechanisms require further investigation, we propose that shallow reef environments characterized by strong environmental gradients may generally promote coral resilience to extreme climatic events. Thermally variable reef environments may therefore provide important spatial refugia for coral reefs under rapid climate change. |
| first_indexed | 2025-11-14T11:35:47Z |
| format | Journal Article |
| id | curtin-20.500.11937-90956 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:35:47Z |
| publishDate | 2020 |
| publisher | FRONTIERS MEDIA SA |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-909562023-05-04T08:49:15Z Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching Schoepf, V. Jung, M.U. McCulloch, M.T. White, Nicole Stat, Michael Thomas, L. Science & Technology Life Sciences & Biomedicine Environmental Sciences Marine & Freshwater Biology Environmental Sciences & Ecology coral bleaching recovery capacity temperature variability Kimberley region Acropora aspera cryptic species TEMPERATURE-VARIATION WESTERN-AUSTRALIA CRYPTIC DIVERSITY HEAT TOLERANCE PATTERNS STRESS RESISTANCE Coral reefs are severely threatened by climate change and recurrent mass bleaching events, highlighting the need for a better understanding of the factors driving recovery and resilience both at the community and species level. While temperature variability has been shown to promote coral heat tolerance, it remains poorly understood whether this also influences coral recovery capacity. Similarly, few studies have investigated how the presence of cryptic species influences bleaching and recovery responses. Using an integrated ecological, physiological, and genetic approach (i.e., reef-wide coral health surveys as well as chlorophyll a concentration and cryptic species diversity of Acropora aspera), we examined the recovery of both coral communities and their dominant species from the 2016 mass bleaching event in the macrotidal Kimberley region, NW Australia. We show that recovery of coral communities inhabiting adjacent but environmentally contrasting reef habitats differed dramatically following unprecedented bleaching in 2016. Both intertidal (thermally extreme) and subtidal (thermally moderate) habitats experienced extensive bleaching (72–81%), but subtidal coral communities had a greater percentage of severely bleached corals than the intertidal community (76 versus 53%). Similarly, subtidal A. aspera corals suffered much greater losses of chlorophyll a than intertidal conspecifics (96 versus 46%). The intertidal coral community fully recovered to its prebleaching configuration within 6 months, whereas the adjacent subtidal suffered extensive mortality (68% loss of live coral cover). Despite the presence of three cryptic genetic lineages in the dominant coral species, the physiological response of A. aspera was independent of host cryptic genetic diversity. Furthermore, both intertidal and subtidal A. aspera harbored symbionts in the genus Cladocopium (previously clade C). Our findings therefore highlight the important role of tidally controlled temperature variability in promoting coral recovery capacity. While the underlying physiological and molecular mechanisms require further investigation, we propose that shallow reef environments characterized by strong environmental gradients may generally promote coral resilience to extreme climatic events. Thermally variable reef environments may therefore provide important spatial refugia for coral reefs under rapid climate change. 2020 Journal Article http://hdl.handle.net/20.500.11937/90956 10.3389/fmars.2020.00245 English http://purl.org/au-research/grants/arc/LP160101508 http://creativecommons.org/licenses/by/4.0/ FRONTIERS MEDIA SA fulltext |
| spellingShingle | Science & Technology Life Sciences & Biomedicine Environmental Sciences Marine & Freshwater Biology Environmental Sciences & Ecology coral bleaching recovery capacity temperature variability Kimberley region Acropora aspera cryptic species TEMPERATURE-VARIATION WESTERN-AUSTRALIA CRYPTIC DIVERSITY HEAT TOLERANCE PATTERNS STRESS RESISTANCE Schoepf, V. Jung, M.U. McCulloch, M.T. White, Nicole Stat, Michael Thomas, L. Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching |
| title | Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching |
| title_full | Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching |
| title_fullStr | Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching |
| title_full_unstemmed | Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching |
| title_short | Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching |
| title_sort | thermally variable, macrotidal reef habitats promote rapid recovery from mass coral bleaching |
| topic | Science & Technology Life Sciences & Biomedicine Environmental Sciences Marine & Freshwater Biology Environmental Sciences & Ecology coral bleaching recovery capacity temperature variability Kimberley region Acropora aspera cryptic species TEMPERATURE-VARIATION WESTERN-AUSTRALIA CRYPTIC DIVERSITY HEAT TOLERANCE PATTERNS STRESS RESISTANCE |
| url | http://purl.org/au-research/grants/arc/LP160101508 http://hdl.handle.net/20.500.11937/90956 |