RESEARCH ARTICLE

Has climate change driven the Galapagos Damselfish, Azurina eupalama, to extinction?

Jack Stein Grove & Benjamin C. Victor

The endemic Galapagos Damselfish, Azurina eupalama, has not been seen since the historically large El Nino Southern Oscillation (ENSO) of 1982/3. Many observers and expeditions have attempted to find the species in the more than 4 decades since, but without success. Prior to 1982, the species had been regularly observed and numerous specimens were collected by almost all historical collecting expeditions conducted since the species was discovered in 1898. During ENSO events, the cessation of cold upwelling and high plankton productivity typical of normal years results in sustained periods of exceptionally warm water, reducing populations of cool-water fishes and severely affecting many other marine and terrestrial organisms. The endemic Galapagos Damselfish was an obligate planktivore, limited to the exposed shallow shorelines of the islands of the Galapagos (Ecuador), and adapted to cooler sea-surface temperatures, making the species especially vulnerable to extinction due to climate change and concomitant oceanographic perturbations. The Galapagos Damselfish, presently classified by the IUCN Red List as critically endangered/possibly extinct, should now be considered likely extinct. Future searches by sampling environmental DNA from Galapagos waters may be able to further confirm this tragic outcome of human-induced global climate change on this fragile and uniquely iconic World Heritage Site. .

CITATION:

Grove, J.S. & Victor, B.C. Has climate change driven the Galapagos Damselfish, Azurina eupalama, to extinction? Journal of the Ocean Science Foundation, 42, 7-14.

https://doi.org/10.5281/zenodo.14846312

publication date: 12 February 2025