科学家利用水下扬声器模仿健康礁的声音，吸引鱼类重建生态系统
A healthy coral reef is never silent. Drop a hydrophone into its turquoise waters and you will hear a crackling symphony: the persistent snap of pistol shrimp, the low grunts of passing fish, and the scratch of sea urchins scraping algae from limestone. This underwater racket is not random noise, but a vital signal that guides tiny larval fish across the open ocean to their future home. When a reef bleaches and dies, however, that soundscape fades into a hollow quiet—and with it, the reef’s ability to call its inhabitants back.
For years, marine ecologists suspected that reef noise played a navigational role, but only recently have they proven the phenomenon experimentally. Working on rubble patches in the northern Great Barrier Reef and the Philippines, scientists set up underwater speaker systems beside degraded sites. At half the patches, they broadcast recordings of a vibrant reef—snaps, croaks and all—while the other patches remained silent. The results, published in prominent journals, were striking: the noisy sites attracted twice as many juvenile fish and 50% more species within just six weeks.
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