The sea cucumber, an apparently sedentary creature, is anything but
It puffs itself up with water and behaves like marine tumbleweed
SEA CUCUMBERS, soft-bodied relatives of sea urchins and starfish, are a sought-after foodstuff. In China alone the market for their flesh is worth $3bn a year. Unfortunately for those who try to make a living catching them, their populations often seem to undergo a cycle of boom and bust.
Annie Mercier of the Memorial University of Newfoundland, in Canada, was curious to know why this is. In particular, she wondered whether over-harvesting was to blame, or if the animals were simply migrating away. As she reports in the Journal of Animal Ecology, they not only migrate, they do so by adopting a second vegetable-like guise—that of tumbleweeds.
This article appeared in the Science & technology section of the print edition under the headline "Cool cucumbers"
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