Rising seas will drown mangrove forests

Mangrove forests around the Indo-Pacific region could be submerged by 2070, threatening fisheries, coastal protection and furthering climate change, researchers at the University of Queensland warn.

Even with relatively low sea-level rises, many mangrove forests had a poor outlook, said University of Queensland ecologist Professor Catherine Lovelock.

"Mangrove forests are particularly vulnerable," she said.

"Mangroves are predicted to be submerged in parts of Thailand, Sumatra, Java, Papua New Guinea and the Solomon Islands."

However the outlook in other parts of the world was more positive.

"Our modelling shows mangroves are likely to persist in east Africa, the Bay of Bengal, eastern Borneo and north-western Australia - areas where there are relatively large tidal ranges and/or higher sediment supply," said Professor Lovelock, who works in UQ's School of Biological Sciences and the Global Change Institute.

"Even in other areas though, the good news is that through accretion of sediment and maintenance of wetland soils, mangrove forests do have the capacity to avoid inundation and keep pace with sea-level rise."

Professor Lovelock said there was an urgent need to plan for the maintenance of sediment supply in river systems that were likely to be dammed or heavily modified in future.

"The Indo-Pacific region holds most of the world's mangrove forests, but sediment delivery in this region is declining, due to activities such as dam construction," she said.

"This is of particular concern as this region is expected to have variable but high rates of future sea-level rise."

Forest degradation had to be reversed because it reduced organic inputs to soils that was vital for mangrove survival, Professor Lovelock said.

Plans should be made for the landward migration of vulnerable mangrove forests to higher elevations.
 China.org.cn - china.org.cn
16/10/15
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