Successive marine heatwaves cause disproportionate coral bleaching during a fast phase transition from El Niño to La Niña.

Autor: Dalton SJ; Australian Research Council Centre of Excellence for Coral Reef Studies, School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia; National Marine Science Centre, Southern Cross University, PO Box 4321, Coffs Harbour, NSW 2450, Australia. Electronic address: sjdalts@gmail.com., Carroll AG; Marine Ecology Research Centre, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia; National Earth and Marine Observations Branch, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia., Sampayo E; Australian Research Council Centre of Excellence for Coral Reef Studies, School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia., Roff G; Australian Research Council Centre of Excellence for Coral Reef Studies, School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia., Harrison PL; Marine Ecology Research Centre, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia., Entwistle K; Marine Ecology Research Centre, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia., Huang Z; National Earth and Marine Observations Branch, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia., Salih A; Western Sydney University, Confocal Bio-Imaging Facility, Hawkesbury Campus, PO Box 1797, Penrith, NSW 2751, Australia., Diamond SL; Western Sydney University, School of Science and Health, Hawkesbury Campus, Box 1797, Penrith, NSW 2751, Australia.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2020 May 01; Vol. 715, pp. 136951. Date of Electronic Publication: 2020 Jan 28.
DOI: 10.1016/j.scitotenv.2020.136951
Abstrakt: The frequency and intensity of marine heatwaves that result in coral bleaching events have increased over recent decades and led to catastrophic losses of reef-building corals in many regions. The high-latitude coral assemblages at Lord Howe Island, which is a UNESCO listed site is the world southernmost coral community, were exposed to successive thermal anomalies following a fast phase-transition of the record-breaking 2009 to 2010 warm pool El Niño in the Central Pacific to a strong La Niña event in late 2010. The coral community experienced severe and unprecedented consecutive bleaching in both 2010 and 2011. Coral health surveys completed between March 2010 and September 2012 quantified the response and recovery of approximately 43,700 coral colonies to these successive marine heatwaves. In March 2010, coral bleaching ranged from severe, with 99% of colonies bleached at some shallow lagoon sites, to mild at deeper reef slope sites, with only 17% of individuals affected. Significant immediate mortality from thermal stress was evident during the peak of the bleaching event. Overall, species in the genera Pocillopora, Stylophora, Seriatopora and Porites were the most affected, while minimal bleaching and mortality was recorded among members of other coral families (e.g. Acroporidae, Dendrophyllidae & Merulinidae). Surviving corals underwent a subsequent, but much less intense, thermal anomaly in 2011 that led to a disproportionate bleaching response among susceptible taxa. While this observation indicates that the capacity of thermally susceptible high-latitude corals to acclimatize to future ocean warming may be limited, particularly if bleaching events occur annually, our long-term survey data shows that coral cover at most sites recovered to pre-bleaching levels within three years in the absence of further thermal anomalies.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Crown Copyright © 2020. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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