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Insights into deadly coral bleaching could help preserve reefs
Date:4/23/2013

Coral reefs are stressed the world over and could be in mortal danger because of climate change. But why do some corals die and others not, even when exposed to the same environmental conditions?

An interdisciplinary research team from Northwestern University and The Field Museum of Natural History has a surprising answer: The corals themselves play a role in their susceptibility to deadly coral bleaching due to the light-scattering properties of their skeletons. No one else has shown this before.

Using optical technology designed for early cancer detection, the researchers discovered that reef-building corals scatter light in different ways to the symbiotic algae that feed the corals. Corals that are less efficient at light scattering retain algae better under stressful conditions and are more likely to survive. Corals whose skeletons scatter light most efficiently have an advantage under normal conditions, but they suffer the most damage when stressed.

The findings could help predict the response of coral reefs to the stress of increasing seawater temperatures and acidity, helping conservation scientists preserve coral reef health and high biodiversity.

The study of nearly a hundred different species of reef-building corals, including many from the 1893 World's Fair in Chicago, was published this week in PLOS ONE. The open-access, online journal is published by The Public Library of Science.

"We have solved a little piece of the puzzle of why coral reefs are bleaching and dying," said Luisa A. Marcelino, who led the study. "Our research is the first to show light-scattering properties of the corals are a risk factor."

Marcelino is a molecular biologist and research assistant professor of civil and environmental engineering at Northwestern.

The unusual research involved marine biology, the physics of light transport, the biophysics of how corals handle light and unique technology originally
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Contact: Megan Fellman
fellman@northwestern.edu
847-491-3115
Northwestern University
Source:Eurekalert

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