Yep. The kelp forests in California have been devastated in the last few years, due to "sea star wasting disease". The sea-star population crashes, sea stars ar

Yep. The kelp forests in California have been devastated in the last few years, due to "sea star wasting disease". The sea-star population crashes, sea stars are a no longer a major predator of purple sea urchins, sea urchins like to eat the "holdfast" where the kelp attaches to the seafloor, and boom, no more kelp forests. The resulting denuded landscape (seascape?) is known as an "urchin barren". Instead of a lush underwater forest teeming with crabs, snails, and fish, you have mostly bare rocks and urchins. The ocean truly is a system.