Wetenschap - 13 mei 2019

Three-quarters of coral around Curaçao and Bonaire gone

tekst:
Roelof Kleis

Over the last forty years, the coral reefs around Curaçao and Bonaire have been decimated. This was the revealed by research carried out by PhD candidate Didier de Bakker.

© Erik Meesters

For his PhD research in the Aquatic Ecology and Water Quality Management group, De Bakker analysed a forty-year-spanning photo series of sixteen pieces of reef. Those three-by-three-metre quadrants were first photographed in 1973 and have been captured almost every year since.

Cyanobacteria
De Bakkers’ analysis shows that the coral has been largely repressed by turf algae, macroalgae and cyanobacteria. The main cause of this is pollution. De Bakker: ‘Pollution enriches the water with nutrients. That is good news for algae and other organisms, which can grow quickly with more nutrients. But corals are at their strongest in poor conditions. Pollution therefore weakens their competitive position.’

Read the interview with Didier de Bakker:


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