Temperature patterns and mechanisms influencing coral bleaching during the 2016 El Niño
Tim R. McClanahan
(1)
,
Emily S. Darling
(1, 2)
,
Joseph M. Maina
(3)
,
Nyawira Muthiga
(1)
,
Stephanie D’agata
,
Stacy Jupiter
(4)
,
Rohan Arthur
(5)
,
Shaun Wilson
,
Sangeeta Mangubhai
(1)
,
Yashika Nand
(1)
,
Ali Ussi
,
Austin Humphries
,
Vardhan Patankar
(1, 6)
,
Mireille Guillaume
(7, 8)
,
Sally Keith
,
George Shedrawi
,
Pagu Julius
,
Gabriel Grimsditch
(9)
,
January Ndagala
,
Julien Leblond
(10)
1
WCS -
Wildlife Conservation Society
2 EEB - Department of Ecology and Evolutionary Biology [University of Toronto]
3 Macquarie University [Sydney]
4 UHM - University of Hawai‘i [Mānoa]
5 CEAB - Centre d'Estudis Avançats de Blanes
6 Tata Institute of Fundamental Research [Bangalore]
7 BOREA - Biologie des Organismes et Ecosystèmes Aquatiques
8 LabEX CORAIL - Laboratoire d'Excellence CORAIL
9 IUCN - International Union for Conservation of Nature
10 IRD - Institut de Recherche pour le Développement
2 EEB - Department of Ecology and Evolutionary Biology [University of Toronto]
3 Macquarie University [Sydney]
4 UHM - University of Hawai‘i [Mānoa]
5 CEAB - Centre d'Estudis Avançats de Blanes
6 Tata Institute of Fundamental Research [Bangalore]
7 BOREA - Biologie des Organismes et Ecosystèmes Aquatiques
8 LabEX CORAIL - Laboratoire d'Excellence CORAIL
9 IUCN - International Union for Conservation of Nature
10 IRD - Institut de Recherche pour le Développement
Nyawira Muthiga
- Fonction : Auteur
- PersonId : 1210242
- ORCID : 0000-0003-3278-7410
Stephanie D’agata
- Fonction : Auteur
- PersonId : 745178
- IdHAL : stephanie-dagata
- ORCID : 0000-0001-6941-8489
Stacy Jupiter
- Fonction : Auteur
- PersonId : 794915
- ORCID : 0000-0001-9742-1677
- IdRef : 174229410
Shaun Wilson
- Fonction : Auteur
Sangeeta Mangubhai
- Fonction : Auteur
- PersonId : 808346
- ORCID : 0000-0002-4728-4421
Ali Ussi
- Fonction : Auteur
Austin Humphries
- Fonction : Auteur
- PersonId : 1210243
- ORCID : 0000-0002-6071-6874
Vardhan Patankar
- Fonction : Auteur
- PersonId : 1210244
- ORCID : 0000-0002-9088-4537
Mireille Guillaume
- Fonction : Auteur
- PersonId : 176471
- IdHAL : mireille-guillaume
- ORCID : 0000-0001-7249-0131
- IdRef : 033827648
Sally Keith
- Fonction : Auteur
- PersonId : 1210245
- ORCID : 0000-0002-9634-2763
George Shedrawi
- Fonction : Auteur
- PersonId : 1210246
- ORCID : 0000-0002-4507-7293
Pagu Julius
- Fonction : Auteur
January Ndagala
- Fonction : Auteur
Résumé
Under extreme heat stress, corals expel their symbiotic algae and colour (that is, ‘bleaching’), which often leads to widespread mortality. Predicting the large-scale environmental conditions that reinforce or mitigate coral bleaching remains unresolved and limits strategic conservation actions1,2. Here we assessed coral bleaching at 226 sites and 26 environmental variables that represent different mechanisms of stress responses from East Africa to Fiji through a coordinated effort to evaluate the coral response to the 2014–2016 El Niño/Southern Oscillation thermal anomaly. We applied common time-series methods to study the temporal patterning of acute thermal stress and evaluated the effectiveness of conventional and new sea surface temperature metrics and mechanisms in predicting bleaching severity. The best models indicated the importance of peak hot temperatures, the duration of cool temperatures and temperature bimodality, which explained ~50% of the variance, compared to the common degree-heating week temperature index that explained only 9%. Our findings suggest that the threshold concept as a mechanism to explain bleaching alone was not as powerful as the multidimensional interactions of stresses, which include the duration and temporal patterning of hot and cold temperature extremes relative to average local conditions.
