FN Archimer Export Format
PT J
TI Negative sea level anomalies with extreme low tides in the South-West Indian Ocean shape Reunion Island’s fringing coral reef flats
BT 
AF Hoarau, Ludovic
   Mouquet, Pascal
   Ropert, Michel
   Cuvillier, Alexis
   Massé, Lola
   Bonhommeau, Sylvain
   Bigot, Lionel
   Cauvin, Bruce
   Pothin, Karine
   Bajjouk, Touria
AS 1:1,2,3;2:4;3:5;4:1,3;5:6,7;6:2;7:3;8:7;9:7;10:8;
FF 1:PDG-RBE-DOI;2:;3:PDG-ODE-LITTORAL-LERN;4:;5:;6:PDG-RBE-DOI;7:;8:;9:;10:PDG-ODE-DYNECO-LEBCO;
C1 3R: Rehabilitation of Reunion Island Reef, Saint-Gilles Les Hauts, La Réunion, France
   IFREMER Délégation Océan Indien, Rue Jean Bertho, 97822 Le Port, La Réunion, France
   UMR ENTROPIE, Université de la Réunion, IRD, CNRS, IFREMER, Université de la Nouvelle-Calédonie, France
   Espace-Dev, IRD, Université de Montpellier, Université de Guyane, Université de La Réunion, Université des Antilles, Université de la Nouvelle Calédonie, Saint-Denis, La Réunion, France
   IFREMER LER/N, Avenue du Général de Gaulle – BP 32, 14520 Port en Bessin, France
   IRD La Réunion, CS 41095, 2 rue Joseph Wetzell, Parc Technologique Universitaire, 97435 Sainte-Clotilde, La Réunion, France
   GIP Réserve Nationale Marine de La Réunion, 39 Rue du Lagon, Dayot 1, 97434 La Saline les-Bains, La Réunion, France
   IFREMER Centre de Brest, DYNECO/LEBCO, BP 70, 29280 Plouzané, France
C2 3R REHABILITATION REUNION ISLAND REEF, FRANCE
   IFREMER, FRANCE
   UNIV LA REUNION, FRANCE
   IRD, FRANCE
   IFREMER, FRANCE
   IRD, FRANCE
   RESERVE NAT MARINE LA REUNION, FRANCE
   IFREMER, FRANCE
SI LA REUNION
   PORT-EN-BESSIN
   BREST
SE PDG-RBE-DOI
   PDG-ODE-LITTORAL-LERN
   PDG-ODE-DYNECO-LEBCO
UM ENTROPIE
IN WOS Ifremer UPR
   WOS Ifremer UMR
   WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-p187
   copubli-univ-france
IF 6.9
TC 0
UR https://archimer.ifremer.fr/doc/00843/95494/103312.pdf
   https://archimer.ifremer.fr/doc/00843/95494/103313.jpg
   https://archimer.ifremer.fr/doc/00843/95494/103314.jpg
   https://archimer.ifremer.fr/doc/00843/95494/103315.jpg
   https://archimer.ifremer.fr/doc/00843/95494/103316.jpg
   https://archimer.ifremer.fr/doc/00843/95494/103317.jpg
   https://archimer.ifremer.fr/doc/00843/95494/103318.docx
LA English
DT Article
DE ;Sea level anomalies;Low tides;Aerial exposure;Coral mortality;Reunion Island;South -West Indian Ocean
AB Among induced mass-mortality events on coral reef, extreme low tides may ultimately lead to considerable reef community deaths on intertidal reef flats due to unusually long and significant aerial exposure. Here, we report an extensive coral mortality event induced by a negative sea level anomaly (nSLA) that occurred across Reunion Island during the austral winter season between June and October 2015 preceding the 2015–2016 El Niño Southern Oscillation (ENSO) event. The nSLA was strong and long in duration with a rapid drop of 35 cm in the mean sea level over a one-month period. Surveys conducted over seven reef flat sites before and after the nSLA revealed that mean coral cover drastically decreased from 54.5 ± 12.7% in early 2015, to 27.4 ± 6.9% in November 2015, which is an equivalent cover loss of 50% following the 2015 nSLA event. The shallowest sites showed a greater decrease in coral cover while the deepest parts of the reef flat remained unaffected. We found a significant correlation between the bathymetry and the relative coral cover variation. Using this relationship between depth and coral cover changes, high-resolution hyperspectral imagery and Lidar bathymetric airborne data, we mapped the impacts of this event at the scale of the whole reef. Overall the modeled loss reached 13.0 ha, which represents a decrease of 45.5% of all live coral cover in this area during the 2015 nSLA event. The impact of a nSLA on emersion times is much greater than the regular variation in tide amplitude between neap and spring tides, reaching new bathymetric ranges that are usually stable in terms of water submersion. Temporal variation of coral cover on Reunion Island reef flat revealed regular decreases to be compared with mean low-water-level events among other sea and climatic related disturbances and stressors. 
PY 2023
PD OCT
SO Ecological Indicators
SN 1470-160X
PU Elsevier BV
VL 154
UT 001039279200001
DI 10.1016/j.ecolind.2023.110508
ID 95494
ER

EF