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Abstract
A 2007 earthquake in the western Solomon Islands resulted in a localised subsidence event in which sea level (relative to the previous coastal settings) rose approximately 30–70 cm, providing insight into impacts of future rapid changes to sea level on coastal ecosystems. Here, we show that increasing sea level by 30–70 cm can have contrasting impacts on mangrove, seagrass and coral reef ecosystems. Coral reef habitats were the clear winners with a steady lateral growth from 2006–2014, yielding a 157% increase in areal coverage over seven years. Mangrove ecosystems, on the other hand, suffered the largest impact through a rapid dieback of 35% (130 ha) of mangrove forest in the study area after subsidence. These forests, however, had partially recovered seven years after the earthquake albeit with a different community structure. The shallow seagrass ecosystems demonstrated the most dynamic response to relative shifts in sea level with both losses and gains in areal extent at small scales of 10–100 m. The results of this study emphasize the importance of considering the impacts of sea-level rise within a complex landscape in which winners and losers may vary over time and space.
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Details
1 School of Civil Engineering, The University of Queensland, St Lucia, QLD 4072, Australia; Author to whom any correspondence should be addressed.
2 School of Earth and Environmental Sciences, The University of Queensland, St Lucia, QLD 4072, Australia; The Global Change Institute, The University of Queensland, St Lucia, QLD 4072, Australia; Marine Spatial Ecology Lab and ARC Centre of Excellence for Reef Studies, School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia; Current address: School of Chemical Engineering, The University of Queensland, St. Lucia, QLD 4072, Australia
3 School of Earth and Environmental Sciences, The University of Queensland, St Lucia, QLD 4072, Australia
4 School of Science and Engineering, University of the Sunshine Coast, Maroochydore, DC Qld 4558, Australia
5 School of Civil Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
6 TropWATER Centre, James Cook University, Townsville, QLD 4811, Australia
7 The Global Change Institute, The University of Queensland, St Lucia, QLD 4072, Australia
8 Marine Spatial Ecology Lab and ARC Centre of Excellence for Reef Studies, School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia
9 School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia