The voice of eelgrass
Wade out into the shallows of Puget Sound on a warm, sunny day and put your ear close to the water. You might catch the faint, champagne-like bubbling of eelgrass.
Take a listen to an underwater recording of eelgrass made at the Padilla Bay National Estuarine Research Reserve. A hydrophone captures the sound of oxygen bubbling from the plant's leaves as it absorbs and photosynthesizes the sun's rays.
Eelgrass is one of the linchpins of the Puget Sound ecosystem, providing key habitat for species like shellfish and juvenile salmon. Scientists compare its importance to that of old-growth or tropical forests because of the variety and number of species that depend on it, and the plant is so vibrant that you can actually hear it "breathing." This respiration also makes eelgrass and other seagrasses exceptional "carbon sinks" for greenhouse gasses. A study published in 2012 in the journal Nature shows that seagrass meadows absorb massive amounts of carbon from the atmosphere—even more than terrestrial forests.
Recorded by Jeff Rice with support from the Acoustic Atlas at Montana State University. Special thanks to Si Simenstad, Ron Thom, Katie Harrington and the staff of the Padilla Bay National Estuarine Research Reserve for their advice on this recording.
