Corals breathe through an invisible machinery of cilia, microscopic hair-like structures whose coordinated beating drives fluid across the animal's surface to deliver oxygen and carry away waste. A University of Manchester-led study with the Universities of Melbourne and Copenhagen, published in PRX Life with Siluvai Antony Selvan as lead author, combined high-resolution imaging, flow measurements and mathematical modelling to decode how those flows actually work.
The counterintuitive headline is that disorder helps. For slowly diffusing substances, heterogeneous orientation in the beating direction of individual cilia increased transport by more than 50 per cent compared with perfectly aligned cilia. Variation, it turns out, stirs the boundary layer more effectively than uniformity. The team also found that strong external flows, such as ocean currents, reduce the coral's ability to exchange materials near its surface, a finding with implications for how reefs cope in changing seas.
The framework travels well beyond the reef. Human airways and fallopian tubes rely on the same ciliary machinery, and the researchers suggest their models could be used to study how cilia dysfunction contributes to disease, including respiratory conditions, infertility and ovarian cancer. It is a neat example of ocean biophysics feeding directly into biomedical hypothesis-building.