‘Invisible Coral Flows’ photograph wins NSF/AAAS scientific visualization competition

February 6, 2014

By Denise Brehm
Civil & Environmental Engineering

Seeking to make the invisible visible, scientists in Professor Roman Stocker’s lab used video microscopy to reveal the path of water as it flows around coral. The resulting image, “Invisible Coral Flows,” is winner in the photography category of the 2013 International Science and Engineering Visualization Challenge, sponsored by the National Science Foundation (NSF) and the American Association for the Advancement of Science, and appears on the cover of the Feb. 7 issue of Science.

Invisible Coral Flows.
“Invisible Coral Flows." Photo / Vicente I. Fernandez, Orr H. Shapiro, Melissa S. Garren, Assaf Vardi and Roman Stocker. View the image in a larger size.

In his research, Stocker, an associate professor in the Department of Civil and Environmental Engineering, uses microfluidics and imaging to document and quantify the often overlooked dynamic roles played by ocean microbes, coral and other marine life forms whose individual impacts at the small scale may profoundly affect ocean health and biogeochemical cycles at larger scales.

“Seeing and sharing what are otherwise ‘invisible’ environmental processes by directly capturing them through microscale photography is not only very gratifying, but also opens the door to a deeper understanding of these processes and how they affect whole ecosystems, like, in this case, coral reefs,” says Stocker. “When we saw these flows that the corals generate, and how effectively they allow the corals to mix their surroundings, we were stunned.”

Working in Stocker’s Environmental Microfluidics Lab, postdoc Vicente Fernandez and former postdoc Orr Shapiro (now at the Weizmann Institute of Science in Israel) created the winning image as part of a study on how corals engineer their environment.

Fernandez and Shapiro placed Pocillopora damicornis coral in seawater containing tiny nutrient particles, and put this under the lens of a microscope. They used video to capture the slight movement of two coral polyps (each about a millimeter in size) and the dynamic flow of particles in the water around them over a one-and-a-half-hour period.

Fernandez superimposed information from the short video clips at the beginning and end of the experiment to create a single image showing the coral’s movement