The 1997-98 El Niño event in Panama and Galápagos: An update of thermal stress indices relative to coral bleaching

Guillermo P Podesta, P. W. Glynn

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Associations were examined between warm sea surface temperature (SST) anomalies (mostly associated with the occurrence of warm El Niño - Southern Oscillation events) and coral bleaching in Academy Bay, Galápagos Is. and Naos Is., Gulf of Panama, in the tropical eastern Pacific Ocean. Various SST-related metrics potentially associated with bleaching occurrence were computed. These quantities suggested that the 1997-98 event, considered one of the strongest in recent history, was comparable in intensity to the strong 1982-83 event for the regions studied. Previously established 'bleaching conditions' (function of maximum annual SST values and a degree-days index) were shown to be valid for the 1997-98 ENSO event. In Galápagos, the 1997-98 metrics fell within the previously identified 'bleaching conditions' and bleaching indeed was observed (although not so severe as earlier and populations subsequently recovered). In the Gulf of Panama, the metrics' values were outside the range of bleaching conditions and no bleaching was detected. Lower coral mortality in Galápagos in 1997-98 may have been due in part to the timing of largest SST anomalies and to SST fluctuations in early 1998. Additionally, since current coral populations in the Galápagos have originated from coral survivors and their progeny following the 1982-83 disturbance, the presently-observed lower mortality rates may also have resulted from host/symbiont combinations more resistant to high temperatures.

Original languageEnglish
Pages (from-to)43-59
Number of pages17
JournalBulletin of Marine Science
Volume69
Issue number1
StatePublished - Nov 20 2001

Fingerprint

coral bleaching
thermal stress
bleaching
Panama
surface temperature
sea surface temperature
corals
coral
temperature anomaly
mortality
Southern Oscillation
symbiont
heat sums
Pacific Ocean
symbionts
El Nino-Southern Oscillation
index
oscillation
disturbance
history

ASJC Scopus subject areas

  • Aquatic Science
  • Oceanography

Cite this

The 1997-98 El Niño event in Panama and Galápagos : An update of thermal stress indices relative to coral bleaching. / Podesta, Guillermo P; Glynn, P. W.

In: Bulletin of Marine Science, Vol. 69, No. 1, 20.11.2001, p. 43-59.

Research output: Contribution to journalArticle

@article{ec53157d1f274d05853c4682af147e1f,
title = "The 1997-98 El Ni{\~n}o event in Panama and Gal{\'a}pagos: An update of thermal stress indices relative to coral bleaching",
abstract = "Associations were examined between warm sea surface temperature (SST) anomalies (mostly associated with the occurrence of warm El Ni{\~n}o - Southern Oscillation events) and coral bleaching in Academy Bay, Gal{\'a}pagos Is. and Naos Is., Gulf of Panama, in the tropical eastern Pacific Ocean. Various SST-related metrics potentially associated with bleaching occurrence were computed. These quantities suggested that the 1997-98 event, considered one of the strongest in recent history, was comparable in intensity to the strong 1982-83 event for the regions studied. Previously established 'bleaching conditions' (function of maximum annual SST values and a degree-days index) were shown to be valid for the 1997-98 ENSO event. In Gal{\'a}pagos, the 1997-98 metrics fell within the previously identified 'bleaching conditions' and bleaching indeed was observed (although not so severe as earlier and populations subsequently recovered). In the Gulf of Panama, the metrics' values were outside the range of bleaching conditions and no bleaching was detected. Lower coral mortality in Gal{\'a}pagos in 1997-98 may have been due in part to the timing of largest SST anomalies and to SST fluctuations in early 1998. Additionally, since current coral populations in the Gal{\'a}pagos have originated from coral survivors and their progeny following the 1982-83 disturbance, the presently-observed lower mortality rates may also have resulted from host/symbiont combinations more resistant to high temperatures.",
author = "Podesta, {Guillermo P} and Glynn, {P. W.}",
year = "2001",
month = "11",
day = "20",
language = "English",
volume = "69",
pages = "43--59",
journal = "Bulletin of Marine Science",
issn = "0007-4977",
publisher = "Rosenstiel School of Marine and Atmospheric Science",
number = "1",

}

TY - JOUR

T1 - The 1997-98 El Niño event in Panama and Galápagos

T2 - An update of thermal stress indices relative to coral bleaching

AU - Podesta, Guillermo P

AU - Glynn, P. W.

PY - 2001/11/20

Y1 - 2001/11/20

N2 - Associations were examined between warm sea surface temperature (SST) anomalies (mostly associated with the occurrence of warm El Niño - Southern Oscillation events) and coral bleaching in Academy Bay, Galápagos Is. and Naos Is., Gulf of Panama, in the tropical eastern Pacific Ocean. Various SST-related metrics potentially associated with bleaching occurrence were computed. These quantities suggested that the 1997-98 event, considered one of the strongest in recent history, was comparable in intensity to the strong 1982-83 event for the regions studied. Previously established 'bleaching conditions' (function of maximum annual SST values and a degree-days index) were shown to be valid for the 1997-98 ENSO event. In Galápagos, the 1997-98 metrics fell within the previously identified 'bleaching conditions' and bleaching indeed was observed (although not so severe as earlier and populations subsequently recovered). In the Gulf of Panama, the metrics' values were outside the range of bleaching conditions and no bleaching was detected. Lower coral mortality in Galápagos in 1997-98 may have been due in part to the timing of largest SST anomalies and to SST fluctuations in early 1998. Additionally, since current coral populations in the Galápagos have originated from coral survivors and their progeny following the 1982-83 disturbance, the presently-observed lower mortality rates may also have resulted from host/symbiont combinations more resistant to high temperatures.

AB - Associations were examined between warm sea surface temperature (SST) anomalies (mostly associated with the occurrence of warm El Niño - Southern Oscillation events) and coral bleaching in Academy Bay, Galápagos Is. and Naos Is., Gulf of Panama, in the tropical eastern Pacific Ocean. Various SST-related metrics potentially associated with bleaching occurrence were computed. These quantities suggested that the 1997-98 event, considered one of the strongest in recent history, was comparable in intensity to the strong 1982-83 event for the regions studied. Previously established 'bleaching conditions' (function of maximum annual SST values and a degree-days index) were shown to be valid for the 1997-98 ENSO event. In Galápagos, the 1997-98 metrics fell within the previously identified 'bleaching conditions' and bleaching indeed was observed (although not so severe as earlier and populations subsequently recovered). In the Gulf of Panama, the metrics' values were outside the range of bleaching conditions and no bleaching was detected. Lower coral mortality in Galápagos in 1997-98 may have been due in part to the timing of largest SST anomalies and to SST fluctuations in early 1998. Additionally, since current coral populations in the Galápagos have originated from coral survivors and their progeny following the 1982-83 disturbance, the presently-observed lower mortality rates may also have resulted from host/symbiont combinations more resistant to high temperatures.

UR - http://www.scopus.com/inward/record.url?scp=0034764782&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034764782&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0034764782

VL - 69

SP - 43

EP - 59

JO - Bulletin of Marine Science

JF - Bulletin of Marine Science

SN - 0007-4977

IS - 1

ER -