This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Mangrove forests, which are widespread along subtropical and tropical coasts, play a vital role in coastal protection, as they dampen the force of waves and storm surges. They also naturally store carbon in the soil and are home to a wide variety of living organisms.
Large sums of money are being invested worldwide to protect and restore mangrove forests. However, these projects often fail because accompanying studies on optimal environmental conditions generally take only average values into account, explains Dr. Will Glamore from the Water Research Laboratory at the University of New South Wales (UNSW) in Sydney, Australia.
What is far more crucial for the trees to establish themselves is that certain thresholds—for example, in wave action—are not exceeded. The study's findings show "how short periods of ideal conditions can play a decisive role in enabling mangroves to establish themselves and develop," says the environmental engineer. The findings are published in the journal Nature.
Thorsten Balke, a vegetation ecologist at the University of Oldenburg, together with researchers from Europe and Southeast Asia, had found evidence of the conditions under which a mangrove seedling can begin to grow in shallow coastal areas influenced by tides and waves. "At the time, we defined a 'favorable window of opportunity,'" explains Balke. Only during a specific period are the conditions such that the seedling can take root and subsequently become firmly anchored.
Otherwise, during the next high tide, waves, currents and sediment resuspension could uproot the young plant. The international team has put this knowledge to use in the current study. They analyzed 20 years' worth of wave data from around 400 locations worldwide, half of which had mangroves and half of which did not.
From this global data analysis, they developed a model of wave exposure and combined it with the concept of "windows of opportunity" developed by Balke through experiments. The team was thus able to correctly predict the presence or absence of mangroves at over 75% of the sites studied. The results show that sites with mangroves experience longer periods of low wave energy more frequently than coasts without mangroves.
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