Smith et al. 2014

scientific article | Ecology | open access Open access small aa108fa7f478951c693af64a05bc4b46e6711dbb69a20809512a129d4d6b870f

A depth refugium from catastrophic coral bleaching prevents regional extinction

Smith TB, Glynn PW, Maté JL, Toth LT, Gyory J

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Species intolerant of changing climate might avoid extinction within refugia buffered from extreme conditions. Refugia have been observed in the fossil record but are not well documented or understood on ecological time scales. Using a 37-year record from the eastern Pacific across the two most severe El Niño events on record (1982–1983 and 1997–1998) we show how an exceptionally thermally sensitive reef-building hydrocoral, Millepora intricata, twice survived catastrophic bleaching in a deeper-water refuge (>11 m depth). During both events, M. intricata was extirpated across its range in shallow water, but showed recovery within several years, while two other hydrocorals without deep-water populations were driven to regional extinction. Evidence from the subfossil record in the same area showed shallow-water persistence of abundant M. intricata populations from 5000 years ago, through severe El Niño–Southern Oscillation cycles, suggesting a potential depth refugium on a millennial timescale. Our data confirm the deep refuge hypothesis for corals under thermal stress.

Research sites

10.1890   13 0468.1
Depth range
1- 25 m

Mesophotic “mentions”
3 x (total of 5861 words)

Ecology Connectivity Paleoecology

Research focus

Panama - Pacific Ocean

Research platforms
Diving (unspecified)
Author profiles
Tyler Smith ( 20 pubs)