Domaines
Sciences du Vivant [q-bio]Format du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Résumé |
en
Under extreme heat stress, corals expel their symbiotic algae and colour (that is, ‘bleaching’), which often leads to widespread mortality. Predicting the large-scale environmental conditions that reinforce or mitigate coral bleaching remains unresolved and limits strategic conservation actions1,2. Here we assessed coral bleaching at 226 sites and 26 environmental variables that represent different mechanisms of stress responses from East Africa to Fiji through a coordinated effort to evaluate the coral response to the 2014–2016 El Niño/Southern Oscillation thermal anomaly. We applied common time-series methods to study the temporal patterning of acute thermal stress and evaluated the effectiveness of conventional and new sea surface temperature metrics and mechanisms in predicting bleaching severity. The best models indicated the importance of peak hot temperatures, the duration of cool temperatures and temperature bimodality, which explained ~50% of the variance, compared to the common degree-heating week temperature index that explained only 9%. Our findings suggest that the threshold concept as a mechanism to explain bleaching alone was not as powerful as the multidimensional interactions of stresses, which include the duration and temporal patterning of hot and cold temperature extremes relative to average local conditions.
|
Titre |
en
Temperature patterns and mechanisms influencing coral bleaching during the 2016 El Niño
|
Auteur(s) |
Tim R. McClanahan
1
, Emily S. Darling
1, 2
, Joseph M. Maina
3
, Nyawira Muthiga
1
, Stephanie D’agata
, Stacy Jupiter
4
, Rohan Arthur
5
, Shaun Wilson
, Sangeeta Mangubhai
1
, Yashika Nand
1
, Ali Ussi
, Austin Humphries
, Vardhan Patankar
1, 6
, Mireille Guillaume
7, 8
, Sally Keith
, George Shedrawi
, Pagu Julius
, Gabriel Grimsditch
9
, January Ndagala
, Julien Leblond
10
1
WCS -
Wildlife Conservation Society
( 566215 )
- 2300 Southern Blvd, Bronx, NY 10460, USA
- États-Unis
2
EEB -
Department of Ecology and Evolutionary Biology [University of Toronto]
( 55629 )
- 25 Willcocks Street Toronto, Ontario M5S 3B2
- Canada
3
Macquarie University [Sydney]
( 539566 )
- Sydney, NSW, 2109, Australia
- Australie
4
UHM -
University of Hawai‘i [Mānoa]
( 529665 )
- 1890 East-West Rd, Honolulu, HI 96822
- États-Unis
5
CEAB -
Centre d'Estudis Avançats de Blanes
( 64460 )
- C/ d'accés a la Cala St. Francesc, 14. Blanes. Girona. E-17300 (ESPAÑA)
- Espagne
6
Tata Institute of Fundamental Research [Bangalore]
( 1051078 )
- Homi Bhabha Road, Colaba - Mumbai 400005, Inde
- Inde
7
BOREA -
Biologie des Organismes et Ecosystèmes Aquatiques
( 542153 )
- Muséum national d'Histoire naturelle - 7, rue Cuvier - CP 32 - 75231 Paris Cedex 05
- France
8
LabEX CORAIL -
Laboratoire d'Excellence CORAIL
( 209113 )
- 58 avenue Paul Alduy 66860 Perpignan CEDEX - Tél. : 04 30 19 23 32 - contact@labex-corail.fr
- France
9
IUCN -
International Union for Conservation of Nature
( 246917 )
- Suisse
10
IRD -
Institut de Recherche pour le Développement
( 67872 )
- Siège
Le Sextant
44, bd de Dunkerque
CS 90009
13572 Marseille cedex 02
- France
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Langue du document |
Anglais
|
Nom de la revue |
|
Date de publication |
2019-11
|
Volume |
9
|
Numéro |
11
|
Page/Identifiant |
845-851
|
Domaine(s) |
|
DOI | 10.1038/s41558-019-0576-8 |
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