Journal
GEOLOGY
Volume 34, Issue 11, Pages 949-952Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G22814A.1
Keywords
coral reefs; disturbance; Quaternary; mass mortality; Holocene; Papua New Guinea
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Funding
- Natural Environment Research Council [NER/T/S/2002/00982, NER/T/S/2002/00443] Funding Source: researchfish
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The frequency and intensity of disturbance on living coral reefs have been accelerating for the past few decades, resulting in a changed seascape. What is unclear but vital for management is whether this acceleration is natural or coincident only with recent human impact. We surveyed nine uplifted early to mid-Holocene (11,000-3700 calendar [cal] yr B.P.) fringing and barrier reefs along similar to 27 km at the Huon Peninsula, Papua New Guinea. We found evidence for several episodes of coral mass mortality, but frequency was < 1 in 1500 yr. The most striking mortality event extends > 16 km along the ancient coastline, occurred ca. 9100-9400 cal yr B.P., and is associated with a volcanic ash horizon. Recolonization of the reef surface and resumption of vertical reef accretion was rapid (< 100 yr), but the post-disturbance reef communities contrasted with their pre-disturbance counterparts. Assessing the frequency, nature, and long-term ecological consequences of mass-mortality events in fossil coral reefs may provide important insights to guide management of modern reefs in this time of environmental degradation and change.
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