Coral reef recovery in the Galápagos Islands: the northernmost islands (Darwin and Wenman)

Peter W. Glynn, Bernhard Riegl, Samuel Purkis, Jeremy M. Kerr, Tyler B. Smith

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The remote northernmost Galápagos Islands, Darwin and Wenman, exhibited well-developed coral communities in 1975, which were severely degraded during the 1982–1983 El Niño warming event. Mapping of the coral reef at Darwin, herein Wellington Reef, shows it presently to be the largest known structural reef in the Galápagos. It consists of numerous 1- to 3-m-high Porites framework towers or stacks and overlies a carbonate (coral/calcareous sediments) basement. Pre-disturbance Wellington Reef was constructed chiefly by Porites lobata and Pocillopora elegans, and Wenman coral cover was dominated by Pavona clavus and Porites lobata. Subsequent surveys in 2012 have demonstrated robust recovery in spite of ENSO thermal shock events, involving both high and low stressful temperatures that have caused tissue bleaching and mortality. No losses of coral species have been observed. Radiocarbon dating of 1- to 3-m-high poritid framework stacks, from their peaks to bases, revealed modern ages of up to 690 yr. Incremental stack growth rates ranged from 0.15–0.39 to 1.04–2.40 cm yr−1. The former are equivalent to framework accretion rates of 1.5–3.9 m Kyr−1, the latter to coral skeletal growth rates of 1.0–2.4 cm yr−1. Coral recovery in the central and southern Galápagos has been nonexistent to low compared with the northern islands, due chiefly to much higher population densities and destructive grazing pressure of the echinoid Eucidaris galapagensis. Thus, coral reef resistance to ENSO perturbations and recovery potential in the Galápagos are influenced by echinoid bioerosion that varies significantly among islands.

Original languageEnglish
JournalCoral Reefs
DOIs
StateAccepted/In press - Mar 5 2015

Fingerprint

coral reefs
coral reef
corals
coral
reefs
reef
El Nino-Southern Oscillation
bioerosion
radiocarbon dating
grazing pressure
bleaching
carbonates
heat stress
population density
warming
accretion
perturbation
grazing
disturbance
carbonate

Keywords

  • Echinoid bioerosion
  • ENSO thermal bleaching
  • Galápagos coral recovery
  • Reef accretion

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Coral reef recovery in the Galápagos Islands : the northernmost islands (Darwin and Wenman). / Glynn, Peter W.; Riegl, Bernhard; Purkis, Samuel; Kerr, Jeremy M.; Smith, Tyler B.

In: Coral Reefs, 05.03.2015.

Research output: Contribution to journalArticle

Glynn, Peter W. ; Riegl, Bernhard ; Purkis, Samuel ; Kerr, Jeremy M. ; Smith, Tyler B. / Coral reef recovery in the Galápagos Islands : the northernmost islands (Darwin and Wenman). In: Coral Reefs. 2015.
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AB - The remote northernmost Galápagos Islands, Darwin and Wenman, exhibited well-developed coral communities in 1975, which were severely degraded during the 1982–1983 El Niño warming event. Mapping of the coral reef at Darwin, herein Wellington Reef, shows it presently to be the largest known structural reef in the Galápagos. It consists of numerous 1- to 3-m-high Porites framework towers or stacks and overlies a carbonate (coral/calcareous sediments) basement. Pre-disturbance Wellington Reef was constructed chiefly by Porites lobata and Pocillopora elegans, and Wenman coral cover was dominated by Pavona clavus and Porites lobata. Subsequent surveys in 2012 have demonstrated robust recovery in spite of ENSO thermal shock events, involving both high and low stressful temperatures that have caused tissue bleaching and mortality. No losses of coral species have been observed. Radiocarbon dating of 1- to 3-m-high poritid framework stacks, from their peaks to bases, revealed modern ages of up to 690 yr. Incremental stack growth rates ranged from 0.15–0.39 to 1.04–2.40 cm yr−1. The former are equivalent to framework accretion rates of 1.5–3.9 m Kyr−1, the latter to coral skeletal growth rates of 1.0–2.4 cm yr−1. Coral recovery in the central and southern Galápagos has been nonexistent to low compared with the northern islands, due chiefly to much higher population densities and destructive grazing pressure of the echinoid Eucidaris galapagensis. Thus, coral reef resistance to ENSO perturbations and recovery potential in the Galápagos are influenced by echinoid bioerosion that varies significantly among islands.

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