Researchers tethered 50 long-spined and 50 short-spined urchins outside lobster den and sharks were observed ‘smashing the whole thing’
An experiment designed to investigate lobster predation on sea urchins unexpectedly found that Port Jackson and crested horn sharks ate the spiky animals instead.
“We expected that would result in higher rates of predation by lobsters, but it’s not what we found,” he said., was designed to test the assumption that lobsters played a key role in regulating sea urchin numbers. The results highlighted the significance of overlooked predators – like sharks.Over 25 nights in the spring of 2023, researchers tethered 50 long-spined and 50 short-spined urchins outside the den, as underwater cameras captured the urchins’ fate.
An estimated 20m to 30m sea urchins in Tasmania waters ate kelp and created bare rock barrens that threatened local ecosystems as well as recreational and commercial fisheries, impacts that were the focus of a
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