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Scientists use satellites to protect coral reefs

NCEO Scientists at Plymouth Marine Laboratory have been using satellite data to understand how coral reefs are being affected by climate change.

Climate change, ocean acidification and a range of human activities are all affecting these fragile ecosystems. Resilience to these threats is stronger when the reefs are better connected, sharing a flow of life and genes between them that helps to maintain healthier populations, but such connections are not easy to identify. By bringing together satellite observations, genetic population data and model simulations, a team led by Plymouth Marine Laboratory (PML) scientists and funded by NCEO has now traced this connectivity. Dynamic circulation features in the Red Sea, such as eddies and currents, form pathways along which marine life can flow. And at the source of these pathways are invaluable ‘mother reefs’ spreading life to other Red Sea reefs. These ‘mother reefs’ are perhaps the most important reefs of all when considering management and conservation strategies, suggests lead author Dionysios Raitsos, of PML.

“Essentially, these reefs are ‘population donors’, enhancing gene flow around the Red Sea, and their conservation should be prioritised over other reefs,” said Raitsos.

Initial conclusions were based on the connectivity between reefs observed from satellites in space. To establish if these findings had any real ecological substance, the team tested the results against the genetics of the Red Sea’s anemonefish (Amphiprion bicinctus) population. The predictions of connectivity were remarkably consistent with population data, demonstrating how currents and circulation form pathways for larval stages of marine life around the Red Sea.

Connectivity models often require costly approaches and data that are difficult to collect. This research instead showcases a cost-effective tool and method, using freely available satellite data-sets to enable the estimation of connectivity remotely, and guide more effective management of waters where oceanographic information may be in short supply.

“Discovering how coral reefs are connected and how water circulation in the Red Sea carries life to distant reefs is vital in furthering our understanding of these vulnerable ecosystems,” said Raitsos. “Our findings and cost-effective approach can benefit conservation and management efforts on coral reefs around the world.”

Their work has been published in Scientific Reports
and highlighted in New Scientist

This article first appeared on the Plymouth Marine Laboratory website

Coral Reef and Clown Fish photographed by Dionysis Raitsos
images of the surface flow connecting reefs between Africa and Arabian Peninsula