Jellyfishes rely on drifting to eat. They take their luck with currents, and create tiny eddies to guide food toward their tendrils. Yet in waters from the Sea of Japan to the Black Sea, jellies today are thriving as many of their marine vertebrate and invertebrate competitors are eliminated by overfishing, dead zones and other human impacts. How have these drifters of the sea reversed millions of years of fish dominance, seemingly overnight?
Biologist José Luis Acuña of the University of Oviedo in Spain and his colleagues now suggest that jellyfishes are just as effective at mealtime as fishes when judged by the right measures. "Jellyfishes are ancient organisms, which use a primitive predation mechanism based on generating feeding currents to bring the prey into contact with their bodies," Acuña explains. "In spite of this primitivism, jellies are as effective as fishes in catching prey and in transforming the energy acquired (into) body growth and reproduction."
To read the full, original article click on this link: Jellyfishes Shown to Be Effective Predators: Scientific American
Author:David Biello
