How otters, urchins and kelp help to gauge the fragility of ecosystems
mana5280 on Unsplash
But not all urchins are equal to the otters, which zone in on the healthy nutritious ones and leave others behind.
Joshua Smith, a graduate student of the University of California, Santa Cruz (UCSC), started investigating the kelp forests in 2014. He wanted to know why patches of kelp were able to survive on the seafloor alongside completely barren areas covered in purple sea urchins.
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