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Decadal erosion of coral assemblages by multiple disturbances in the Palm Islands, central Great Barrier Reef
Torda, G.; Sambrook, K.; Cross, P.; Sato, Y.; Bourne, D.G.; Lukoschek, V.; Torras Jorda, G.; Moya, A.; Willis, B.L. (2018). Decadal erosion of coral assemblages by multiple disturbances in the Palm Islands, central Great Barrier Reef. NPG Scientific Reports 8(1): 10 pp. https://dx.doi.org/10.1038/s41598-018-29608-y
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322
|   |
| Auteurs | | Top |
- Torda, G.
- Sambrook, K.
- Cross, P.
|
- Sato, Y.
- Bourne, D.G.
- Lukoschek, V.
|
- Torras Jorda, G.
- Moya, A.
- Willis, B.L.
|
| Abstract |
Increases in the frequency of perturbations that drive coral community structure, such as severe thermal anomalies and high intensity storms, highlight the need to understand how coral communities recover following multiple disturbances. We describe the dynamics of cover and assemblage composition of corals on exposed inshore reefs in the Palm Islands, central Great Barrier Reef, over 19 years encapsulating major disturbance events such as the severe bleaching event in 1998 and Cyclone Yasi in 2011, along with other minor storm and heat stress events. Over this time, 47.8% of hard coral cover was lost, with a concomitant shift in coral assemblage composition due to taxon-specific rates of mortality during the disturbances, and asymmetric recovery in the aftermath thereof. High recruitment rates of some broadcast-spawning corals, particularly corymbose Acropora spp., even in the absence of adult colonies, indicate that a strong external larval supply replenished the stocks. Conversely, the time required for recovery of slow-growing coral morphologies and life histories was longer than the recurrence times of major disturbances. With interludes between bleaching and cyclones predicted to decrease, the probability of another severe disturbance event before coral cover and assemblage composition approximates historical levels suggests that reefs will continue to erode. |
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